WO1999026307A1 - Lithium ion secondary battery and manufacture thereof - Google Patents
Lithium ion secondary battery and manufacture thereof Download PDFInfo
- Publication number
- WO1999026307A1 WO1999026307A1 PCT/JP1997/004200 JP9704200W WO9926307A1 WO 1999026307 A1 WO1999026307 A1 WO 1999026307A1 JP 9704200 W JP9704200 W JP 9704200W WO 9926307 A1 WO9926307 A1 WO 9926307A1
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- separator
- electrode
- secondary battery
- positive electrode
- negative electrode
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- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- 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
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- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- 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
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- 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
- H01M50/409—Separators, membranes or diaphragms characterised by the material
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- 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
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- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
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- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
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- 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
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/497—Ionic conductivity
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- 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
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- 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
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- 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
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- 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 lithium ion secondary battery in which a positive electrode and a negative electrode face each other with a separator holding an electrolyte interposed therebetween, and more particularly, to an electrical connection between a positive electrode and a negative electrode (electrode) and a separator.
- the present invention relates to a battery structure that can be modified to take any form such as a thin shape. Background art
- lithium-ion batteries are secondary batteries that can achieve the highest voltage, high energy density, and high load resistance of existing batteries, and improvements are being actively made even today.
- This lithium ion secondary battery has, as its main components, a positive electrode, a negative electrode, and a thin 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 for a positive electrode and applied to an aluminum current collector.
- a carbon-based active material powder mixed with a binder and it is applied to a copper current collector to form a plate.
- polyethylene or polypropylene A film in which a porous film such as ren is filled with a non-aqueous solvent containing lithium ions is used.
- FIG. 5 is a schematic cross-sectional view showing the structure of a conventional cylindrical lithium 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 positive electrode 3, a separator 4 and a negative electrode 5. It has a spirally wound structure.
- the electrode body 2 needs to apply an external pressure to the electrode surface in order to maintain the electrical connection between the positive electrode 3, the separator 4 and the negative electrode 5. For this reason, all in-plane contacts are maintained by placing the electrode body 2 in a strong metal can.
- prismatic batteries a method has been used in which rectangular electrodes are bundled and placed in a rectangular metal can to apply pressure from the outside and press down.
- 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.
- the electrodes are brought into close contact by integrating the electrode and the electrolyte layer, so that the electrical connection between the electrodes is maintained without applying external force, and the battery operates.
- the electrode and the solid electrolyte are joined with a binder.
- a binder since the interface between the electrode and the electrolyte is covered with the binder, for example, a liquid electrolyte is used. It is disadvantageous in terms of ionic conductivity as compared with the case of using. Even if a binder having ionic conductivity is used, a material having ionic conductivity equal to or higher than that of the liquid electrolyte has not been generally found, and battery performance similar to that of a battery using a liquid electrolyte has been found. There were problems such as difficulty in obtaining them.
- a metal outer can is required to hold the liquid electrolyte at the interface between the electrode and the electrolyte, which is disadvantageous in terms of energy density, while a metal outer can is required for the electrode-electrolyte bonding type.
- the conductivity at the electrode-electrolyte interface is lower than that of batteries using liquid electrolyte, It is disadvantageous in terms of battery performance such as charge and discharge characteristics.
- a non-aqueous electrolyte generally used for a lithium ion battery has a conductivity of 1/10 or less as compared with an aqueous electrolyte. For this reason, it is necessary to increase the battery area to reduce the battery internal resistance.
- a configuration in which several strips are stacked there are a configuration in which several strips are stacked, a configuration in which the electrode is wound around a strip-shaped separator, and a configuration in which the electrode is folded.
- This configuration can be applied to the assembly of a battery in which the electrode and the separator are joined by an adhesive layer.However, in the method of winding while bonding, it is possible to apply the entire ⁇ winding method compared to winding without bonding. The problem was that the speed was slow and assembly productivity was poor. In addition, when the wound battery body is stopped with a tape band from the outside without any adhesion, the interface between the electrode and the separator is not sufficiently adhered, so the internal resistance is large. This was a practical problem.
