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WO2018180020A1 - Procédé et dispositif de fabrication de batterie secondaire - Google Patents

Procédé et dispositif de fabrication de batterie secondaire Download PDF

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Publication number
WO2018180020A1
WO2018180020A1 PCT/JP2018/005989 JP2018005989W WO2018180020A1 WO 2018180020 A1 WO2018180020 A1 WO 2018180020A1 JP 2018005989 W JP2018005989 W JP 2018005989W WO 2018180020 A1 WO2018180020 A1 WO 2018180020A1
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Prior art keywords
electrode
coating
metal sheet
material layer
shape
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PCT/JP2018/005989
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English (en)
Japanese (ja)
Inventor
烈 田原
徹 川合
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株式会社村田製作所
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Publication of WO2018180020A1 publication Critical patent/WO2018180020A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a method and an apparatus for manufacturing a secondary battery.
  • the present invention relates to a method and an apparatus for manufacturing a secondary battery characterized by the production of at least one of a positive electrode and a negative electrode.
  • Secondary batteries which are so-called “storage batteries”, can be repeatedly charged and discharged, and are used in various applications.
  • secondary batteries are used in mobile devices such as mobile phones, smartphones, and notebook computers.
  • the secondary battery is composed of at least a positive electrode, a negative electrode, and a separator between them.
  • the positive electrode is composed of a positive electrode material layer and a positive electrode current collector
  • the negative electrode is composed of a negative electrode material layer and a negative electrode current collector.
  • the electrode material layer forming raw material is applied from a die head onto a metal sheet material to be an electrode current collector, an electrode material layer is formed to obtain an electrode precursor, and then the electrode A plurality of electrodes are obtained by cutting out from the precursor.
  • the following methods are known from the viewpoint of mass production of electrodes: (1) As shown in FIG. 12A, a method of continuously applying the electrode material layer forming raw material 520 from one die head 501 on the moving metal sheet material 510; and (2) As shown in FIG. 12B, A method of intermittently applying an electrode material layer forming raw material 520 from one die head 501 on a moving metal sheet material 510.
  • a method using two or more die heads is also known as shown below: (3) As shown in FIG. 12C, the electrode material layer forming raw materials 520a and 520b are continuously applied in the same coating shape from each of the two or more die heads 501a and 501b on the moving metal sheet material 510. (4) As shown in FIG. 12D, the electrode material layer forming raw materials 520a and 520b are the same from the two or more die heads 501a and 501b on the moving metal sheet material 510 as shown in FIG. 12D.
  • the method of intermittently applying the coating shape. 12A to 12D are plan views schematically showing one embodiment of the electrode material layer forming raw material coating process in the prior art.
  • the inventors of the present application have found that there is a problem to be overcome in the conventional method for manufacturing a secondary battery, and have found that it is necessary to take measures for that. Specifically, the present inventors have found that there are the following problems when producing a non-rectangular electrode different from the rectangular shape.
  • a rectangular shape can be obtained continuously or intermittently as the coating shape of the electrode material layer forming raw material.
  • the coating shape of the electrode material layer forming raw material from two or more die heads is formed by slits 560 for each die head as shown in FIGS. 12C and 12D. It is separated. For this reason, when a plurality of non-rectangular electrodes 540 such as shown in FIGS. 13A to 13D are cut out from the obtained electrode precursor 530, for example, the remainder (particularly of the electrode material layer material) discarded after cutting out. Remaining) 550 was relatively large. As a result, it has never been said that these methods have high production efficiency.
  • 13A to 13D are plan views schematically showing one embodiment of an electrode cutting process using the electrode precursor obtained in FIGS. 12A to 12D, respectively.
  • a main object of the present invention is to provide a method and an apparatus for manufacturing a secondary battery with higher manufacturing efficiency.
  • the inventor of the present application tried to solve the above-mentioned problem by addressing in a new direction rather than responding on the extension of the prior art. As a result, a secondary battery manufacturing method and a manufacturing apparatus according to the present invention have been achieved.
  • the present invention A method for manufacturing a secondary battery, comprising: Production of at least one of a positive electrode and a negative electrode Coating an electrode material layer forming raw material on a metal sheet material to be an electrode current collector from a die head to obtain an electrode precursor, and cutting out from the electrode precursor to form a plurality of electrodes. Consisting of The present invention relates to a method for manufacturing a secondary battery, which is performed by combining continuous coating and intermittent coating using two or more die heads as coating of the electrode material layer forming material.
  • the present invention also provides An apparatus for producing a secondary battery for producing a plurality of electrodes of at least one of a positive electrode and a negative electrode, Including two or more die heads for applying an electrode material layer forming raw material to a metal sheet material to be an electrode current collector, As the two or more die heads, The present invention relates to an apparatus for manufacturing a secondary battery, including at least one die head for coating by a continuous coating method; and at least one die head for coating by an intermittent coating method.
  • the manufacturing efficiency can be further increased. More specifically, when cutting out a plurality of electrodes from the electrode precursor, the “residual after cutting” can be reduced.
  • FIG. 1 It is a schematic diagram for demonstrating "non-rectangular shape" ("partially notched shape"). It is the top view which showed typically one embodiment of the electrode precursor obtained at the coating process of the electrode material layer forming raw material in the manufacturing method of the secondary battery of this invention. It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material for obtaining the electrode precursor of FIG. It is the top view which showed typically one embodiment of the electrode precursor obtained at the coating process of the electrode material layer forming raw material in the manufacturing method of the secondary battery of this invention. It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material for obtaining the electrode precursor of FIG.
