WO2000013252A1 - Procede de production d'un element electrolytique en gel non aqueux - Google Patents
Procede de production d'un element electrolytique en gel non aqueux Download PDFInfo
- Publication number
- WO2000013252A1 WO2000013252A1 PCT/JP1999/004746 JP9904746W WO0013252A1 WO 2000013252 A1 WO2000013252 A1 WO 2000013252A1 JP 9904746 W JP9904746 W JP 9904746W WO 0013252 A1 WO0013252 A1 WO 0013252A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gel electrolyte
- negative electrode
- positive electrode
- active material
- electrolyte
- Prior art date
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Classifications
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0416—Methods of deposition of the material involving impregnation with a solution, dispersion, paste or dry powder
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
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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
- H01M2300/00—Electrolytes
- H01M2300/0085—Immobilising or gelification of electrolyte
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/121—Organic 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
- H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/18—Cells with non-aqueous electrolyte with solid electrolyte
- H01M6/188—Processes of manufacture
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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
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/49112—Electric battery cell making including laminating of indefinite length material
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/49115—Electric battery cell making including coating or impregnating
Definitions
- the present invention relates to a method for manufacturing a non-aqueous gel electrolyte battery having a high voltage and a large discharge energy.
- batteries have become important as power sources for portable electronic devices.
- a secondary battery is used as a power source for driving portable electronic devices and the like for the purpose of economy and resource saving, and its use has been rapidly expanding in recent years.
- Portable electronic devices are required to be small and lightweight.Batteries must have a small storage space in the device, and be lightweight so as not to increase the weight of the electronic device as much as possible. It has been demanded. In addition, long-term use is also required. In other words, with the miniaturization and higher performance of portable electronic devices, batteries used are required to be smaller, lighter and have higher capacities.
- a non-aqueous lithium secondary battery having a higher energy density and a higher output density than a lead battery or a nickel cadmium battery has been attracting attention.
- non-aqueous lithium secondary batteries use lithium in the positive electrode during charging.
- This battery uses an electrochemical reversible reaction in which lithium is occluded in the negative electrode through the electrolyte and lithium in the negative electrode is occluded in the positive electrode through the electrolyte during discharge.
- a non-aqueous solvent in which a lithium salt is dissolved is used.
- hard cells a positive electrode lid and a negative electrode can
- a non-aqueous gel electrolyte battery has a positive electrode in which a positive electrode active material layer is coated on a positive electrode current collector, and a negative electrode in which a negative electrode active material layer is coated on a negative electrode current collector. Contains electrolyte between the active material layer and the negative electrode active material layer of the negative electrode It has a structure in which a gel layer is sandwiched.
- the electrolyte-containing gel layer of such a non-aqueous gel electrolyte battery the electrolyte is held in the gel matrix. Therefore, in the non-aqueous gel electrolyte battery, the problem of electrolyte leakage is eliminated, so that a hard cell is not required, and a further reduction in size, weight, thickness, and shape flexibility is realized. .
- the present invention provides a non-aqueous gel electrolyte in which an electrolyte solution-containing gel layer is applied to a positive electrode active material layer of a positive electrode and a negative electrode active material layer of a negative electrode, and the electrolyte solution-containing gel layers are stacked on each other. It is an object of the present invention to improve the permeation of an electrolyte retained in a gel matrix in an electrolyte-containing gel layer into an electrode active material layer in a battery, thereby realizing a higher capacity.
- the present inventors applied the electrolyte-containing gel layer in a sol state when applying the electrolyte-containing gel layer on the electrode active material layer, so that the electrolyte soaked into the electrode active material layer. They have found that it becomes easier, and have completed the present invention.
- the present invention forms a positive electrode active material layer on a positive electrode current collector to form a positive electrode.
- a negative electrode is formed by forming a negative electrode active material layer on a negative electrode current collector and forming a negative electrode, and applying a gel electrolyte composition on the positive electrode active material layer of the positive electrode and / or the negative electrode active material layer of the negative electrode.
- a method for producing a non-aqueous gel electrolyte battery in which an electrolyte layer is formed and a positive electrode and a negative electrode are overlapped so that the gel electrolyte layer is sandwiched between the gel electrolyte composition and the positive electrode active material layer of the positive electrode It is characterized by being applied on Z or a negative electrode active material layer of a negative electrode.
