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WO1999031751A1 - Batterie auxiliaire au lithium et sa fabrication - Google Patents

Batterie auxiliaire au lithium et sa fabrication Download PDF

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Publication number
WO1999031751A1
WO1999031751A1 PCT/JP1997/004678 JP9704678W WO9931751A1 WO 1999031751 A1 WO1999031751 A1 WO 1999031751A1 JP 9704678 W JP9704678 W JP 9704678W WO 9931751 A1 WO9931751 A1 WO 9931751A1
Authority
WO
WIPO (PCT)
Prior art keywords
active material
negative electrode
separator
positive electrode
adhesive resin
Prior art date
Application number
PCT/JP1997/004678
Other languages
English (en)
Japanese (ja)
Inventor
Kouji Hamano
Hisashi Shiota
Yasuhiro Yoshida
Michio Murai
Takayuki Inuzuka
Shigeru Aihara
Syo Shiraga
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP1997/004678 priority Critical patent/WO1999031751A1/fr
Publication of WO1999031751A1 publication Critical patent/WO1999031751A1/fr

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Classifications

    • 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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/04—Cells with aqueous electrolyte
    • H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
    • H01M6/10—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00—Primary cells; Manufacture thereof
    • H01M6/40—Printed batteries, e.g. thin film 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
    • 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

Definitions

  • the present invention relates to a lithium ion secondary battery in which a positive electrode and a negative electrode face each other with a separator holding an electrolyte therebetween.
  • TECHNICAL FIELD The present invention relates to a battery structure which does not require an external metal can and can take any form such as a thin shape, and a manufacturing method for forming the structure. Height
  • the lithium-ion battery is the secondary battery that can realize the highest voltage, the highest energy density and the highest load among the existing batteries, and its improvement is being actively promoted even today.
  • This lithium ion secondary battery has, as its main components, a positive electrode, a negative electrode, and an ion conductive layer sandwiched between both electrodes.
  • an active material powder such as a lithium-cobalt composite oxide is mixed with an electron conductor powder and a binder-resin 5 for a positive electrode and applied to an aluminum current collector.
  • a carbon-based active material powder is mixed with a binder resin and applied to the copper current collector for the negative electrode.
  • a plate shape is used.
  • a porous film made of polyethylene or polypropylene filled with a non-aqueous solvent containing lithium ions is used.
  • FIG. 9 is a schematic sectional view showing the structure of a conventional cylindrical lithium ion secondary battery disclosed in Japanese Patent Application Laid-Open No. 8-83608.
  • 1 is an outer can made of stainless steel or the like also serving as a negative electrode terminal
  • 2 is an electrode body housed in the outer can 1
  • 2 is a separator 5 disposed between the positive electrode 3 and the negative electrode 4.
  • the electrode stack is spirally wound.
  • the electrode assembly 2 needs to apply external pressure to the electrode assembly 2 in order to maintain electrical connection between the positive electrode 3, the separator 4, and the negative electrode 5. Therefore, the electrode body 2 is placed in the strong outer can 1 and pressurized to maintain contact between the above-described surfaces.
  • prismatic batteries a method has been used in which rectangular strips of electrode stacks are bundled and placed in a square metal can to apply force from the outside to hold them down.
  • a method of using a strong outer can made of metal or the like is used as a method of bringing the positive electrode and the negative electrode into close contact. Without an outer can, the surfaces of the electrode stack will peel off, making it difficult to maintain electrical connection and deteriorating battery characteristics.
  • the weight and volume of the outer can occupying the entire battery not only lowers the energy density of the battery itself, but also limits the shape of the battery due to the rigidity of the outer can itself. Difficult to do.
  • Japanese Patent Application Laid-Open No. 5-159802 discloses a manufacturing method in which an ion-conductive solid electrolyte layer and a positive electrode and a negative electrode are integrated by heating using a thermoplastic resin binder. ing. In this case, the electrodes are brought into close contact by integrating the positive electrode and the negative electrode with the solid electrolyte layer, so that the electrical connection between the positive electrode, the negative electrode and the solid electrolyte layer is maintained without applying external force. Operates as a battery.
  • the positive electrode and the negative electrode and the solid electrolyte are joined with a binder, but the interface between the positive electrode and the negative electrode and the solid electrolyte is bound. Since it is covered with an agent, it is disadvantageous in terms of ionic conductivity as compared with, for example, the case where a liquid electrolyte is used. Even if a binder having ionic conductivity is used, a material having an ionic conductivity equal to or higher than that of the liquid electrolyte has not been generally found, and the same level of the battery using the liquid electrolyte has been found. There were problems such as difficulty in obtaining battery performance. W
  • the present invention has been made as a result of intensive studies on a preferable bonding method between the separator and the positive electrode and the negative electrode in order to solve such a problem, and even without using a strong outer can.
  • the positive electrode and negative electrode can be brought into close contact with the separator 5 without increasing the ion conduction resistance between the positive electrode and the negative electrode, enabling higher energy density, thinner, and multi-layered configurations of any form.
  • An object of the present invention is to provide a compact and stable lithium ion secondary battery having excellent charge / discharge characteristics and a large battery capacity, and a method for manufacturing the same.
  • the first configuration of the lithium ion secondary battery according to the present invention includes a positive electrode in which a positive electrode active material layer is joined to a positive electrode current collector, a negative electrode in which a negative electrode active material layer is joined to a negative electrode current collector, A plurality of electrode laminates each having a surface facing the surface of the layer and having a separator for holding an electrolyte containing lithium ions; The protrusions and recesses formed on the surface of the layer, and the protrusions formed by joining each of the facing surfaces and the surface of each of the active material layers adjacent to the facing surfaces with an adhesive resin layer. A void having a predetermined depth formed by the joint surface of the portion and the recess, and an electrolyte containing lithium ions held in the void and zero.
  • the adhesion between the positive electrode and the negative electrode active material layer and the separator can be ensured by the joint surface of the convex portion, and the electrolytic solution held in the gap formed by the joint surface of the convex portion and the concave portion allows Good ion conductivity between the positive and negative electrode active material layers and the separator can be ensured, so that high energy consumption is achieved.