- the present invention has been made as a result of intensive studies on the separation method and a preferable lamination method of the electrodes by the present inventors in order to solve the above-mentioned problem, and the electrodes and the separator were used without using a strong outer can. It is an object of the present invention to obtain a practical lithium-ion rechargeable battery having a low internal resistance, which can be closely adhered to the battery, with high productivity. Disclosure of the invention
- a first lithium ion secondary battery includes a strip-shaped positive electrode having a positive electrode active material layer and a positive electrode current collector, a strip-shaped negative electrode having a negative electrode active material layer and a negative electrode current collector, and an electrolyte including lithium ions.
- the battery comprises a flat-plate-type wound laminated battery body in which one of the positive electrode and the negative electrode and the separator are bonded with an adhesive layer.
- a plate-shaped wound laminated battery body can be manufactured by winding a separator having a separator attached to one of the positive electrode and the negative electrode together with the remaining negative electrode or the positive electrode in advance.
- the time required to dry the adhesive is reduced as compared with the case where the adhesive is used.
- the operation with two electrodes, the electrode with the sensor and the remaining electrode is simpler, so the operation is simpler, and the gap between the electrode and the separator is less.
- the probability of internal short circuit due to contact between the positive electrode and negative electrode is low and safety is improved.
- the adhesion between the electrode and the separator is high, a lithium secondary battery having a low battery internal resistance can be obtained.
- a second lithium ion secondary battery according to the present invention is the first lithium ion secondary battery, wherein the adhesive layer is a porous adhesive resin layer holding an electrolyte.
- the electrode and the separator can be brought into close contact with each other by the adhesive resin layer, and the liquid electrolyte is held in the through-hole of the adhesive resin layer communicating between the electrode and the separator.
- good ionic conductivity at the electrode-electrolyte interface can be ensured, so that a lithium secondary battery with high charge / discharge characteristics that can be made high in energy density and thin and that can take any form is obtained.
- a third lithium ion secondary battery according to the present invention is the second lithium ion secondary battery, wherein the porosity of the porous adhesive resin layer is equal to or higher than the porosity of the separator. is there. Thereby, the conductive conductivity of the adhesive resin layer holding the electrolytic solution can be set to an appropriate value.
- a fourth lithium-ion secondary battery according to the present invention is the second lithium-ion secondary battery according to the second lithium-ion secondary battery, wherein the ionic conduction resistivity of the adhesive resin layer holding the electrolyte is measured by a separator layer holding the electrolyte. Equivalent to or lower than the conduction resistivity This is the one below. Thereby, excellent charge / discharge characteristics are maintained without deteriorating the charge / discharge characteristics.
- a fifth lithium ion secondary battery according to the present invention is the second lithium ion secondary battery, wherein the adhesive resin layer uses a mixture mainly composed of a fluorine-based resin or a fluorine-based resin as the adhesive resin layer. is there.
- a sixth lithium secondary battery according to the present invention is the above-described fourth lithium secondary battery, wherein polyvinylidene fluoride is used as a fluorine-based resin.
- a seventh lithium secondary battery according to the present invention is the second lithium ion secondary battery, wherein the adhesive resin layer uses polyvinyl alcohol or a mixture containing polyvinyl alcohol as a main component.
- the adhesive resin layer uses polyvinyl alcohol or a mixture containing polyvinyl alcohol as a main component.
- the first method for producing a lithium ion secondary battery according to the present invention may be configured such that any one of a band-shaped positive electrode having a positive electrode active material layer and a positive electrode current collector and a band-shaped negative electrode having a negative electrode active material layer and a negative electrode current collector is provided.
- a step of obtaining one electrode with a separator by sandwiching one of the electrodes between two belt-shaped separators to form an electrode with a separator, and separating the electrode with the separator and the other electrode of the positive electrode and the negative electrode from the separator with the separator And a step of winding so that the positive electrode and the negative electrode are alternately arranged.