- the viscosity of the sol-gel electrolyte composition is preferably 1 to 50 cp.
- the gel electrolyte composition may be heated or diluted with a non-aqueous solvent.
- a non-aqueous solvent a mixture of a high boiling solvent and a low boiling solvent may be used, and the low boiling solvent may be volatilized and removed after coating.
- FIG. 1 is an exploded perspective view showing a configuration example of a non-aqueous gel electrolyte battery.
- FIG. 2 is a schematic perspective view showing one configuration example of a non-aqueous gel electrolyte battery.
- FIG. 3 is a schematic plan view of the positive electrode.
- FIG. 4 is a schematic plan view of the negative electrode.
- FIG. 5 is a schematic cross-sectional view showing a stacked state of a positive electrode and a negative electrode.
- FIG. 6 is a schematic diagram showing a schematic configuration of a single-sided sequential coating apparatus used for producing a nonaqueous gel electrolyte battery.
- FIG. 7 is a schematic diagram showing a schematic configuration of a double-sided simultaneous coating apparatus used for producing a nonaqueous gel electrolyte battery.
- BEST MODE FOR CARRYING OUT THE INVENTION a method for producing a nonaqueous gel electrolyte battery to which the present invention is applied will be described in detail with reference to the drawings.
- the non-aqueous gel electrolyte secondary battery 1 to be manufactured includes, for example, as shown in FIGS. 1 and 2, a positive electrode lead wire 3 and a negative electrode lead wire 4 serving as external connection terminals connected to the wound electrode body 2.
- the spirally wound electrode body 2 is enclosed by an upper laminate film 6 and a lower laminate film 7 which are the exterior members 5 while leading the outside to the outside.
- the wound electrode body 2 is formed by superposing the positive electrode and the negative electrode such that the gel electrolyte layer faces each other, and winding the wound many times in this state.
- the positive electrode has a positive electrode active material layer formed on both sides (or one side) of a positive electrode current collector.
- the positive electrode has a gel electrolyte layer formed on both surfaces of the positive electrode active material layer.
- a metal foil such as an aluminum foil, a nickel foil, and a stainless foil can be used. These metal foils are preferably porous metal foils. Use metal foil as porous metal foil Thereby, the adhesive strength between the current collector and the electrode layer can be increased.
- a porous metal foil a punched metal, an expanded metal, a metal foil having a large number of openings formed by an etching process or the like can be used.
- a metal oxide, a metal sulfide, or a specific polymer material can be used as the positive electrode active material depending on the type of the intended battery. More preferably, L i x M_ ⁇ 2 (M is one kind or more on a transition metal, preferably represents C o, N i or Mn, X depends on battery charge and discharge states, 0. 0 5 ⁇ x ⁇ l It is preferable to use a lithium composite oxide or the like whose main component is). As the transition metal constituting the lithium composite oxide, Co, Ni, Mn and the like are preferable.
- lithium composite oxide L i C o O 2, L i N i 0 2, L i N i y C o ( preparative y) O 2 (where, 0 ⁇ y ⁇ 1), L i Mn 2 ⁇ and the like.
- these positive electrode active materials may be used alone or in combination of two or more.
- such a lithium composite oxide can be produced using a lithium compound and a transition metal compound, for example, a lithium transition metal carbonate, nitrate, sulfate, oxide, hydroxide, or halogen compound as a raw material. it can.
- the lithium salt raw material and the transition metal raw material are each weighed according to a desired composition, sufficiently mixed, and then heated and fired in an oxygen-containing atmosphere in a temperature range of 600 to 100 ° C.
- a lithium composite oxide can be produced.
- the mixing method of each component is not particularly limited, and powdery salts may be mixed in a dry state as they are, or powdery salts may be dissolved in water to form an aqueous solution. You may mix in a state.
- a powder of the positive electrode active material and, if necessary, a conductive agent such as a force pump rack or graphite, or a binder resin such as polyvinylidene fluoride are used.
- a solvent such as dimethylformaldehyde n-methylpyrrolidone is added to prepare a paste-like positive electrode mixture composition, which is applied to the positive electrode current collector and dried.
- a positive electrode for a wound cell can be manufactured.