  • the following battery is obtained.
  • due to the multilayered electrode stack In addition, a stable, lightweight, compact battery with a large battery capacity can be obtained.
  • the depth of the gap is set to 30 m or less.
  • a third configuration of the lithium ion secondary battery according to the present invention is the lithium ion secondary battery according to the first configuration, wherein an area of a bonding surface between the respective surfaces is 10 to 30% of a total area of the respective opposing surfaces. is there.
  • the bonding strength between the separator and the positive electrode and the negative electrode active material layer is respectively equal to the positive electrode current collector and the positive electrode active material layer. And a bonding strength equal to or higher than the bonding strength between the negative electrode current collector and the negative electrode active material layer.
  • the adhesive resin layer is made porous.
  • the ion conduction resistance between the positive electrode and the negative electrode can be further reduced.
  • a void to which the adhesive resin layer is not attached is formed. Thereby, a further increase in ion conduction resistance can be suppressed.
  • a seventh configuration of the lithium ion secondary battery according to the present invention in the first configuration, a plurality of layers of the electrode laminate are configured such that a positive electrode and a negative electrode are alternately arranged between a plurality of separated separators. It is formed by this.
  • An eighth configuration of the lithium ion secondary battery according to the present invention is the lithium ion secondary battery according to the first configuration, wherein the plurality of layers of the electrode laminate are configured such that the positive electrode and the negative electrode are alternately arranged during the separated separation.
  • the ninth configuration of the lithium ion secondary battery according to the present invention is the ninth configuration according to the first configuration, wherein a plurality of layers of the electrode laminate are configured such that a positive electrode and a negative electrode are alternately arranged in a folded separator. It was formed.
  • the method for manufacturing a lithium ion secondary battery according to the present invention includes a method of manufacturing a lithium ion secondary battery, comprising: a convex portion and a concave portion on at least two surfaces of one surface of a positive electrode active material layer, one surface of a negative electrode active material layer, and two opposite surfaces of a separator. Forming an adhesive resin layer on at least two surfaces of one surface of the positive electrode active material layer, one surface of the negative electrode active material layer, and two opposing surfaces of the separator.
  • One surface of the positive electrode active material layer and one surface of the negative electrode active material layer are bonded to each surface of the separator and press-bonded, and a bonding surface formed by the convex portion and a predetermined depth formed by the concave portion. And a step of forming a plurality of layers of the electrode laminate having the above voids.
  • FIGS. 1, 2, and 3 are schematic cross-sectional views each showing a battery structure of an embodiment of the lithium ion secondary battery of the present invention
  • FIG. 4 is a sectional view showing an embodiment of the present invention
  • FIG. 5 is a schematic cross-sectional view showing an electrode laminate constituting such a battery
  • FIG. 5 is an explanatory diagram showing a method of applying an adhesive resin liquid using a roll having micropores according to one embodiment of the present invention.
  • FIG. 6 is an explanatory view showing a method of applying an adhesive resin liquid by screen printing according to one embodiment of the present invention
  • FIG. 7 is a diagram illustrating an adhesion between a spray gun and a screen according to one embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional views each showing a battery structure of an embodiment of the lithium ion secondary battery of the present invention
  • FIG. 4 is a sectional view showing an embodiment of the present invention.
  • FIG. 5 is a schematic cross-sectional view showing an electrode laminate constituting
  • FIG. 8 is an explanatory view showing a method of applying an adhesive resin liquid
  • FIG. 8 is an explanatory view showing a method of applying an adhesive resin liquid by a dispenser according to an embodiment of the present invention
  • FIG. FIG. 2 is a schematic cross-sectional view illustrating an example of a secondary battery.
  • FIGS. 1, 2 and 3 are schematic cross-sectional views showing the battery structure of one embodiment of the lithium ion secondary battery of the present invention
  • FIG. 1 shows a positive electrode 3, a separator 4
  • Figure 2 shows a flat laminated battery with multiple layers of electrode stacks formed by repeatedly stacking the negative electrode 5 in order
  • Fig. 3 shows a plate-shaped wound type laminated battery body in which a plurality of electrode laminates are formed by laminating a plurality of negative (positive) poles therebetween.
  • a flat wound type laminated battery in which a pole is arranged, a strip-shaped negative (positive) pole is arranged on one side thereof, and the strip is wound into an elliptical shape to form a multi-layered electrode laminate. Showing body.
  • FIG. 1 shows a positive electrode 3, a separator 4
  • Figure 2 shows a flat laminated battery with multiple layers of electrode stacks formed by repeatedly stacking the negative electrode 5 in order
  • Fig. 3 shows a plate-shaped wound type laminated battery body in which
  • reference numeral 3 denotes a positive electrode obtained by bonding a positive electrode active material layer 7 to a positive electrode current collector 6
  • 5 denotes a negative electrode obtained by bonding a negative electrode active material layer 9 to a negative electrode current collector 10
  • 4 denotes a positive electrode 3 and a negative electrode.
  • 5 is a separator that holds an electrolyte containing lithium ions, and is a surface of the separator 4 that faces the two active material layers 7 and 9 and the positive electrode active material layer 7 and the negative electrode active material layer 9. Convex portions and concave portions are formed on the surface adjacent (facing) the opposing surface of Separation 4.
  • Reference numeral 1 denotes an adhesive resin layer for joining the opposing surface of the separator 4 to the surfaces of the adjacent active material layers 7 and 9, which are attached to the abutting projections to join the three members.
  • Reference numeral 12 denotes a gap having a predetermined depth L formed between the electrode (that is, the active material layers 7 and 9) and the separator 4 and formed by the joint surface 11a of the protrusion and the recess. 2 holds an electrolyte containing lithium ions.
  • the positive and negative electrode active material layers 7 and 9 are formed with concavities and convexities on opposing surfaces of the separator serving as the electrolyte layer, and the bonding surface 11 a of the convex portion is formed via the adhesive resin layer 11. Adhesion between the electrode and the separator can be ensured overnight, and peeling between the electrode and the separator can be suppressed, which was difficult with conventional batteries.
  • the active material layers 7, 9 and the separation layer 4 are bonded and adhered with an adhesive resin, and at the same time, a gap having a predetermined depth formed by the bonding surface 11a of the convex portion and the concave portion therebetween.