- a material obtained by previously bonding a seno-type laser to one of the positive electrode and the negative electrode is wound together with the remaining negative electrode or the positive electrode.
- the time required is reduced.
- a lightweight lithium-ion secondary battery that does not require a strong outer can, ensures safety, and has low internal resistance can be obtained with high productivity.
- FIG. 1 is a schematic cross-sectional view showing a configuration of a flat-plate wound laminated structure electrode body of a lithium ion secondary battery according to one embodiment of the present invention
- FIG. 2 is a cross-sectional view shown in FIG.
- FIG. 3 is a schematic cross-sectional view showing a main part of an electrode body.
- FIG. 3 is a characteristic diagram showing discharge characteristics of the batteries of Examples 1 to 3 and a battery of a comparative example.
- FIG. 5 is a characteristic diagram showing the relationship between the amount of the adhesive resin in the adhesive resin solution and the internal resistance during the formation of the adhesive resin layer according to the embodiment, and FIG. 5 shows a conventional lithium secondary battery. It is a cross section showing an example. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a schematic cross-sectional view showing a configuration of a flat-plate wound type laminated electrode body of a lithium ion secondary battery according to one embodiment of the present invention.
- FIG. 2 is a main part of FIG.
- FIG. 2 is an enlarged schematic cross-sectional view showing the structure of FIG.
- the lithium ion secondary battery according to the present invention is a flat plate in which a strip-shaped positive electrode and a strip-shaped negative electrode are alternately arranged between the wound strip-shaped separators, and one of the positive electrode and the negative electrode and the separated sheet are bonded with an adhesive layer. It has a spirally wound laminated structure.
- 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.
- a separator is disposed between the negative electrode 5 and the negative electrode 5 and holds an electrolyte containing lithium ions.
- 11 is a porous adhesive resin layer 11 that joins the negative electrode active material layer 9 and the separator 4.
- the resin layer 11 has a large number of through holes 12 communicating the negative electrode active material layer 9 and the separator 4, and the electrolyte solution is held in these through holes.
- Strip-shaped positive electrode 3 and negative electrode 4 are alternately arranged between the wound strip-shaped separators 4, and one of the positive electrode 3 and the negative electrode 5 and the separator 4 are bonded to each other with an adhesive layer 11 1 Since it has a laminated structure, a plate-shaped wound laminated battery body is manufactured by winding a separator 4 in advance on one of the positive electrode 3 and the negative electrode 5 together with the remaining negative electrode 5 or positive electrode 3. The time required for drying the adhesive is reduced as compared with the case where the adhesive is simultaneously wound. Also, compared to the case where the positive electrode, the negative electrode and the separator are wound without bonding at all, it is only necessary to wind the two electrodes, one with the sensor and the other, so that workability is good and the winding device is greatly improved.
- the gap between the electrode and the separator is small and the possibility of internal short circuit due to contact between the positive electrode and the negative electrode is low, improving safety.
- the adhesion between the electrode and the separator is high, a lithium secondary battery with a low internal resistance of the battery can be used.
- the electrode layer that is, the active material layer 7 or 9) and the separator 4 serving as the electrolyte layer are joined by the porous adhesive resin layer 11, the adhesion strength between the electrode and the separator is improved. Can be secured.
- the electrolyte is held in the through hole 12 which communicates with the inside, that is, the interface between the electrode and the separator formed in the adhesive resin layer 11, a good interface between the electrode and the electrolyte is obtained. Conduction can be ensured, and the conduction resistance between the electrodes can be reduced at the same time.
- the amount of ions entering and exiting in the active material inside the electrode and the moving speed and amount of ions to the opposing electrode can be reduced to about the same level as a lithium ion battery having a conventional housing.
- the electrical connection between the electrodes can be maintained without applying external force. Therefore, a strong outer can for maintaining the battery structure is not required, and the battery can be reduced in weight and thickness. Both have the same excellent charge and discharge characteristics and battery performance as batteries using electrolyte.