  • top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material for obtaining the electrode precursor of FIG. It is the top view which showed typically one embodiment of the electrode precursor obtained at the coating process of the electrode material layer forming raw material in the manufacturing method of the secondary battery of this invention. It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material for obtaining the electrode precursor of FIG. It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material for obtaining the electrode precursor of FIG. It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material for obtaining the electrode precursor of FIG. It is the top view which showed typically one embodiment of the cutting-out process of the electrode using the electrode precursor of FIG. It is the top view which showed typically one embodiment of the cutting-out process of the electrode using the electrode precursor of FIG.
  • FIG. 12A It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material in a prior art. It is the top view which showed typically one embodiment of the coating process of the electrode material layer forming raw material in a prior art. It is the top view which showed typically one embodiment of the cutting-out process of the electrode using the electrode precursor obtained by FIG. 12A. It is the top view which showed typically one embodiment of the cutting-out process of the electrode using the electrode precursor obtained by FIG. 12B. It is the top view which showed typically one embodiment of the cutting-out process of the electrode using the electrode precursor obtained by FIG. 12C. It is the top view which showed typically one embodiment of the cutting-out process of the electrode using the electrode precursor obtained by FIG. 12D.
  • the direction of “thickness” described directly or indirectly in this specification is based on the stacking direction of the electrode material constituting the secondary battery, that is, “thickness” is in the stacking direction of the positive electrode and the negative electrode. Corresponds to the dimensions.
  • vertical direction and horizontal direction used directly or indirectly in the present specification correspond to the vertical direction and horizontal direction in the drawing, respectively.
  • the same reference numerals or symbols indicate the same members or the same meaning contents except that the shapes are different.
  • a secondary battery is obtained.
  • the “secondary battery” in the present specification refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery obtained by the manufacturing method of the present invention is not excessively bound by its name, and for example, “electric storage device” can also be included in the object.
  • the secondary battery obtained by the production method of the present invention has an electrode assembly in which electrode constituent layers including a positive electrode, a negative electrode, and a separator are laminated.
  • the positive electrode and the negative electrode are stacked via a separator to form an electrode constituent layer, and an electrode assembly in which at least one electrode constituent layer is laminated is enclosed in an outer package together with an electrolyte.
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector.
  • a positive electrode material layer is provided on at least one surface of the positive electrode current collector, and the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • each of the plurality of positive electrodes in the electrode assembly may be provided with a positive electrode material layer on both surfaces of the positive electrode current collector, or may be provided with a positive electrode material layer only on one surface of the positive electrode current collector.
  • the positive electrode is preferably provided with a positive electrode material layer on both surfaces of the positive electrode current collector.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector.
  • a negative electrode material layer is provided on at least one surface of the negative electrode current collector, and the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • each of the plurality of negative electrodes in the electrode assembly may be provided with a negative electrode material layer on both surfaces of the negative electrode current collector, or may be provided with a negative electrode material layer only on one surface of the negative electrode current collector.
  • the negative electrode is preferably provided with a negative electrode material layer on both sides of the negative electrode current collector.
  • the electrode active materials contained in the positive electrode and the negative electrode are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought into the electrolyte due to the “positive electrode active material included in the positive electrode material layer” and the “negative electrode active material included in the negative electrode material layer”, and the ions are interposed between the positive electrode and the negative electrode. Then, the electrons are transferred and the electrons are delivered and charged and discharged.
  • the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions.
  • the secondary battery obtained by the production method of the present invention corresponds to a so-called “lithium ion battery”, and the positive electrode and the negative electrode have layers capable of occluding and releasing lithium ions. .
  • the positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included in the positive electrode material layer for sufficient contact between the particles and shape retention. Furthermore, a conductive additive may be included in the positive electrode material layer in order to facilitate the transmission of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid may be included in the negative electrode material layer.
  • the positive electrode material layer and the negative electrode material layer can also be referred to as “positive electrode composite material layer” and “negative electrode composite material layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
  • the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
  • the positive electrode active material is preferably a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, in the positive electrode material layer of the secondary battery obtained by the production method of the present invention, such a lithium transition metal composite oxide is preferably contained as the positive electrode active material.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal.
  • the positive electrode active material contained in a positive electrode material layer may be lithium cobaltate.
  • the binder that can be included in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and Mention may be made of at least one selected from the group consisting of polytetrafluoroethylene and the like.
  • the conductive auxiliary agent that can be included in the positive electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • the binder of the positive electrode material layer may be polyvinylidene fluoride
  • the conductive additive of the positive electrode material layer may be carbon black.
  • the binder and conductive support agent of a positive electrode material layer may be a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like.
  • graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
  • Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
  • the negative electrode active material of a negative electrode material layer may be artificial graphite.
  • the binder that can be included in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Can be mentioned.
  • the binder contained in the negative electrode material layer may be styrene butadiene rubber.
  • the conductive auxiliary agent that can be included in the negative electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer.
  • the negative electrode active material and the binder in the negative electrode material layer may be a combination of artificial graphite and styrene butadiene rubber.
  • the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a porous or perforated form.
  • the current collector may be a metal foil, a punching metal, a net or an expanded metal.
  • the positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector used for the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
  • the separator used for the positive electrode and the negative electrode is a member provided from the viewpoint of preventing short circuit due to contact between the positive electrode and the negative electrode and maintaining the electrolyte.
  • the separator can be said to be a member that allows ions to pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member and has a film form due to its small thickness.
  • a polyolefin microporous film may be used as the separator.
  • the microporous membrane used as the separator may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin.
  • the separator may be a laminate composed of “a microporous membrane made of PE” and “a microporous membrane made of PP”.
  • the surface of the separator may be covered with an inorganic particle coat layer, an adhesive layer, or the like.