  • Electrodes By holding the electrolyte inside 12, good ionic conductivity at the electrode-electrolyte interface can be ensured, and ionic conduction resistance can be reduced. Electrodes (Positive electrode and negative electrode) The amount of ions entering and exiting in the active material layer inside and the moving speed and amount of ions to the opposing electrode can be reduced to about the same level as those of conventional lithium ion batteries using an outer can. It becomes possible. The electrical connection between the active material layers 7 and 9 and Separation 4 can be maintained without applying external force.
  • the battery structure Eliminates the need for an outer can, which allows the battery to be lighter and thinner, has a multilayer structure of any shape, and has excellent charge / discharge characteristics and battery performance comparable to those of batteries using conventional electrolytes. Is obtained. Further, the battery capacity can be increased according to the number of layers of the electrode laminate.
  • the concave portions and the convex portions are regularly formed on the surfaces of the positive electrode and the negative electrode active material layers 7 and 9, and the separator 4, the positive electrode and the negative electrode are formed.
  • the joining regions with the active material layers 7 and 9 are joined so that they coincide with each other on both surfaces of the separator 4. With this configuration, a strong bonding strength can be maintained even when a force acts on the bonding surface between the separator 4 and the positive electrode and negative electrode active material layers 7 and 9.
  • irregularities are formed on both the positive and negative electrode active material layers 7 and 9 and Separation 4, but irregularities may be formed only on the positive and negative electrode active material layers 7 and 9.
  • a fluororesin having concaves and convexes formed on the surface is used as a separator, and the positive and negative electrode active material layers 7 and 9 have flat surfaces without irregularities. You may.
  • the adhesive resin layer 11 is selectively formed in the joining region.
  • the adhesive resin layer 11 is applied to the entire surface of the separator 4. You may do so.
  • the adhesive resin layer 11 is to be selectively formed in the joint area, the position of the convex portion and It is necessary to match the position of the dot of the adhesive resin layer 11. In this case, however, the adhesive resin may be applied to the entire surface, so that the adhesive resin layer can be easily formed.
  • the injection of the electrolyte is performed by immersing the flat laminated battery body in the electrolyte and depressurizing the electrolyte, whereby the gas in the gap and the electrolyte are separated. This is easily achieved by substitution. After the injection, it is preferable to heat and dry the flat plate-shaped laminated battery.
  • the outer package is formed.
  • the electrolyte may be injected into the exterior body through the opening of the battery, the electrolyte may be injected into at least the gap, and finally, the opening of the exterior body may be sealed.
  • the electrolytic solution when the electrolytic solution is supplied, the back surface of the battery body and the exterior body are in close contact with each other, so that the electrolytic solution does not flow around to the back surface of the battery body, and unnecessary electrolysis that does not contribute to the electrolytic action is performed.
  • the liquid can be eliminated, and the weight of the entire battery can be reduced.
  • the depth L of the bonding surface 11 a of the convex portion and the gap 12 formed by the concave portion between the active material layers 7 and 9 and the separator 4 varies depending on the conductivity of the electrolyte, but usually, in the case of 1 0 'approximately 2 S / cm is used, 3 if 0 ⁇ M less, the active material layer 7, 9 and separators Isseki ion conduction resistance between 4 becomes sufficiently small, the liquid electrolyte type battery Since it can be used at a high load factor not inferior to that of the above, it is preferable to set it to 30 zm or less.
  • the depth L of the voids 12 is set to 10 / m or less, so that the diffusion of the reactive species proceeds more easily, so that the ionic conduction resistance can be further reduced. It is more desirable to adjust to. Further, in general, even if the solution is stirred, an adhesion layer of several ⁇ m (expansion) is formed on the surfaces of the active material layers 7 and 9 where an electrode reaction occurs. It is thought that diffusion of reactive species will proceed most easily by adjusting the depth L of the voids 12 to less than this value. Is most preferably several / m or less.
  • the area of 1 la of the bonding surface is 30% or less of the total area of each of the opposing surfaces of the active material layers 7 and 9 and the separation 4, the separation between the active material layers 7 and 9 and the separation Since the increase in ion conduction resistance during the evening can be suppressed, and it is possible to use the battery at a high load factor that is not inferior to conventional liquid electrolyte type batteries, it is desirable that the content be 30% or less.
  • the area of the bonding surface 11a is less than 10%, the bonding strength between the separator 4 and the positive electrode and negative electrode active material layers 7 and 9 becomes weak. Is preferably 10% to 30% of the total area of each facing surface, and most preferably adjusted to about 20%.
  • the peeling between the positive and negative electrode active material layers 7 and 9 and the separator 4 is larger than the separation between the positive and negative electrode active material layers 7 and 9 and the separator 4. Since the destruction of the active material layer (peeling of the active material layer and the current collector) occurs preferentially, the bonding strength between the separator 4 and the positive electrode and the negative electrode active material layers 7 and 9 is increased by the positive current collector 6 and the positive electrode current collector, respectively. It is desirable that the bonding strength between the active material layer 7 and the negative electrode current collector 10 and the negative electrode active material layer 9 be equal to or higher than the bonding strength.
  • the adhesive resin layer 11 porous, it is possible to reduce the ionic conduction resistance in the adhesive resin layer and the joint, and it is possible to reduce the resistance between the electrodes. Furthermore, even if the adhesive resin layer 11 is adhered to the bonding surface 1 la, both surfaces of the separator 4 (opposite surface) or the entire surface of the active material layers 7 and 9 adjacent to this opposing surface, Since the ion conductivity can be secured through the micropores of the layer 11, the application of the adhesive resin layer 11 is facilitated. Further, by forming a void to which the adhesive resin layer 11 is not attached, the ion conduction resistance can be further reduced.
  • the lithium ion secondary battery configured as described above is convex on at least two surfaces of one surface of each of the positive electrode active material layer 7 and the negative electrode active material layer 9 and two opposite surfaces of the separator 4.