- the ionic conductivity of the adhesive resin layer 11 holding the electrolytic solution equal to or less than the ionic conductivity of the separator 4 holding the electrolytic solution,
- the charge / discharge characteristics of the battery can be maintained at the level of the conventional battery without deteriorating the charge / discharge characteristics.
- the ionic conductivity of the adhesive resin layer 11 can be adjusted mainly by changing its porosity and thickness.
- the porosity can be adjusted by, for example, the amount of the adhesive resin to ⁇ ⁇ ⁇ -methylpyrrolidone in the adhesive resin solution forming the adhesive resin layer.
- the porosity is preferably equal to or higher than the porosity of the separator 4 used.
- the adhesive resin used for bonding the active material layer and the separator is a porous film that does not dissolve in the electrolyte and does not cause an electrochemical reaction inside the battery.
- a mixture mainly composed of a base resin, polyvinyl alcohol or a mixture mainly composed of polyvinyl alcohol 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 skeleton, or polymethacrylic Mixtures with methyl acid, polystyrene, polyethylene, polypropylene, polyvinylidene chloride, polyvinyl chloride, polyacrylonitrile, polyethylene chloride and the like can be used.
- polyvinylidene fluoride, a fluororesin is suitable.
- an adhesive is applied to one surface of two belt-shaped separators 4, and the belt-shaped positive electrode 3 (or negative electrode) is glued to the separator 4.
- the negative electrode 5 (and The positive electrode is rolled up in an oval shape such that the positive electrode 3 and the negative electrode 5 are alternately arranged during the separation 4.
- Examples of the active material provided in the present invention include, for the positive electrode, a composite oxide of lithium and a transition metal such as phenol, nickel, or manganese; a chalcogen compound;
- a graphitizable carbon, a non-graphitizable carbon, a carbonaceous compound such as polyacene and polyacetylene, and an aromatic hydrocarbon compound having an acene structure such as pyrene and perylene are preferably used.
- any substance that can store 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 size of 0.3 to 2, particularly preferably 0.3 to 5 A6 m.
- 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, fluorinated ethylene, 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, but aluminum is preferably used for the positive electrode and copper is preferably used for the negative electrode.
- the current collector can be in the form of foil, mesh, or expanded metal, but a large void area such as mesh or expanded metal makes it easier to hold the electrolyte after bonding. Preferred from the point.
- the adhesive resin used to bond the current collector to the electrode does not dissolve in the electrolytic solution and does not cause an electrochemical reaction inside the battery. What becomes a porous membrane is used.
- fluorine molecules such as vinylidene fluoride and 4-fluoroethylene Polymers in the structure, or mixtures with polymethyl methacrylate, polystyrene, polyethylene, polypropylene, etc., polymers or copolymers with vinyl alcohol in the molecular skeleton, or polymethyl methacrylate, polystyrene, polyethylene, polypropylene, Mixtures such as polyvinylidene chloride, polyvinyl chloride, polyacrylonitrile and polyethylene oxide can be used. Particularly, polyvinylidene fluoride or polyvinyl alcohol is preferable.
- any material having a sufficient strength such as an electronically insulating porous film, a net, and a nonwoven fabric can be used.
- 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 to be used for an electrolyte solution used as an ion conductor.
- ether solvents such as dimethoxetane, jetoxetane, getyl ether, dimethyl ether, etc .
- Two kinds of mixed liquids composed of different solvents can be used.
- the electrolyte salt to be subjected to electrolytic solution L i PF 6, L i A s F 6N L i C10 4, L i BF 4, L i CF 3 S 0 3 L i N (CF 3 S0 2) 2, L i N (C 2 F 5 SO 2 ) 2 L i C (CF 3
- a method using Barco overnight, a method using a spray gun, or a dipping method is used as a means for applying the adhesive resin.
- a cathode active material paste prepared by dispersing 87 parts by weight of Li CoO 2 , 8 parts by weight of graphite powder, and 5 parts by weight of polyvinylidene fluoride in N-methylpyrrolidone is used as a positive electrode current collector.