  • the surface of the separator may have adhesiveness.
  • the separator may be insulating inorganic particles having a similar function.
  • an electrode assembly including an electrode constituent layer including a positive electrode, a negative electrode, and a separator is enclosed in an outer package together with an electrolyte.
  • the electrolyte is preferably a “non-aqueous” electrolyte such as an organic electrolyte or an organic solvent (that is, the electrolyte is a non-aqueous electrolyte). preferable).
  • the electrolyte metal ions released from the electrodes (positive electrode and negative electrode) exist, and therefore, the electrolyte assists the movement of the metal ions in the battery reaction.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • a solvent containing at least carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to.
  • chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DPC dipropyl carbonate
  • the combination of cyclic carbonate and chain carbonate may be used as a non-aqueous electrolyte, for example, the mixture of ethylene carbonate and diethyl carbonate is used.
  • a Li salt such as LiPF 6 and / or LiBF 4 is preferably used as a specific nonaqueous electrolyte solute.
  • the electrolyte may be a liquid electrolyte, a solid electrolyte, a gel electrolyte, or the like.
  • the outer package encloses the electrode assembly in which the electrode constituent layers including the positive electrode, the negative electrode, and the separator are stacked, but may be in the form of a hard case or may be in the form of a soft case.
  • the exterior body may be a hard case type corresponding to a so-called “metal can” or a soft case type corresponding to a “pouch” made of a so-called laminate film.
  • the production method of the present invention is characterized by a method for producing an electrode.
  • the method is characterized in that the electrode material layer forming raw material is applied to the electrode current collector when producing at least one of the positive electrode and the negative electrode.
  • the production of at least one of the positive electrode and the negative electrode is performed by applying the electrode material layer forming raw material from the die head to the metal sheet material 10 serving as the electrode current collector.
  • the electrode material layer 20 is formed to obtain the electrode precursor 30, and as shown in FIGS. 8A, 8B, 9A, 9B, 9C, and 10, Cutting out from the electrode precursor 30 to form a plurality of electrodes 40.
  • each of the plurality of electrodes 40 is usually a non-rectangular shape.
  • 2, 4 and 6 are plan views schematically showing one embodiment of the electrode precursor obtained in the electrode material layer forming raw material coating step in the method for producing a secondary battery of the present invention.
  • 8A and 8B are plan views schematically showing one embodiment of an electrode cutting process using the electrode precursor of FIG. 9A
  • FIG. 9B, and FIG. 9C are plan views schematically showing one embodiment of an electrode cutting process using the electrode precursor of FIG.
  • FIG. 10 is a plan view schematically showing one embodiment of an electrode cutting process using the electrode precursor of FIG.
  • non-rectangular shape refers to a shape whose electrode shape in plan view is not normally included in the concept of a rectangular shape such as a square and a rectangle, and in particular, partially from such a square / rectangle. It refers to a shape that is partially missing. Accordingly, in a broad sense, “non-rectangular shape” refers to a shape in which the electrode shape in plan view as viewed from above in the thickness direction is not square or rectangular, and in a narrow sense, the electrode shape in plan view is square or rectangular. This means that the base is partly cut out (preferably the base is square or rectangular with a corner and / or non-corner (for example, the center) cut out). ing.
  • the “non-rectangular shape” is based on a square / rectangular shape of the electrode in plan view, and a square, rectangular, semi-circular, semi-elliptical, circular / It may be a shape obtained by cutting out a part of an ellipse or a combination thereof from the base shape (particularly a shape obtained by cutting out a corner portion or a non-corner portion (for example, the central portion) of the base shape). (See FIG. 1).
  • the plan view is a state when an object (for example, an electrode or an electrode precursor) is placed and viewed from directly above in the thickness (height) direction, and is in agreement with the plan view.
  • FIG. 1 an object
  • FIG. 1 is a schematic diagram for explaining a “non-rectangular shape” (“partially cutout shape”).
  • a non-rectangular shape (“partially cutout shape”).
  • FIG. 1 although the shape obtained by notching from the corner part of a base shape is shown, the shape obtained by notching from the non-corner part (for example, center part) of a base shape may be sufficient.
  • continuous coating and intermittent coating are performed using two or more die heads so that a plurality of such “non-rectangular” electrodes can be obtained efficiently.
  • the range of the whole coating shape which can be formed with the electrode material layer forming raw material on the metal sheet material 10 is expanded.
  • the cutting shape (non-rectangular shape) of the several electrode planned the whole coating shape of the electrode material layer forming raw material which can reduce the remainder after cutting can be obtained.
  • the “waste part” that is not finally used in the production of the secondary battery can be reduced (particularly, the disposal of the electrode active material can be reduced), and the production efficiency of the secondary battery becomes higher.
  • such a reduction in the “waste part” leads to low-cost manufacturing of the secondary battery.
  • the manufacturing method of the secondary battery After preparing and preparing the positive electrode, the negative electrode, the electrolytic solution, and the separator, respectively (may be procured from a commercial product if necessary), the secondary battery is integrated by combining them. Obtainable.
  • a positive electrode material layer forming raw material that is, an electrode material layer forming raw material is prepared.
  • the positive electrode material layer forming raw material may be a positive electrode material slurry.
  • the positive electrode material slurry is an electrode material layer forming raw material including at least a positive electrode active material and a binder.
  • This positive electrode material slurry is applied to a metal sheet material (for example, aluminum foil) used as a positive electrode current collector (coating process) and rolled with a roll press machine (pressing process).
  • a positive electrode precursor that is, an electrode precursor is obtained.
  • the metal sheet material preferably has a long strip shape, and the positive electrode material slurry is applied to such a long metal sheet.