- the positive electrode 8 has, at one end in the longitudinal direction, a positive electrode current collector exposed portion 12 a where the positive electrode current collector is exposed according to the width of the positive electrode lead wire 3. .
- a positive electrode lead wire is attached to the exposed portion of the positive electrode current collector so as to be led out from one end in the width direction.
- the negative electrode is obtained by forming a negative electrode active material layer on both sides (or one side) of a negative electrode current collector.
- a gel electrolyte layer is formed on both surfaces of the negative electrode active material layer.
- a metal foil such as a copper foil, a nickel foil, and a stainless steel foil can be used. It is preferable that these metal foils are porous metal foils. By making the metal foil a porous metal foil, the adhesive strength between the current collector and the electrode layer can be increased. As such a porous metal foil, a punched metal, an expanded metal, a metal foil having a large number of openings formed by an etching process, or the like can be used.
- lithium metal a lithium alloy such as a lithium aluminum alloy, a material capable of doping and undoping lithium, for example, graphite, non-graphitizable carbon Material, easy black
- lead-based carbon materials include pyrolytic carbons, cokes (for example, pitch coke, needle coats, petroleum coke, etc.), graphite, glassy carbons, and organic polymer compounds.
- Calcined body eg, cellulose, phenol resin, furan resin, etc. calcined at an appropriate temperature
- carbonaceous material such as carbon fiber or activated carbon
- polyacetylene polyaline, polypyrroline, disulfur And polymer electrodes such as metal electrodes.
- these negative electrode active materials may be used alone or in combination of two or more.
- a negative electrode When a negative electrode is manufactured from such a negative electrode active material, for example, in the case of a plate-like lithium metal or lithium alloy, the negative electrode can be manufactured by punching these into a desired shape. Further, a carbon powder and a binder resin such as polyfutsudani vinylidene are uniformly mixed, and a solvent such as dimethylformaldehyde n-methylpyrrolidone is added to prepare a paste-like negative electrode mixture composition. Is applied to a negative electrode current collector and dried, whereby a negative electrode for a wound cell can be manufactured.
- the negative electrode 9 has, at one end in the longitudinal direction, a negative electrode current collector exposed portion 14 a in which the negative electrode current collector is exposed according to the width of the negative electrode lead wire 4. .
- a negative electrode lead wire is attached to the exposed portion of the negative electrode current collector so as to be led out from one end in the width direction.
- FIG. 5 shows the structure of a wound electrode body.
- the wound electrode body 2 includes a positive electrode 8 in which a positive electrode active material layer 22 is coated on a positive electrode current collector 21 and a negative electrode current collector.
- a negative electrode 9 having a negative electrode active material layer 24 coated on a body 23 and a negative electrode active material layer 24 of the negative electrode 9 and a positive electrode active material layer 22 of the positive electrode 8 respectively. It has a coated electrolyte-containing gel electrolyte layer 25 (25a, 25b), and the electrolyte-containing gel electrolyte layers 25a and 25b on the positive electrode 8 side and the negative electrode 9 side overlap each other. It has the structure which was done.
- the electrode assembly with the structure shown in Fig. 5 has a non-aqueous gel by joining the positive lead wire 3 and the negative lead wire 4, and then sealing them with the upper laminate film 6 and the lower laminate film 7. This is a completed electrolyte battery.
- a porous separator for example, a microporous film made of polyethylene or polypropylene
- a porous separator for example, a microporous film made of polyethylene or polypropylene
- a microporous thin film containing polyolefin as a main component can be used.
- polypropylene, polyethylene, or a composite thereof can be used.
- the porosity of the separator is not particularly limited, but the porosity is preferably 30 to 60%.
- the reason for setting the porosity to 30% or more is that if the porosity is lower than 30%, the output characteristics of the battery are excessively deteriorated. Further, the porosity is set to 60% or less because if the porosity is higher than 60%, the mechanical strength is reduced.
- the pore diameter and the film thickness of the pores are not particularly limited, but they prevent internal short-circuiting and block pores. In order to exhibit the shirt-down effect, it is preferable that the pore diameter is 1 m or less.
- a separator having a thickness of about 5 to 35 ⁇ m can be used, but in consideration of the interrelation between the mechanical strength of the film and the electric resistance, the thickness is 7 to 20 ⁇ m. It is preferably about ⁇ m.