- the active material thin film was formed on a 20-m-thick strip-shaped aluminum foil by applying it while adjusting the thickness to 150 m by a doctor blade method. This was left in a dryer at 60 ° C for 60 minutes to dry it, and then pressed so that the thickness of the positive electrode active material layer became 100 m.
- a strip-shaped positive electrode 3 on which a 1 O OAtm positive electrode active material layer 7 was formed was produced.
- a negative electrode active material paste prepared by dispersing 95 parts by weight of mesophase microbeads (trade name: Osaka Gas) and 5 parts by weight of polyvinylidene fluoride in N-methylpyrrolidone (abbreviated as NMP) was used.
- An active material thin film was formed on a 20-m-thick strip-shaped copper foil serving as a negative electrode current collector by applying a doctor blade method while adjusting the thickness to 15 mm. This was dried by leaving it in a dryer at 60 ° C for 60 minutes, and then pressed so that the thickness of the negative electrode active material layer became 10 ⁇ m, whereby the copper foil negative electrode current collector 10
- a strip-shaped negative electrode 5 in which 10 negative electrode active material layers 9 were formed was produced.
- NMP N-methylpyrrolidone
- the adhesive resin prepared as described above was applied to one surface of each of two strip-shaped polyethylene porous sheets (ME 9630, manufactured by Asahi Kasei Corporation) to serve as two separators 4. After the solution is applied uniformly, before the adhesive dries, the strip-shaped negative electrode 5 (or positive electrode) prepared above is sandwiched between the coated surfaces of the separator and adhered closely. At this time, the width and length of the separator 4 are slightly larger than those of the negative electrode 5 (or the positive electrode). Next, the negative electrode 5 (or the positive electrode) on which Separation 4 was attached was placed in a hot air dryer at about 80 ° C to evaporate NMP. At this time, the through holes 12 in the adhesive layer 11 are formed after the NMP is removed.
- ME 9630 manufactured by Asahi Kasei Corporation
- the strip-shaped positive electrode 3 (or the negative electrode) is arranged so as to protrude by a fixed amount outside one side of the separator 4 attached to the strip-shaped negative electrode 5 (or the positive electrode), and the other separator 4 Bend the positive electrode 3 (or negative electrode) protruding from the outer surface, and wind up the separator with negative electrode 5 (or positive electrode) in an oval shape so that the bent positive electrode 3 (or negative electrode) is wrapped inside. Finally, the remaining separator portion was adhered and fixed to the wound electrode body with an adhesive to produce a plate-shaped wound laminated electrode body.
- FIG. 3 shows a comparison of the discharge characteristics of the battery according to the comparative example and the battery according to the example 1 in which the electrolyte was injected and sealed with an aluminum film. From the figure, it can be seen that Example 1 has a lower internal resistance, and thus maintains a capacity capable of discharging even a larger current.
- the characteristic diagram in Fig. 4 shows that the amount of the adhesive resin in the adhesive resin solution was changed to 5 parts by weight, 7 parts by weight, and 10 parts by weight with respect to NMP, with the filler being 5 parts by weight.
- a battery having a plate-shaped wound laminated electrode structure as shown in FIG. 1 was produced in the same manner as in Example 1 except that only the adhesive resin solution shown in Example 1 was changed.
- a viscous adhesive resin solution was prepared.
- a battery having a plate-shaped wound laminated electrode structure as shown in FIG. 1 was produced in the same manner as in Example 1 except that only the adhesive resin solution shown in Example 1 was changed.
- a viscous adhesive solution was prepared by dissolving or mixing polyvinyl alcohol, a mixture of polyvinyl alcohol and polyvinylidene fluoride, a mixture of polyvinyl alcohol and polyacrylonitrile, and a mixture of polyvinyl alcohol and polyethylene chloride in NMP, respectively.
- a battery having a plate-shaped wound laminated battery body was produced in the same manner as in Example 1 above. As shown in FIG. 3, the discharge current-capacity characteristics of this battery were superior to those of the comparative example.