  • the area to be applied is preferably not a whole area of the long metal sheet but a specific area to be described later that is not applied to the peripheral portions in the both width directions of the metal sheet material.
  • the obtained positive electrode precursor (especially a positive electrode precursor that is long in a band shape) is stored by being wound in a roll or the like as needed, or is appropriately transported until it is used in the next step.
  • cutting step is performed to obtain a plurality of positive electrodes from the positive electrode precursor (cutting step) (in the case of being wound in a roll, cutting is performed after unfolding).
  • the positive electrode precursor is cut out from the positive electrode precursor (particularly, “part where the positive electrode material slurry is applied”) by subjecting the positive electrode precursor to mechanical cutting.
  • a so-called “punching operation” may be performed.
  • an uncoated region that becomes a tab or an uncoated region larger than the tab may be left as desired.
  • the coated parts may be separated (for example, cut along m in FIG. 6).
  • the slitting process may be performed between the coating process and the pressing process.
  • a plurality of desired positive electrodes can be obtained through the operations described above.
  • the production of the negative electrode is the same as the production of the positive electrode.
  • a negative electrode material layer forming raw material that is, an electrode material layer forming raw material is prepared.
  • the negative electrode material layer forming raw material may be a negative electrode material slurry.
  • the negative electrode material slurry is an electrode material layer forming raw material including at least a negative electrode active material and a binder.
  • a negative electrode material slurry is applied to a metal sheet material (for example, copper foil) used as a negative electrode current collector (coating process) and rolled with a roll press (pressing process).
  • a negative electrode precursor that is, an electrode precursor is obtained.
  • the metal sheet material preferably has a long strip shape, and the negative electrode material slurry is applied to such a long metal sheet material.
  • the area to be applied is preferably not a whole area of the long metal sheet material but a specific area to be described later that is not applied to the peripheral portions of the metal sheet material in both width directions.
  • the obtained negative electrode precursor (particularly, a long negative electrode precursor) is stored by being rolled into a roll or the like as needed until it is used in the next step, or is appropriately transported.
  • cutting step is performed to obtain a plurality of negative electrodes from the negative electrode precursor (cutting step) (in the case of being wound in a roll, cutting is performed after unfolding).
  • the negative electrode is cut out from the negative electrode precursor (particularly, “part where the negative electrode material slurry is applied”) by subjecting the negative electrode precursor to mechanical cutting.
  • a so-called “punching operation” may be performed.
  • a plurality of desired negative electrodes can be obtained through the operations described above.
  • an uncoated region that becomes a tab or an uncoated region larger than the tab may be left as desired.
  • the coated parts may be separated (for example, cut along m in FIG. 6).
  • the slitting process may be performed between the coating process and the pressing process.
  • An electrolyte that is responsible for ion transfer between the positive electrode and the negative electrode when the battery is used is prepared (in the case of a lithium ion battery, a nonaqueous electrolyte is particularly prepared). Accordingly, a desired electrolyte is prepared by mixing such raw materials to be an electrolyte (in the production method of the present invention, the electrolyte may be a conventional electrolyte used in a conventional secondary battery, and therefore The raw materials may be those conventionally used in the production of secondary batteries.
  • the separator may be conventional, and therefore, a separator that is conventionally used as a secondary battery may be used.
  • the secondary battery can be obtained by integrally combining the positive electrode, the negative electrode, the electrolytic solution, and the separator prepared and prepared as described above.
  • a secondary battery can be obtained by stacking a plurality of positive electrodes and negative electrodes through a separator to form an electrode assembly and enclosing the electrode assembly together with an electrolyte in an exterior body.
  • the separator may be a laminate of sheets cut into sheets, or may be stacked in a ninety-nine shape and cut off excess. Furthermore, you may laminate
  • the present invention is particularly characterized in the production of the electrode for the production of the secondary battery as described above.
  • the method for producing a secondary battery of the present invention includes the following electrode material layer forming raw material coating step and electrode cutting step for the production of at least one of a positive electrode and a negative electrode. That is, the manufacturing method of the secondary battery of the present invention includes the electrode material layer forming raw material coating step and the electrode cutting step described below in the positive electrode manufacturing method and / or the negative electrode manufacturing method described below. It includes a material layer forming raw material coating step and an electrode cutting step.
  • Electrode Material Layer Forming Material Coating Process the electrode material layer forming material is applied to a single metal sheet material 10 serving as an electrode current collector from a die head. To obtain the electrode precursor 30 (FIGS. 2, 4 and 6).
  • the overall coating shape of the electrode material layer forming raw material on the metal sheet material 10 can be, for example, the following shape P in plan view, depending on the expected cutout shape (non-rectangular shape) of the electrode. .
  • Shape P As shown in FIGS. 2, 4, and 6, in a rectangular shape R having a longitudinal direction parallel to the longitudinal direction g of the metal sheet material 10, one or both ends in the direction w perpendicular to the longitudinal direction g The shape which has the uncoated area
  • the uncoated areas N are preferably aligned along the longitudinal direction g, and more preferably periodically aligned at a constant interval.
  • the shape of the uncoated area N may also be rectangular.
  • the dimension in the vertical direction w of the uncoated region N is smaller than the total length in the vertical direction w of a substantially rectangular shape R (dashed line region shape) having a longitudinal direction parallel to the longitudinal direction g of the metal sheet material 10.
  • the substantially rectangular shape R is the overall shape brought about by the outer edge of the overall coating shape (entire coating region) of the electrode material layer forming raw material on the metal sheet material 10.
  • Such a shape P include, for example, the following shapes p1 to p3.