- the positive electrode lead wire 3 and the negative electrode lead wire 4 can be made of a metal material such as aluminum, copper, nickel, and stainless steel, and are processed into, for example, a thin plate or mesh.
- the positive electrode lead wire 3 and the negative electrode lead wire 4 are attached to the positive electrode current collector exposed portion and the negative electrode exposed portion, respectively, using a method such as resistance welding or ultrasonic welding.
- the exterior member 5 only needs to have moisture-proof properties.
- a member formed of three layers in which a nylon film, an aluminum foil, and a polyethylene film are laminated in this order can be used.
- the outer member has a bulged shape, leaving an outer edge portion 6 a serving as a fusion portion as the upper laminated film 6 accommodates the wound electrode body 2. It has been.
- the upper laminate film 6 and the lower laminate film 7 have the polyethylene film side as their inner surfaces, and the outer peripheral portion 6 a of the upper laminate film 6.
- the lower laminating film 7 is bonded to the lower laminating film 7 by heat fusion, and sealed under reduced pressure. At this time, the exterior member encapsulates the wound electrode body 2 while leading the positive electrode lead wire 3 and the negative electrode lead wire 4 out of the exterior member.
- the exterior member is not limited to such a configuration.
- the wound electrode body may be formed of a laminar film formed into a substantially bag shape. The structure which is enclosed may be sufficient. In this case, after the wound electrode body is housed inside the exterior member, the negative electrode lead wire and the positive electrode lead wire are led out to the outside from this housing opening and sealed under reduced pressure.
- the contact portion between the exterior member 5 and the positive electrode lead wire 3 and the negative electrode lead wire 4 is made up and down of a polyolefin resin.
- Two fusion films 19 are provided so as to sandwich the positive electrode lead wire 3 and the negative electrode lead wire 4.
- the fusion film 19 may be any film having an adhesive property to the positive electrode lead wire and the negative electrode lead wire.
- the thickness before the thermal fusion is in the range of 20 to 200 ⁇ m. The reason why the thickness before the heat fusion is set to 20 ⁇ m or more is that if the thickness is smaller than this, the brazeability is deteriorated. Conversely, the thickness before heat fusion is set to 200 m or less because if the thickness is too thick, moisture will permeate and it will be difficult to maintain the airtightness inside the battery. is there.
- the fusion film is melted by heat fusion, thereby further improving the adhesion between the positive lead wire and the negative lead wire and the exterior member. be able to.
- the gel electrolyte layer in order to form a gel electrolyte layer on the positive electrode and the negative electrode, an electrolyte is dissolved in a non-aqueous solvent, a polymer material is added thereto, a gel electrolyte composition is prepared, and this is converted into a sol.
- the gel is a semi-solid state having no fluidity. When heated, it becomes a fluid solution (this is called a sol), and when cooled, it can return to the original semi-solid state. A thermoreversible gel that can be made.
- the sol referred to in the present invention is a thermoreversible gel (having cross-linked by weak secondary bonds such as hydrogen bonds, hydrophobic interactions, and coordination bonds to form a network structure). As a result, the secondary bond is broken and the fluidity is reached.
- the gel electrolyte composition may be heated or diluted with a non-aqueous solvent.
- a mixture of a high-boiling non-aqueous solvent and a low-boiling non-aqueous solvent may be used, and the low-boiling solvent may be volatilized and removed after coating.
- an electrolyte salt is dissolved in a high-boiling nonaqueous solvent, and a polymer material and a low-boiling nonaqueous solvent are mixed therein.
- this mixture is heated to form a sol-like mixture, which is coated on the positive electrode and the negative electrode in a heated state, and a part of the mixture is allowed to penetrate into the positive electrode active material layer and the negative electrode active material layer.
- a gel electrolyte layer can be formed on the positive electrode and the negative electrode.
- an electrolyte salt may be dissolved in a low-boiling nonaqueous solvent, and a polymer material and a high-boiling nonaqueous solvent may be mixed therein.
- the electrolyte salt may be dissolved in a mixed solvent of a solvent and a low-boiling nonaqueous solvent, and a polymer material may be mixed with the electrolyte salt.