  • One surface of the positive electrode active material layer 7 and one surface of the negative electrode active material layer 9 are bonded to each surface of the night 4 and pressure-bonded, and the bonding surface 11a by the convex portion and the predetermined depth by the concave portion are formed. It is manufactured by performing a step of forming a plurality of layers of the electrode laminate 8 having the voids 12.
  • the adhesive resin layer it is preferable to locally adhere the adhesive resin layer to a portion corresponding to the convex portion, and form a void 12 to which the adhesive resin layer 11 is not attached.
  • the following methods can be used to apply the adhesive resin layer 11 locally and to apply a large amount of adhesive resin to both surfaces of the separator 4 in a short time.
  • FIG. 5 is an explanatory view showing a method of applying an adhesive resin using a rotating roll having fine holes on the surface, where (a) is viewed from above and (b) is viewed from the side.
  • Adhesive resin is filled inside the rotating roll 13 with micro holes 13 a on the surface, and pressure is applied to the inside of the rotating roll 13 with the pressurizer 16 to apply adhesive resin from the micro holes 13 a. Spill.
  • rotating the entire rotating roll 13 while moving the separating material 14 supplied from the separating roll 15 sandwiched between the rotating rolls 13, the separating material 1 4 Apply 1 7 in dots.
  • FIG. 6 there is a method of applying an adhesive resin using a screen and a rotating roll in which dots or linear holes are formed.
  • Separator screen 1 9 with holes 19 a opened in dot form Separation material 14 Installed near the surface of the material, Separation moving adhesive resin 17 from adhesive resin dropping port 20
  • the shape of the holes 19 a of the screen 19 is reduced.
  • the reflected adhesive resin 17 pattern is transferred to the separation evening material 14.
  • the adhesive resin can be applied to both surfaces of the separation material 14 in a dot-like manner.
  • FIG. 7 is an explanatory view showing a method of applying an adhesive resin using a spray gun.
  • the adhesive resin 17 adheres on the separation material 14 in a shape corresponding to the holes of the screen 26, for example, in a dot shape.
  • At least one spray gun 23 is arranged on each side of Separation Material 14 and at least one spray gun is continuously sprayed with the adhesive resin liquid while moving Separation Material 14.
  • the adhesive resin can be applied in the form of dots. Note that a net or the like may be used instead of the screen 26.
  • At least one or more dispensers 28 filled with resin liquid are arranged, and the adhesive resin liquid is dropped intermittently as the separator 27 moves, so that the adhesive resin is applied in a dot-like manner. It may be. (A) is viewed from above and (b) is viewed from the side.
  • Examples of the active material provided in the present invention include, in the positive electrode, a composite oxide of lithium and a transition metal such as cobalt, nickel, and manganese; a chalcogen compound containing lithium; or a composite compound thereof.
  • the above-mentioned composite oxides, chalcogen compounds containing lithium, or those having various additive elements in these composite compounds are used.
  • An aromatic hydrocarbon compound having an acene structure such as a carbon-based compound, billene, or perylene is preferably used, but any substance that can occlude and release lithium ions, which are the main components of battery operation, can be used.
  • These active materials are used in the form of particles.
  • the active material may have a particle diameter of 0.3 to 2 Ojm, and particularly preferably 0.3 to 5 zm.
  • any resin that does not dissolve in the electrolytic solution and does not cause an electrochemical reaction inside the electrode laminate can be used.
  • homopolymers or copolymers such as vinylidene fluoride, ethylene fluoride, acrylonitrile, and ethylene oxide, and ethylene propylene diamine rubber can be used.
  • any metal can be used as long as it is stable in the battery.
  • aluminum is preferably used for the positive electrode
  • copper is preferably used for the negative electrode.
  • the current collector may be in the form of foil, mesh, expanded metal, etc., but those having a large void area, such as meshed expanded metal, may be used after bonding. It is preferable in terms of facilitating the maintenance of the solution.
  • Separators can be made of any material having sufficient strength, such as an electronically insulating porous film, a net, and a non-woven fabric.
  • the material is not particularly limited, but polyethylene and polypropylene are preferable from the viewpoint of adhesiveness and safety.
  • a non-aqueous solvent and an electrolyte salt containing lithium used in a conventional battery can be used as a solvent and an electrolyte salt used for an electrolytic solution used as an ion conductor.
  • a non-aqueous solvent and an electrolyte salt containing lithium used in a conventional battery can be used as a solvent and an electrolyte salt used for an electrolytic solution used as an ion conductor.
  • ether solvents such as dimethoxetane, diethoxetane, getyl ether and dimethyl ether
  • ester solvents such as propylene carbonate, ethylene carbonate, getyl carbonate and dimethyl ether
  • two kinds of mixed liquids composed of different solvents can be used.
  • the electrolyte salt used for the electrolyte L i PF 6, L i A s F 6, L i C 1_Rei 4, L i BF 4, L i CF 3 S 0 3, L i N (CF 3 S 0 2) 2, L i C ( CF 3 S 0 2) 3, etc. L i N (C 2 F 5 S 0 2) 2 can be used.
  • the adhesive resin used to bond the current collector to the electrode and the adhesive resin used to bond the electrode to the separator are both insoluble in the electrolyte and do not cause an electrochemical reaction inside the battery. It is more preferable if it can be used and becomes a porous membrane.
  • a mixture mainly composed of a fluorine-based resin or a fluorine-based resin, or a mixture mainly composed of polyvinyl alcohol or polyvinyl alcohol A mixture is used.
  • a polymer or copolymer having a fluorine atom in its molecular structure such as vinylidene fluoride or 4-fluoroethylene
  • a polymer or copolymer having vinyl alcohol in its molecular structure or a polymer Methyl acrylate, polystyrene, polyethylene, polypropylene, polyvinylidene chloride, polyvinyl chloride, polyacrylonitrile, polyethylene Mixtures with such as can be used.
  • polyvinylidene fluoride, a fluororesin is suitable.
  • the positive electrode active material paste prepared by dispersing polyvinylidene fluoride vinylidene down the 5 parts by weight N- Mechirubi port Li Dong, Doc evening It was applied to a thickness of 30 by a single blade method to form an active material thin film.
  • An aluminum net with a thickness of 30 ⁇ m serving as a positive electrode current collector is placed on the upper part, and a positive electrode active material paste adjusted to a thickness of 300 by the doctor blade method is applied on the upper part again to form a positive electrode.