  • Shape p1 As shown in FIG. 2, in a substantially rectangular shape R (dashed line region shape) having a longitudinal direction parallel to the longitudinal direction g of the metal sheet material 10, at one end in a direction w perpendicular to the longitudinal direction g The shape which has the uncoated area
  • the shape p1 is a comb shape as shown in FIG.
  • the comb-tooth shape is a shape in which “narrow portions 11” and “wide portions 12” are alternately continued in the longitudinal direction g, and the width is increased or decreased only by one end in the vertical direction w. It is.
  • This shape is also called a one-side comb shape.
  • the width is the length of the entire coating shape in the direction w perpendicular to the longitudinal direction g of the metal sheet material 10.
  • the “narrow portion 11” means a local portion of the overall shape of the coating in which the width dimension is relatively reduced in plan view, while the “wide portion 12” has a relatively width dimension in plan view. It means the local part of the increased overall coating shape.
  • the comb-teeth shape as the entire coating shape is not constant in width, and has a locally reduced form or a locally increased form.
  • the plurality of “narrow portions 11” have substantially the same shape and the same size, and similarly, the plurality of “wide portions 12” have substantially the same shape and the same size. It has become.
  • the overall shape of the coating is preferably such that the width dimension is periodically reduced or increased.
  • the “entire coating shape” mainly means the entire coating shape of the electrode material layer forming raw material on the metal sheet material 10.
  • Shape p2 As shown in FIG. 4, in a substantially rectangular shape R (dashed line region shape) having a longitudinal direction parallel to the longitudinal direction g of the metal sheet material 10, it is not formed in a substantially central portion in the direction w perpendicular to the longitudinal direction g.
  • the shape p2 is a ladder shape as shown in FIG.
  • the ladder shape is a shape in which the width is substantially constant in the longitudinal direction g, but the “uncoated region-containing portion 13” and the “uncoated region-free portion 14” are alternately continued.
  • the width is the length of the entire coating shape in the direction w perpendicular to the longitudinal direction g of the metal sheet material 10.
  • the “uncoated region-containing portion 13” means a local portion of the entire coating shape including the uncoated region N in the width direction in plan view, while the “uncoated region-free portion 14”. Means a local part of the entire coating shape that does not include the uncoated region N in the width direction in plan view.
  • the ladder shape as the entire coating shape has a constant width dimension, but has a form in which an uncoated area N exists locally or a form in which no uncoated area exists.
  • the plurality of “uncoated region-containing portions 13” have substantially the same shape and substantially the same size, and the plurality of “uncoated region-free portions 14” are similarly formed. They have substantially the same shape and size. In other words, it can be said that it is preferable that the entire coating shape has or does not exist periodically in the longitudinal direction g. In the “uncoated region-containing portion 13” of FIG.
  • the uncoated region N is disposed at a substantially central portion in the width direction w, but unless the region is disposed at an end portion in the width direction w. Is not particularly limited.
  • the ladder shape preferably has line symmetry about the center line m having a width dimension parallel to the longitudinal direction g.
  • Shape p3 As shown in FIG. 6, in a substantially rectangular shape R (dashed line region shape) having a longitudinal direction parallel to the longitudinal direction g of the metal sheet material 10, both ends in the direction w perpendicular to the longitudinal direction g The shape which has the uncoated area
  • the shape p3 is an antenna shape as shown in FIG.
  • the antenna shape is a shape in which the “narrow portion 15” and the “wide portion 16” are alternately continued in the longitudinal direction g, and the increase or decrease in the width is provided by both ends in the vertical direction w. .
  • This shape is also called a double-sided comb shape.
  • the width is the length of the entire coating shape in the direction w perpendicular to the longitudinal direction g of the metal sheet material 10.
  • the “narrow portion 15” means a local portion of the entire coating shape in which the width dimension is relatively reduced in plan view, while the “wide portion 16” has a relatively width dimension in plan view. It means the local part of the increased overall coating shape.
  • the antenna shape as the entire coating shape is not constant in width, and has a locally reduced form or a locally increased form.
  • the plurality of “narrow portions 15” have substantially the same shape and the same size
  • the plurality of “wide portions 16” have substantially the same shape and the same size. It has become.
  • the overall shape of the coating is preferably such that the width dimension is periodically reduced or increased.
  • the antenna shape preferably has line symmetry about the center line m having a width parallel to the longitudinal direction g.
  • two or more die heads are used in combination with continuous coating and intermittent coating, whereby the entire coating shape of the electrode material layer forming raw material can be formed.
  • coating is performed using at least one die head that performs coating by a continuous coating method and at least one die head that performs coating by an intermittent coating method.
  • the number of die heads for each coating method is 1 or more and is usually 1 or more and 3 or less, particularly 1 or more and 2 or less.
  • One line is one line extending in the longitudinal direction g, with one unit continuous in the width direction (vertical direction) w as one unit.
  • One strip (streak) extending in the longitudinal direction g is usually continuous. For example, FIG. 2, FIG. 4 and FIG.
  • the total number of die heads used is the total shape of one coating (that is, the number of die heads required per one total coating shape) and the width dimension (vertical direction w) of the metal sheet material (that is, 1
  • the number of strips in the overall shape of the coating formed on two metal sheet materials is determined as appropriate. For example, when a metal sheet material having a general width dimension (for example, 700 mm) is used, and the entire coating shape of the coating method as shown in FIG.
  • the number of die heads that perform coating by the continuous coating method is six, and the number of die heads that perform coating by the intermittent coating method is three.
  • the number of die heads to be coated by the continuous coating method is three
  • the number of die heads to be coated by the intermittent coating method is six. Therefore, in general, in the present invention, the number of die heads to be coated by the continuous coating method is at least one, particularly 1 to 6 and the number of die heads to be coated by the intermittent coating method is At least one, in particular one or more and six or less.