- the adhesive resin solution is applied by the Barco overnight method, but the adhesive resin solution may be applied by a spray gun.
- It is used as a secondary battery for portable electronic devices such as mobile personal computers and mobile phones, and can be made smaller, lighter and arbitrarily shaped as well as improving battery performance.
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Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69738111T DE69738111T2 (de) | 1997-11-19 | 1997-11-19 | Lithiumionensekundärbatterie und deren herstellung |
JP51655599A JP3393145B2 (ja) | 1997-11-19 | 1997-11-19 | リチウムイオン二次電池 |
US09/341,665 US6232014B1 (en) | 1997-11-19 | 1997-11-19 | Lithium ion secondary battery and manufacture thereof |
KR10-1999-7006450A KR100397043B1 (ko) | 1997-11-19 | 1997-11-19 | 리튬이온 2차전지 및 그의 제조방법 |
PCT/JP1997/004200 WO1999026307A1 (en) | 1997-11-19 | 1997-11-19 | Lithium ion secondary battery and manufacture thereof |
EP97912501A EP0954042B1 (en) | 1997-11-19 | 1997-11-19 | Lithium ion secondary battery and manufacture thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1997/004200 WO1999026307A1 (en) | 1997-11-19 | 1997-11-19 | Lithium ion secondary battery and manufacture thereof |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/341,665 A-371-Of-International US6232014B1 (en) | 1997-11-19 | 1997-11-19 | Lithium ion secondary battery and manufacture thereof |
US09/809,076 Division US6376125B2 (en) | 1999-07-19 | 2001-03-16 | Lithium ion secondary battery and process for producing the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999026307A1 true WO1999026307A1 (en) | 1999-05-27 |
Family
ID=14181503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP1997/004200 WO1999026307A1 (en) | 1997-11-19 | 1997-11-19 | Lithium ion secondary battery and manufacture thereof |
Country Status (6)
Country | Link |
---|---|
US (1) | US6232014B1 (ja) |
EP (1) | EP0954042B1 (ja) |
JP (1) | JP3393145B2 (ja) |
KR (1) | KR100397043B1 (ja) |
DE (1) | DE69738111T2 (ja) |
WO (1) | WO1999026307A1 (ja) |
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JP5073144B2 (ja) * | 2000-06-07 | 2012-11-14 | 三洋電機株式会社 | リチウムイオン二次電池 |
JP4847861B2 (ja) * | 2004-03-30 | 2011-12-28 | パナソニック株式会社 | 非水電解液二次電池 |
KR100790280B1 (ko) * | 2004-03-30 | 2008-01-02 | 마쯔시다덴기산교 가부시키가이샤 | 비수전해액 2차 전지 |
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KR20150125700A (ko) | 2013-03-05 | 2015-11-09 | 교리쯔 가가꾸 산교 가부시키가이샤 | 전지 전극 또는 세퍼레이터 코팅막 조성물, 이를 사용해서 얻어지는 코팅막을 갖는 전지 전극 또는 세퍼레이터, 및 이 전지 전극 또는 세퍼레이터를 갖는 전지 |
US11469476B2 (en) | 2017-10-20 | 2022-10-11 | Lg Energy Solution, Ltd. | Separator and electrochemical device comprising same |
US11699831B2 (en) | 2017-10-20 | 2023-07-11 | Lg Energy Solution, Ltd. | Separator and electrochemical device comprising same |
Also Published As
Publication number | Publication date |
---|---|
KR20000070224A (ko) | 2000-11-25 |
KR100397043B1 (ko) | 2003-09-02 |
DE69738111T2 (de) | 2008-05-29 |
JP3393145B2 (ja) | 2003-04-07 |
EP0954042A1 (en) | 1999-11-03 |
US6232014B1 (en) | 2001-05-15 |
EP0954042B1 (en) | 2007-09-05 |
DE69738111D1 (de) | 2007-10-18 |
EP0954042A4 (en) | 2005-01-19 |
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