  • a laminate of the current collector and the positive electrode active material paste was produced.
  • the gap between the rolls was adjusted to 400 / m using a rotary port to remove the laminate.
  • a positive electrode having an uneven shape on the surface of the positive electrode active material layer was produced.
  • sandwiching an aluminum mesh instead of a flat aluminum foil as a current collector it is possible to create irregularities reflecting the shape of the mesh on the surface of the positive electrode active material layer 7.
  • the thickness of the electrode and the degree of the unevenness can be adjusted by adjusting the size of the gap between the rotary holes.
  • the shape of the mesh (wire diameter, mesh size, porosity, etc.) of the positive electrode current collector the shape of the unevenness formed on the surface of the positive electrode active material layer 7 can be changed. .
  • a 20 / m-thick copper mesh serving as a negative electrode current collector is placed on the upper part, and a negative electrode active material paste adjusted to a thickness of 300 m by the doctor blade method is applied to the upper part of the copper mesh again.
  • a laminate of a current collector and a negative electrode active material paste was prepared. After leaving the laminate in a dryer at 60 ° C for 60 minutes to make it semi-dry, the gap between the rolls was adjusted to 400 ⁇ m using a rotary port, and the laminate was Was rolled to a thickness of 400 ⁇ m so as to be in close contact with each other, thereby producing a negative electrode having an uneven shape on the surface of the negative electrode active material layer 9.
  • the positive electrode by sandwiching a copper net instead of a flat copper foil as a current collector, irregularities reflecting the net shape can be created on the surface of the negative electrode active material layer 9.
  • NMP N-methylpyrrolidone
  • Adhesive resin coating has micro holes 13a on the surface as shown in Fig. 5. This was performed using a rotating roll 13. The inside of the rotating roll 13 is filled with the above-mentioned adhesive resin liquid, and the adhesive resin liquid permeates through the minute holes 13a on the surface. Take out the separating material 14 from the separating roll 15 and rotate it while applying pressure to the inside of the rotating roll 13 having the minute holes 13 a on the separating material 14. Adhesive resin 17 could be applied to one side of Separet overnight material 14 in the form of dots. Also, the amount of the adhesive resin adhered could be adjusted by adjusting the pressure inside the rotating roll 13 and changing the discharge amount from the minute holes 13a.
  • the positive electrode 3 punched into a predetermined size was bonded, and a laminated body was formed in which the separator 4, the negative electrode 5, the separator 4, and the positive electrode 3 were joined in this order.
  • the adhesive resin liquid prepared above was applied to one surface of another separator which was punched into a predetermined size and joined with the negative electrode interposed therebetween, and the application surface of this separate separator was bonded to the first.
  • the laminate was bonded to the positive electrode surface. This process is repeated to form a battery body having a plurality of electrode laminates in which the positive electrode and the negative electrode face each other across the separator, and the battery body is dried while being pressurized. A laminated battery body was manufactured.
  • the adhesive resin layer 11 becomes a porous film (adhesive resin layer) having holes communicating from the separation side to the positive electrode and the negative electrode side due to the evaporation of NMP with drying.
  • the thickness of this adhesive resin layer is about lm W
  • the current collectors connected to the respective ends of the positive electrode and the negative electrode current collectors of the flat plate-shaped laminated battery body were spot-welded to each other between the positive electrode and the negative electrode. Electrically connected in parallel.
  • the flat plate-like layered structure cell body to the ethylene carbonate Jechiru as a solvent was injected electrolyte solution to the L i PF 6 as a solute.
  • the peel strength of the positive electrode active material and the separator was measured, and the peel strength of the negative electrode active material and the separator was measured.
  • the strengths were 25 to 30 gf / cm and 15 to 20 gfcm, respectively.
  • the lithium-ion secondary battery was manufactured by packing the flat-plate laminated battery body after the injection of the electrolytic solution with an aluminum laminate film, and performing heat sealing and sealing.
  • the positive electrode 3, the separator 4, and the negative electrode 5 have the surface facing the two active material layers 7 and 9 of the separator 4 and the positive electrode 5 active material layer 7 and the negative electrode active material.
  • a convex portion and a concave portion are formed on the surface of the layer 9 adjacent to the opposing surface of the separation layer 4.
  • the adhesive resin layer 11 attached to the joint surface 1 la of the convex portion is in close contact with the convex portion.
  • An electrolyte solution containing lithium ions is held in the voids 12 formed by the bonding surface 1 la and the recesses (generated according to the unevenness of the surface when the electrode and the separator are brought into close contact).
  • the active material layers 7 and 9 and the separator 4 are not completely covered with the adhesive resin layer 11 and the voids 12 hold the electrolyte so that the active material layers, and 9 and the separator 4 are separated.
  • the increase in internal resistance during one night is suppressed, good ionic conductivity is ensured, and the active material layers 7, 9 and the separation part 4 are formed on the joint surface 1 la of the convex part by the adhesive resin layer 11.
  • W thin, light-weight, high-capacity battery with excellent charge / discharge characteristics was obtained, which does not require external pressurization, that is, does not require a strong outer can.
  • the concave portions and convex portions shown in FIG. 4 are formed regularly on the surfaces of the positive electrode and negative electrode active material layers 7 and 9, and the separator 4 and the positive electrode and negative electrode active material layers 7 and 9 are formed. 9 is joined so that they coincide with each other on both sides of Separete 4 so that force acts on the joint surface between Separete 4 and the positive electrode 5 and the negative electrode active material layers 7, 9. In this case, strong bonding strength can be maintained.
  • the positive and negative electrode active material layers 7 and 9 have irregularities.
  • a fluororesin having irregularities formed on its surface is used as the separator 4 and the positive and negative electrode active material layers are used.
  • 7 and 9 may be those having a flat surface without forming concave and convex.
  • the adhesive resin layer 11 is selectively formed in the joining region, but may be applied to the entire surface of the separator 4. If the adhesive resin layer 11 is to be formed selectively in the bonding area, the position of the protrusion must match the position of the dot of the adhesive resin layer 11, but the entire surface of the separator 4 When the adhesive resin layer 11 is formed on the entire surface, the adhesive resin may be applied to the entire surface, so that the adhesive resin layer can be easily formed.