  • the two or more die heads are used to perform continuous coating and intermittent coating in combination, the range of the entire coating shape that can be formed on the metal sheet material 10 from the electrode material layer forming raw material Spread.
  • the entire coating shape of the electrode material layer forming raw material that can reduce the remaining cutout is formed, so that the remaining discarded after cutting Can be reduced.
  • coating is performed by discharging an electrode material layer forming raw material from a fixed die head onto a moving metal sheet material.
  • an electrode material layer is formed on a fixed metal sheet material from a moving die head. Coating may be performed by discharging the raw material. That is, the electrode material layer forming raw material may be applied while relatively moving at least one of the metal sheet material and the die head in the longitudinal direction of the metal sheet material.
  • the continuous coating means that the coating is performed continuously.
  • the electrode material layer forming raw material is continuously applied from one die head 1, and as a result, the coating is performed in the longitudinal direction. to continue with g.
  • the coating shape of the electrode material layer forming raw material obtained on the metal sheet material 10 by continuous coating is a relatively long rectangular shape R1 formed continuously in the longitudinal direction g of the metal sheet material 10.
  • FIG. 3 is a plan view schematically showing one embodiment of an electrode material layer forming raw material coating step for obtaining the electrode precursor of FIG.
  • Intermittent coating means that coating is performed intermittently or intermittently.
  • the electrode material layer forming raw material is applied from one die head 2, and then stopped. It is to repeat the work to do.
  • the coating shape and coating pitch in the coating region (R2) are usually constant.
  • the coating shape of the electrode material layer forming raw material obtained on the metal sheet material 10 by intermittent coating is a plurality of rectangular shapes R2 formed at intervals in the longitudinal direction g of the metal sheet material 10.
  • One rectangular shape R2 obtained by intermittent coating has a shorter length in the longitudinal direction g of the metal sheet material 10 than the rectangular shape R1 obtained by continuous coating.
  • the overall coating shape of the electrode material layer forming raw material shown in FIG. 2 is obtained by, for example, coating using one die head 1 that performs continuous coating and one die head 2 that performs intermittent coating, as shown in FIG. Obtainable.
  • the overall coating shape of the electrode material layer forming raw material shown in FIG. 4 is, for example, a coating using two die heads 1a and 1b that perform continuous coating and one die head 2 that performs intermittent coating, as shown in FIG. 5A. It can be obtained by work. In this way, using three or more die heads 1a, 1b, 2 and, among the three or more die heads, two or more die heads 1a, which are not adjacent to each other in the direction w perpendicular to the longitudinal direction g of the metal sheet material 10, When 1b employs the same coating method (continuous coating method or intermittent coating method), the die heads 1a and 1b can be shared as one die head 1c as shown in FIG. 5B.
  • the common die head 1c usually has a shim inserted into the die head 1c.
  • the common die head 1c has not only the width corresponding to the individual die heads 1a and 1b before commonality, but also the width corresponding to the uncommon die head 2 (uncommon die head) between them.
  • the shim is a member that guides the electrode material layer forming raw material only where the individual die heads 1a and 1b to be shared should guide the electrode material layer forming raw material, and to the place where the non-common die head 2 should guide.
  • the electrode material layer forming raw material is not induced.
  • the induction and coating of the electrode material layer forming raw material by the common die head 1c are synchronized with each other where the individual die heads 1a and 1b should guide the electrode material layer forming raw material.
  • FIG. 5A and FIG. 5B are plan views schematically showing one embodiment of the electrode material layer forming raw material coating step for obtaining the electrode precursor of FIG.
  • the overall coating shape of the electrode material layer forming raw material shown in FIG. 6 is, for example, as shown in FIG. 7A, using one die head 1 that performs continuous coating and two die heads 2a and 2b that perform intermittent coating. It can be obtained by work.
  • three or more die heads 1, 2 a, 2 b, of the three or more die heads two or more die heads 2 a that are not adjacent to each other in the direction w perpendicular to the longitudinal direction g of the metal sheet material 10.
  • the die heads 2a and 2b can be shared as one die head 2c as shown in FIG. 7B.
  • the common die head 2c usually has a shim inserted into the die head 2c.
  • the common die head 2c has not only the width corresponding to the individual die heads 2a and 2b before commonality but also the width corresponding to the die head 1 (uncommon die head) that is not common between them.
  • the shim is a member that guides the electrode material layer forming raw material only to where the individual die heads 2a and 2b to be shared should guide the electrode material layer forming raw material, and to the place where the non-common die head 1 should guide.
  • the electrode material layer forming raw material is not induced.
  • the induction and coating of the electrode material layer forming raw material by the common die head 2c to the place where the individual die heads 2a and 2b should guide the electrode material layer forming raw material are synchronized.
  • FIG. 7A and FIG. 7B are plan views schematically showing one embodiment of the electrode material layer forming raw material coating step for obtaining the electrode precursor of FIG.
  • the electrode material layer forming raw material from each of two die heads adjacent to each other in the direction w perpendicular to the longitudinal direction g of the metal sheet material 10 is a metal sheet. They are in contact with each other on the material 10. That is, of the two or more die heads, the two adjacent die heads are arranged such that the electrode material layer forming raw material from each die head is in contact with each other on the metal sheet material 10.
  • the two die heads adjacent to each other in the vertical direction w mean two die heads that provide coating areas adjacent in the vertical direction w on the metal sheet material 10.
  • the coating shape of the electrode material layer forming raw material from each die head can constitute a part of the cutout shape of the electrode, the entire coating that can be formed by the electrode material layer forming raw material on the metal sheet material Wide range of shapes.