- the heating temperature is preferably from 35 to 95 ° C, particularly preferably from 40 to 85 ° C.
- the temperature is too high, the low-boiling nonaqueous solvent tends to volatilize before being applied to the electrode, making uniform application impossible, and also partially decomposing the electrolytic solution, resulting in a desired battery. If the temperature is too low, the electrolyte layer on the electrode will not be obtained. This is because not only is the penetration of the electrolyte layer insufficient, but also the productivity of the electrolyte layer is significantly reduced due to the slow penetration of the electrolyte layer into the electrode.
- the viscosity of the sol mixture when applied on the electrode is preferably 1 to 5 Ocp, and particularly preferably 1 to 2 Ocp. If the viscosity is too high, the penetration of the electrolyte layer into the electrode will be insufficient, and if the viscosity is too low, uniform application will not be possible.
- the drying temperature for removing the low boiling non-aqueous solvent is not particularly limited as long as it is lower than the boiling point of the high boiling non-aqueous solvent.
- high boiling non-aqueous solvents such as ethylene carbonate, propylene carbonate, butylene carbonate, ⁇ -butyrolactone, 2,4-difluoroanisole, and 2,6-difluoroanisole Loanisole, 4-promoveratrol, etc.
- a low boiling non-aqueous solvent for example, ⁇ -valerolatatone, ethoxyethoxy, tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxane, methyl acetate
- a low boiling non-aqueous solvent for example, ⁇ -valerolatatone, ethoxyethoxy, tetrahydrofuran, 2-methyltetrahydrofuran, 1,3-dioxane, methyl acetate
- methyl propylene, dimethinole carbonate, getyl carbonate, ethyl methyl carbonate and the like can be used.
- the low non-aqueous boiling point solvent is preferably a non-aqueous solvent having a boiling point at normal pressure of 110 ° C. or lower. This is because when the gel electrolyte composition is applied on the electrode and only the low-boiling nonaqueous solvent is dried and removed, if the nonaqueous solvent has a boiling point exceeding 11 o ° c, the drying temperature becomes too high. This is because the electrolyte salt contained in the gel electrolyte composition is thermally decomposed.
- a high boiling non-aqueous solvent is used in combination with the above low boiling non-aqueous solvent. Those which are selected and exhibit a boiling point 50 ° C.
- the high boiling non-aqueous solvent is partially removed at the same time when the low boiling non-aqueous solvent is dried and removed.
- an electrolyte salt for example, L i PF 6, L i A s FL i BFL i CIOL i CF 3 SO 3, L i (CF 3 SO 2) 2 N, L i a lithium salt such as C 4F 9 S_ ⁇ 3 alone young properly may be used as a mixture of two or more.
- the addition amount of the electrolyte salt may be adjusted so that the molar concentration in the non-aqueous electrolyte in the gel electrolyte is 0.10 to 2.Omol / 1 so that good ionic conductivity is obtained. preferable.
- polyvinylidene fluoride and a copolymer of polyvinylidene fluoride can be used as a polymer material used for the gel electrolyte.
- Fluoropropylene / tetrafluoroethylene and the like can be mentioned.
- the polymer material used for the gel electrolyte for example, a copolymer of polyacrylonitrile and polyatalonitrile can be used.
- the copolymerized monomer include vinyl acetate, methyl methacrylate, butyl methacrylate, methyl acrylate, butyl acrylate, itaconic acid, hydrogenated methyl acrylate, and hydrogenated products.
- Tilacrylate, atarylamide, vinyl chloride, pinylidene fluoride, vinylidene chloride and the like can be mentioned.
- acrylonitrile butadiene rubber acrylonitrile butadiene rubber, acrylonitrile butadiene styrene resin, acrylonitrile chlorinated polyethylene Pyrene diene styrene resin, acrylonitrile chloride chloride resin, acrylonitrile methacrylate resin, acrylonitrile acryl acrylate resin and the like can be used.
- a copolymer of polyethylene oxide and polyethylene oxide can be used as the polymer material used for the gel electrolyte.
- the copolymerizable monomer include polypropylene oxide, methyl methacrylate, butyl methacrylate, methyl atalinoleate, and butyl acrylate.