  • the injection of the electrolyte is performed by immersing the flat-plate laminated battery body in the electrolyte and depressurizing the electrolyte, thereby replacing the gas in the gap 12 with the electrolyte. This was easily achieved by: After the injection, the flat-plate-type laminated battery body was heated and dried.
  • the flat-plate laminated battery body is packed with an aluminum laminated film, the inside of the pack is decompressed, and the outer surface of the flat-layer laminated structure battery is brought into close contact with the film. 5 may be injected, and an electrolytic solution may be injected into at least the gap, and finally the opening may be sealed.
  • the battery body is used. Since the back surface and the film are in close contact with each other, it is possible to prevent the electrolyte solution from flowing into the back surface of the battery body, to eliminate unnecessary electrolyte solutions that do not contribute to the electrolytic action, and to reduce the weight of the entire battery. .
  • the positive electrode 3 is closely adhered and bonded between the two separators 4 in the same manner as described above, and an adhesive resin liquid is applied to one surface of the separator 4 with the positive electrode 3 interposed therebetween.
  • the process of pasting the negative electrode 5 on the application surface, and then pasting another positive electrode on the negative electrode 5 in which the positive electrode is pasted on the negative electrode 5 overnight may be repeated.
  • a viscous adhesive resin liquid prepared as the adhesive resin layer 11 shown in Example 1 by mixing the following compound in place of polyvinylidene fluoride and N-methylpyrrolidone in the same composition ratio was used.
  • a battery having a flat laminated battery body shown in FIG. 1 was produced in the same manner as in Example 1 above.
  • the peel strengths of the positive electrode active material layer 7 and Separation 4 and the negative electrode active material layer 9 and Separation 4 of this flat plate-shaped laminated battery were measured, the strengths were 15 to 70, respectively. gf / cm, converged to the range of 10 to 70 gf / cm. W
  • a lithium ion secondary battery was produced by injecting an electrolytic solution in the same manner as in Example 1 above, packing the package with an aluminum laminate film, and sealing it.
  • a battery that was thin, lightweight, excellent in charge / discharge characteristics, and large in battery capacity was obtained.
  • the positive electrode active material paste is applied to an aluminum mesh having a thickness of 30 m and an opening ratio of 70% by a doctor blade method so as to have a thickness of 300 / m, and dried at 60 ° C. After being left in the machine for 60 minutes, the positive electrode 3 was produced by pressing again to a thickness of 250 m.
  • the depth L of the void formed by la and the concave portion was 10 zm or less. Further, the negative electrode 5 was produced in the same manner using a copper net.
  • the depth L of the gap is adjusted to 10 ⁇ m or less, so that diffusion of the reactive species proceeds more easily, and the active material layer 7,09—separate interface Since the ion conduction resistance of the battery can be reduced, a lithium ion secondary battery using the same can be used at a high load factor not inferior to a conventional liquid electrolyte battery.
  • the depth L of the gap 12 can be adjusted by the pressing force during rolling when forming the positive electrode and the negative electrode, the wire diameter of the net, and the like. Example 4.
  • the adhesive resin was applied in the form of dots, and the positive electrode 3, the separator 4, the negative electrode 5, and the separator 4 were sequentially joined and laminated, as shown in FIG.
  • Such a flat-plate laminated battery body was manufactured.
  • the area of the bonding surface 11a of the electrode laminate 8 was adjusted to 20% of the total area of each of the active material layers 7 and 9. Since the covering portion of the adhesive resin layer is 20%, in the battery using the same, it is possible to suppress an increase in the ionic conduction resistance between the active material layers 7 and 9, and it is not inferior to the conventional liquid electrolyte type battery. Use at a high load factor became possible.
  • the area of 1 la of the joint surface is adjusted by the wire diameter of the net, the porosity, etc. It is adjusted by the shape of the active material layers 7 and 9 and the surface of the separator 4, and the application (adhesion) state of the adhesive resin. it can.
  • the positive electrode active material base was applied to a 300-m-thick aluminum punching metal current-collecting base material with a thickness of 30 / m and an aperture ratio of 80% by the doctor blade method to a thickness of 300 m. After standing in a drier at 0 ° C. for 60 minutes, it was pressed again so as to have a thickness of 250 ⁇ m, thereby producing a positive electrode 3 in which projections and depressions were formed on the surface of the active material layer 7. Also, the negative electrode 5 was manufactured by forming a convex portion and a concave portion on the surface of the active material layer 9 using a copper-made punching metal in the same manner.
  • the adhesive resin was applied in the form of dots, and the positive electrode 3, the separator 4, the negative electrode 5, and the separator 4 were sequentially joined and laminated, as shown in FIG. A flat plate-shaped laminated battery body was produced.
  • the depth L of the void 12 formed between the active material layers 7 and 9 and the separator 4 by the concave surface 11 a and the concave portion of the convex portion of the electrode laminate 8 is reduced to 10 ⁇ m or less.
  • the depth L of the gap can be adjusted by the pressing force during rolling during electrode formation, the aperture ratio of the punched metal, the shape of the holes, and the like.
  • the depth of the voids By adjusting the depth of the voids to 10 m or less, diffusion of the reactive species proceeds more easily, so that the ionic conduction resistance of the active material layers 7 and 9 and the separator 4 can be reduced. It can be used at a high load rate that is not inferior to that of liquid electrolyte type batteries.
  • the positive electrode active material paste was applied to a thickness of 300 zm on a punched aluminum current collecting base material with a thickness of 30 zm and an aperture ratio of 80% by the dough-blade method to a thickness of 300 zm. After standing in a dryer at 60 ° C. for 60 minutes, it was pressed again so as to have a thickness of 200 m, and a positive electrode 3 in which convex portions and concave portions were formed on the surface of the active material layer 7 was produced. Also, the negative electrode 5 was manufactured by forming a convex portion and a concave portion on the surface of the active material layer 9 using a copper-made punching metal in the same manner.