  • the cutout shape of the electrode it is possible to obtain the overall shape of the electrode material layer forming raw material that can reduce the remaining cutout, and therefore, the remaining discarded after cutting can be reduced.
  • the electrode material layer forming raw materials that are in contact with each other on the metal sheet material 10 are shown in FIG. 3, FIG. 5A, FIG. 5B, FIG. 7A, and FIG. As shown, the metal sheet material 10 is preferably in contact with each other in the direction w perpendicular to the longitudinal direction g.
  • one coating region R1 derived from the die head 1 and all coating regions R2 derived from the die head 2 are in contact with each other in the vertical direction w on the metal sheet material 10.
  • the two coating regions R1a and R1b derived from the die heads 1a and 1b and all the coating regions R2 derived from the die head 2 are in contact with each other in the vertical direction w on the metal sheet material 10. Yes.
  • the two coating regions R1c derived from the die head 1c and all the coating regions R2 derived from the die head 2 are in contact with each other in the vertical direction w on the metal sheet material 10.
  • one coating region R1 derived from the die head 1 and all coating regions R2a and R2b derived from the die heads 2a and 2b are in contact with each other in the vertical direction w on the metal sheet material 10. Yes.
  • one coating region R1 derived from the die head 1 and all the coating regions R2c derived from the die head 2c are in contact with each other in the vertical direction w on the metal sheet material 10.
  • one coating is preferably performed on the upstream side in the longitudinal direction g of the metal sheet material 10 than the other coating. That is, the two adjacent die heads are preferably arranged so that one die head is positioned upstream of the other die head in the longitudinal direction g of the metal sheet material 10.
  • the position of the die head that performs the other coating can be adjusted with reference to the coating area by the one coating, and as a result, the coating area by the one coating and the coating by the other coating can be adjusted.
  • the two or more die heads used in this step are not aligned in the vertical direction w with respect to the longitudinal direction g of the metal sheet material 10, that is, not aligned in a line.
  • the one coating and the other coating are preferably performed by a wet-wet method.
  • the wet-wet method is a method in which the other coating is performed without performing drying after coating one of the two adjacent die heads. With the wet-wet method, the contact between the coating area by the one coating and the coating area by the other coating can be achieved with sufficient accuracy, and the thickness change at these boundaries can be further reduced.
  • the drying history of the electrode material layer in one electrode is the same for the portion by the one coating and the portion by the other coating.
  • the same one type of electrode material layer forming slurry as described later as the electrode material layer forming raw material applied from all the die heads.
  • the electrode material layer forming raw material applied from all the die heads may be the same, or a part or all of them may be different from each other, but are preferably the same.
  • at least one type of electrode material layer forming slurry may be used as the electrode material layer forming raw material applied from all the die heads in this step, and preferably one type of electrode material layer forming slurry is used.
  • the application of the electrode material layer forming raw material in this step may be performed on one side of the metal sheet material 10 or may be performed on both sides.
  • the overall coating shape (coating pattern) obtained by the coating is usually the same on both surfaces.
  • the overall shape of the coating obtained by coating is the same on both sides.
  • the entire coating of the one side is applied from one side through the metal sheet material 10.
  • the coating may be performed on both surfaces simultaneously, or after coating on one surface, on the other surface Coating may be performed. In the latter case, it is preferable to perform coating on the other surface after drying on one surface and then drying. From the viewpoint of homogenizing the dry state of the electrode material layer, it is preferable to apply the electrode material layer forming raw material simultaneously on both surfaces of the metal sheet material 10.
  • the above-described coating process of the electrode material layer forming raw material may be performed on both surfaces.
  • the above-described electrode material layer forming raw material coating step using two or more die heads arranged symmetrically so as to face each other with the metal sheet material 10 interposed therebetween May be performed.
  • drying is usually performed before cutting out the next electrode.
  • the drying method is not particularly limited, and may be a heat drying method or a natural drying method.
  • the electrode cutting- out step a plurality of electrodes are cut out from the electrode precursor 30 obtained in the above-described coating step.
  • the cutting method is not particularly limited as long as an electrode having a desired shape is obtained.
  • the cutting method may be a punching operation method.
  • the cut-out shape of each of the plurality of electrodes is usually a non-rectangular shape. That is, the cutting is performed so as to obtain a plurality of non-rectangular electrodes.
  • non-rectangular shape includes shapes other than the rectangular shape such as a square and a rectangle as described above. Specifically, for example, an L shape, a T shape, an O shape, a C shape, for example. (Including a U shape), an H shape (including an I shape), a cross shape, and a composite shape thereof. As long as these non-rectangular electrodes can be efficiently cut out, any non-rectangular electrodes known in the field of secondary battery shape in plan view can be efficiently combined by combining these character shapes. It can be considered that it can be cut out.
  • the electrode precursor 30 having a comb-teeth shape (one-side comb-teeth shape) as shown in FIG.
  • the electrode 40 having an L shape or a T shape can be cut out.
  • the electrode precursor 30 in which the overall coating shape of the electrode material layer forming raw material is a ladder shape as shown in FIG. 4, as shown in FIGS. 9A, 9B and 9C, as shown in FIGS.
  • the electrode 40 having a shape, a C shape, or an H shape can be cut out.
  • the electrode precursor 30 in which the overall coating shape of the electrode material layer forming raw material is an antenna shape (bilateral comb-tooth shape) as shown in FIG. 6, as shown in FIG. Can be cut out.
  • the metal sheet of the electrode material layer forming raw material from each of the two or more die heads in the coating step The plurality of electrodes are cut out so that the coating shapes on the material 10 are combined with each other in plan view to form the cutout shape of the electrodes.
  • the coating shape by the two or more die heads is separated by a slit 560 for each die head, as shown in FIGS. 13C and 13D.
  • the cut-out shapes of the plurality of electrodes are the same. That is, the electrode precursor is cut out so as to obtain a plurality of the same “non-rectangular shape” (40).
  • the positive electrode precursor is cut out so that the cut-out shapes of the plurality of positive electrodes are the same non-rectangular shape.
  • the negative electrode precursor is cut out so that the cut-out shapes of the plurality of negative electrodes are the same non-rectangular shape.
  • the shape between the positive electrode and the negative electrode is not necessarily the same as each other, it is preferably substantially the same shape or substantially the same shape when used for manufacturing the same secondary battery.
  • the positive electrode and the negative electrode incorporated in the secondary battery are generally slightly larger in negative electrode size. In that respect, the shape of the positive electrode and the shape of the negative electrode are flat. It is preferable that they are similar to each other in view).
  • each of the plurality of electrodes it is preferable to cut out each of the plurality of electrodes so that the current collector tab portion is included.
  • the metal sheet material 10 in which no electrode material layer is provided is cut out so that the region is included in the cut shape, thereby collecting current in each of the plurality of electrodes 40.
  • a body tab 45 is preferably provided.
  • the position of the current collector tab portion is positioned at the same location in the cutout shape between the plurality of electrodes. That is, in the case of manufacturing the positive electrode, it is preferable that the position of the positive electrode current collector tab portion (so-called “positive electrode tab”) is made to be the same in the cut-out shape between the plurality of positive electrodes.
  • the position of the negative electrode current collector tab portion is made to be the same in the cut-out shape between the plurality of negative electrodes.
  • the current collector tab portion 45 is cut out so as to be positioned on the same non-rectangular side between the plurality of electrodes 40.
  • the current collector tab portion 45 is formed of the metal sheet. It is preferable that the cutting is performed in a form protruding in the short direction of the material 10 (that is, the short direction of the electrode precursor 30). In FIG. 11, a broken line shows a cut line.
  • the secondary battery manufacturing method of the present invention may include a pressing step and a slit step between the electrode material layer forming raw material coating step and the electrode cutting step.
  • a press process is a process of adjusting the thickness of the electrode material layer in an electrode precursor, for example, is rolled with a roll press machine.
  • a slit process is a process of cutting off both ends (uncoated part) of the width direction in an electrode precursor, for example, a cutting processing machine (slitter) is used.
  • slitter a cutting processing machine
  • the coated parts may be separated (for example, cut along m in FIG. 6).
  • about the execution order of a press process and a slit process although a slit process is normally performed after a press process, this reverse order may be sufficient.
  • the secondary battery obtained by the production method of the present invention can be used in various fields where power storage is assumed.
  • secondary batteries are used in the electrical / information / communication field where mobile devices are used (for example, mobile phones, smart watches, smartphones, laptop computers, digital cameras, activity meters, arm computers and electronic devices).
  • Paper and other mobile devices home / small industrial applications (eg, power tools, golf carts, home / care / industrial robots), large industrial applications (eg, forklifts, elevators, bay harbor cranes) ), Transportation systems (for example, hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles, etc.), power system applications (for example, various power generation, road conditioners, smart grids, general home-installed energy storage systems) Field), IoT field, and space / Sea applications (for example, spacecraft, areas such as submersible research vessel) can be used, such as in.
  • home / small industrial applications eg, power tools, golf carts, home / care / industrial robots
  • large industrial applications eg, forklifts, elevators, bay harbor cranes
  • Transportation systems for example, hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles, etc.
  • power system applications for example, various power generation, road conditioners, smart grids, general home-installed energy storage systems

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Abstract

La présente invention concerne un procédé de fabrication de batterie secondaire d'une efficacité de production supérieure. La présente invention concerne un procédé de fabrication de batterie secondaire selon lequel la fabrication d'au moins une électrode positive et d'une électrode négative comprend : l'obtention d'un précurseur d'électrode par revêtement d'un matériau en feuille métallique (10) servant de collecteur de courant d'électrode avec un matériau de départ de formation de couche de matériau d'électrode à partir de têtes d'extrusion ; et la formation d'une pluralité d'électrodes par découpe desdites électrodes à l'extérieur du précurseur d'électrode. Le revêtement avec le matériau de départ de formation de couche de matériau d'électrode est effectué en utilisant au moins deux têtes d'extrusion (1a, 1b) pour réaliser une combinaison de revêtement continu et de revêtement intermittent.
PCT/JP2018/005989 2017-03-29 2018-02-20 Procédé et dispositif de fabrication de batterie secondaire WO2018180020A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020149921A (ja) * 2019-03-15 2020-09-17 Tdk株式会社 非水電解質二次電池用負極及びこれを用いた非水電解質二次電池
CN116352290A (zh) * 2023-05-10 2023-06-30 宁德时代新能源科技股份有限公司 极耳模切方法及模切装置

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JP2014096315A (ja) * 2012-11-12 2014-05-22 Toyota Industries Corp 電極の製造方法

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JPH1176901A (ja) * 1997-09-05 1999-03-23 Toshiba Mach Co Ltd コーティング装置
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020149921A (ja) * 2019-03-15 2020-09-17 Tdk株式会社 非水電解質二次電池用負極及びこれを用いた非水電解質二次電池
CN116352290A (zh) * 2023-05-10 2023-06-30 宁德时代新能源科技股份有限公司 极耳模切方法及模切装置
CN116352290B (zh) * 2023-05-10 2023-10-20 宁德时代新能源科技股份有限公司 极耳模切方法及模切装置

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