  • the adhesive resin was applied in the form of dots, and the positive electrode 3, the separator 4, the negative electrode 5, and the separator 4 were sequentially joined and laminated, and a flat plate as shown in FIG. A laminated battery structure was produced.
  • the area of 1 la of the bonding surface between the active material layers 7 and 9 and the separator was adjusted to 20% of the total area of each of the active material layers 7 and 9. 9 and Separation—The rise in ion conduction resistance in the evening can be suppressed, in other words, it can be reduced, making it possible to use the battery at a high load factor that is not inferior to conventional liquid electrolyte type batteries.
  • the positive electrode active material paste is applied on a 30- ⁇ m-thick aluminum foil current-collecting base material to a thickness of 300 m by the Doc Yuichi Blade Method, and then dried in a 60 ° C dryer. After standing for 60 minutes, an expanded metal with a thickness of 30 3m and an aperture ratio of 20% is pressed on the surface of the active material paste, and the expanded metal is pressed.
  • the positive electrode 3 was produced by forming irregularities having a depth of 30 / m on the surface of the active material layer 7 by removing the metal, and then pressing again so that the total thickness became 250 / m.
  • Negative electrode 5 was also produced in the same manner using a copper foil current collector.
  • the adhesive resin was applied in the form of dots, and the positive electrode 3, the separator 4, the negative electrode 5, and the separator 4 were sequentially joined and laminated.
  • a flat laminated structure battery body as shown in the figure was produced. At that time, the depth L of the void 10 formed by the recesses on the surfaces of the active material layers 7 and 9 between the active material layers 7 and 9 and the separator 4 was adjusted to be 10 m or less.
  • the positive electrode active material paste is applied on a 30 / m-thick aluminum foil current-collecting base material 5 to a thickness of 300 m by a doctor blade method, and dried in a 60 ° C dryer. After standing for 60 minutes, a punching metal with a thickness of 30 / m and an aperture ratio of 20% is pressed on the surface of the active material paste, and the punching metal is removed to form irregularities with a depth of 30 ⁇ m on the electrode surface. After that, pressing was performed again so that the total thickness became 250 ⁇ m, and a positive electrode was produced. Negative electrode 5 was also prepared in the same manner using a copper foil current collector.
  • the adhesive resin was applied in the form of dots, and the positive electrode 3, the separator 4, the negative electrode 5, and the separator 4 were sequentially joined and laminated, as shown in FIG. A flat plate-shaped laminated battery body was produced.
  • the area of the junction surface 11a between the active material layers 7, 9 and the separator 4 was adjusted to 20% of the total area of the active material layers 7, 59, so that the active material layers 7, 9 and the separator were separated.
  • the rise in ionic conduction resistance during one night can be suppressed, and the conventional liquid electrolyte It can be used at a high load rate that is not inferior to a rechargeable battery.
  • a battery was manufactured in the same manner as in Example 1 except that only the method of applying the adhesive resin liquid was changed.
  • a porous polypropylene sheet with a width of 12 cm and a thickness of 25 m (available from Hoechst # 24) 0 0) was taken out, and a shingle-shaped screen 19 having a hole 19 a in a dot shape having a diameter of 100 ⁇ m was pressed onto the separation material 14.
  • the adhesive resin liquid shown in Example 1 was dropped on the screen 19, and the adhesive resin was rolled from the screen at the coating port 21 to form a dot-like adhesive resin liquid on the separator. Transfer coating was possible.
  • the adhesive resin liquid was successfully applied to the two separators 4 sandwiching the negative electrode 5 therebetween.
  • the adhesive resin liquid shown in Example 2 was used, the adhesive resin liquid could be applied favorably in the form of dots on a separate plate. In this way, a lithium secondary battery having the same excellent characteristics as in Example 1 above was obtained even when the separation resin to which the adhesive resin layer was attached was used.
  • a battery was manufactured in the same manner as in Example 1 except that only the method of applying the adhesive resin liquid was changed.
  • a porous polypropylene sheet with a width of 12 cm and a thickness of 25 / m (Hoechst Celgard # 2400) is used as a material for separating material 14 and bundled in a roll.
  • a beaker-like screen 26 with holes formed in the shape of dots was placed in the vicinity of the surface of the material 14 for separation.
  • the adhesive resin liquid was sprayed onto the separation material 14 using the spray gun filled with the adhesive resin liquid shown in Example 1. Spraying evenly on the surface of Separation material 14 The adhesive resin liquid was applied in a dot-like manner.
  • the adhesive resin liquid was applied favorably to the two separators 4 joined together with the negative electrode 5 interposed therebetween.
  • the amount of the adhesive resin adhered could be adjusted by changing the spray speed.
  • the adhesive resin liquid shown in Example 2 was used, the adhesive resin liquid could be satisfactorily applied to the separation material in a dot-like manner.
  • a battery was manufactured in the same manner as in Example 1 except that only the method of applying the adhesive resin liquid was changed.
  • a roll of 12 cm wide and 25 mm thick porous polypropylene sheet (Hoechst Cell Guard # 2) 400) was taken out, and the adhesive resin liquid shown in Example 1 was filled into eight dispensers 28 arranged on one side of the separation material 14.
  • This adhesive resin liquid was applied intermittently to the surface of the separation material 14 at the same time as the separation resin material 14 was moved, whereby the adhesive resin solution could be applied in a dot-like manner.
  • the adhesive resin liquid was successfully applied in a dotted manner to the two separators 4 joined together with the negative electrode 5 interposed therebetween.
  • the adhesive resin liquid shown in Example 2 was used, the adhesive resin liquid was successfully applied to both surfaces of the separator.
  • a lithium secondary battery having excellent characteristics was obtained by using Separation overnight to which the adhesive resin layer was adhered.
  • the preparation of the negative electrode 5 and the positive electrode 3 and the preparation of the adhesive resin liquid were performed in the same manner as in Example 1 above.
  • the adhesive resin liquid prepared on one side of each of the two strip-shaped separators 4 was used as in Example 1 above.
  • apply in the form of dots After sandwiching the strip-shaped positive electrode between the two surfaces, bonding them together and placing them in a hot-air dryer at 60 ° C for 2 hours, evaporating the NMP of the adhesive resin solution, and separating the two sheets in the evening The positive electrode was joined.
  • the prepared adhesive resin solution is applied to one surface of the strip-shaped separator with the positive electrode interposed therebetween in a similar manner in a dot-like manner, and one end of the separator is placed with this one surface in the middle.
  • the negative electrode 5 cut into a predetermined size was sandwiched between the folds and the fold, and the pieces were overlaid and passed through Lamine overnight.
  • the adhesive resin liquid prepared above was applied to the other surface of the strip-shaped separator in a dot-like manner in the same manner, and the predetermined size was applied to a position facing the negative electrode 5 sandwiched between the folds.
  • a battery body having the above electrode laminate was formed, and this battery body was dried while being pressurized to produce a flat-plate wound type laminated structure battery body as shown in FIG.
  • the current collectors connected to the ends of each of the negative electrode current collectors of the flat-plate-shaped laminated battery body were electrically connected in parallel by spot welding. Further, the flat wound type laminated structure battery body was impregnated with an electrolytic solution in the same manner as in Example 1 and sealed to obtain a secondary battery.
  • the positive electrode 3 and the negative electrode 5 and the separator 4 are in close contact with each other by the adhesive resin layer 11 attached to the joint surface of the convex portion, and Since good ion conductivity can be ensured by the retained electrolyte, a thin, light-weight, large-capacity battery with excellent charge / discharge characteristics that does not require a strong outer can was obtained.
  • a strip-shaped positive electrode 3 is joined between strip-shaped separators 4 while being wound up, and a plurality of negative electrodes 5 having a predetermined size are sandwiched therebetween.
  • the strip-shaped negative electrode 5 is placed between the strip-shaped separators 4.
  • a method may be used in which a plurality of the positive electrodes 3 having a predetermined size are sandwiched therebetween while the joined members are wound up.
  • the method of winding the separator 4 has been described, but the band-shaped seno, which is formed by joining the band-shaped negative electrode 5 or the positive electrode 3 between the layers 4, is folded into a predetermined size.
  • a method in which the positive electrode 3 or the negative electrode 5 is sandwiched therebetween and bonded together may be used.
  • the strip-shaped positive electrode 3 is arranged between two strip-shaped separators 4, and the strip-shaped negative electrode 5 is arranged so as to protrude outside the one separator by a certain amount.
  • the prepared adhesive resin liquid is applied to the inner surface of each separator 4 and the outer surface of the separator 4 on which the negative electrode 5 is to be disposed, in a dot-like manner by the above-described coating method.
  • a predetermined amount of one end of the negative electrode 5 is passed through Lamine overnight, and then a negative electrode 5, Separe night 4, Positive electrode 3 and Separe night 4 are laminated to form a laminar laminate. did.
  • the prepared adhesive resin liquid is applied to the outer surface of the other separator in the band-shaped laminate, and the protruded negative electrode 5 is bent and bonded to the coated surface, and the bent negative electrode 5 is bonded.
  • the laminated body that has been laminated is wrapped in an elliptical shape so as to be wrapped inside, to form a battery body having a plurality of electrode laminates as shown in FIG. 3, and this battery body is dried while being pressurized. Then, the negative electrode, the separator, and the positive electrode were simultaneously bonded to produce a flat-plate-type laminated battery.
  • Example 1 An electrolytic solution was injected into the flat wound type laminated structure battery body in the same manner as in Example 1 and sealed to obtain a battery. As in the case of Example 1 above, a battery having a small thickness, light weight, excellent charge / discharge characteristics, and a large battery capacity was obtained.
  • a strip-shaped positive electrode 3 is arranged between strip-shaped separators 4.
  • the negative electrode 5 is placed outside the separator 4 and rolled up.
  • the belt-like negative electrode 5 is placed between the belt-like separator 4 and the other separator is placed outside the separator 4.
  • a method of arranging and winding the positive electrode 3 may be used.
  • It is used as a secondary battery for portable electronic devices such as personal computers and mobile phones, and can be made smaller, lighter, and arbitrarily shaped while improving the performance of the battery.

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Abstract

La présente invention concerne une batterie auxiliaire au lithium dans laquelle la connexion électrique entre une couche de matériau actif et un séparateur peut être maintenue sans l'utilisation d'un bac solide; qui permet d'obtenir une densité d'énergie très élevée et qui peut se présenter sous différentes formes, plate par exemple; et qui possède d'excellentes propriétés de charge et de décharge. Cette batterie de forme plate à structure feuilletée comprend des couches d'électrodes laminées qui présentent des parties en saillie et des parties en retrait sur au moins deux faces, une face contiguë à un séparateur disposé entre une couche de matériau actif d'électrode positive et une couche de matériau actif d'électrode négative et l'autre face opposée aux deux couches de matériau actif du séparateur. Les trois composants sont joints et collés rapidement les uns aux autres par des couches de résine adhésive, et les électrolytes y compris les ions lithium sont retenus dans le séparateur et dans l'espace créé par la face de jonction des parties en retrait et des parties en saillie de façon à assurer la connexion électrique.
PCT/JP1997/004678 1997-12-18 1997-12-18 Batterie auxiliaire au lithium et sa fabrication WO1999031751A1 (fr)

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JP2012528456A (ja) * 2009-05-26 2012-11-12 オプトドット コーポレイション ナノ多孔性セパレータ層を利用するリチウム電池
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JP2015138770A (ja) * 2014-01-24 2015-07-30 旭化成イーマテリアルズ株式会社 積層体、蓄電デバイス用セパレータ、蓄電デバイス、リチウムイオン二次電池および共重合体
JP2015537337A (ja) * 2013-01-16 2015-12-24 エルジー・ケム・リミテッド 電極組立体の製造装置
JP2016522553A (ja) * 2013-09-30 2016-07-28 エルジー・ケム・リミテッド リチウム二次電池用セパレーターの製造方法、その方法により製造されたセパレーター、及びこれを含むリチウム二次電池
JP2016535923A (ja) * 2013-11-04 2016-11-17 エルジー・ケム・リミテッド 二次電池用接着層の形成方法
JP2018055951A (ja) * 2016-09-28 2018-04-05 日産自動車株式会社 二次電池
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