- polyether-modified siloxane and a copolymer thereof can be used as the polymer material used for the gel electrolyte.
- these can be used alone or in combination of two or more.
- the polymer material in order to obtain a good gel electrolyte, it is preferable to add the polymer material in an amount of, for example, about 5 to 25% by weight based on the weight of the gel electrolyte layer. It is particularly preferably 8 to 20%.
- the ratio of the low boiling non-aqueous solvent to the high boiling non-aqueous solvent is preferably, for example, about 1 to 3, and particularly preferably 1.2 to 2. This is because if the amount of the polymer material is too low, the non-aqueous solvent in the gel electrolyte layer cannot be sufficiently retained, and if the amount of the polymer material is too large, the gel electrolyte layer is transferred from the gel electrolyte layer to the electrode.
- the impregnation of the non-aqueous solvent and electrolyte salt will be insufficient. Also, if the ratio of the low boiling non-aqueous solvent to the high boiling non-aqueous solvent is too small, the non-aqueous solvent and the electrolyte salt are also insufficiently soaked from the gel electrolyte layer into the electrode, and the high boiling If the ratio of the low boiling non-aqueous solvent to the aqueous solvent is too large, the low boiling non-aqueous solvent may This is because the high boiling non-aqueous solvent is also dried together.
- the gel electrolyte layer it is also effective to form the sol of the gel electrolyte composition and to heat the positive electrode or the negative electrode to which the gel electrolyte composition is applied to a temperature exceeding room temperature.
- the heating temperature of the positive electrode and the negative electrode is preferably 35 to 150 ° C, more preferably 50 to 150 ° C. 20 ° C.
- the configuration of the target non-aqueous gel electrolyte battery is, as described above, other components (material, battery structure) except that the electrolyte-containing gel layer is coated on the positive electrode and the negative electrode. Are the same as those of conventional non-aqueous gel electrolyte batteries.
- a lithium composite oxide represented by the general formula Li M x O y (where M, x, and y represent the metal, metal composition ratio, and oxygen composition ratio, respectively)
- An active material and a conductive agent such as acetylene black are dispersed in a solvent together with a binder such as polyvinylidene fluoride in a solvent.
- a thin film is applied to a positive electrode current collector such as an aluminum foil. What was obtained by forming a material layer can be used.
- the positive electrode active material layer may be formed on one side or both sides of the positive electrode current collector. Further, in order to obtain a desired density of the positive electrode active material layer, press treatment may be performed as necessary.
- a dispersion is made by dispersing a carbon material that absorbs lithium ions (for example, carbon powder with low crystallization or graphite powder with high crystallization) in a solvent together with a binder such as polyvinylidene fluoride. Transfer the solution to a negative electrode A material obtained by forming a negative electrode active material layer by coating and drying a thin film on an electric conductor can be used.
- a carbon material that absorbs lithium ions for example, carbon powder with low crystallization or graphite powder with high crystallization
- a binder such as polyvinylidene fluoride
- the negative electrode active material layer may be formed on one side or both sides of the negative electrode current collector.
- a pressing treatment may be performed as necessary.
- the electrolyte solution-containing gel layer is formed by depositing a composition for forming an electrolyte solution-containing gel layer comprising a resin capable of forming a gel matrix, a solvent for swelling the resin, and an electrolyte.
- the application of the electrolyte solution-containing gel layer is generally performed by heating to liquefy because the composition for forming an electrolyte solution-containing gel layer is in a jelly state at room temperature and has insufficient fluidity.
- a solvent having a boiling point lower than the solvent for dissolving the electrolyte is used as the diluting solvent in order to improve the penetration of the gel into the electrode (that is, the penetration of the electrolyte into the electrode active material layer). Can be used.
- the heating temperature of the composition for forming an electrolyte solution-containing gel layer at the time of applying the electrolyte solution-containing gel layer is not lower than the temperature at which the composition becomes a liquid state, and most of the solvents contained therein.
- the temperature is lower than the boiling point of the low boiling solvent.
- Examples of the resin used for the composition for forming an electrolyte solution-containing gel layer include polyvinylidene fluoride, a hexafluoropropylene-vinylidene fluoride copolymer, and polyatarilonitrile.
- the solvent examples include ⁇ -butyrolataton, ethylene carbonate, propylene carbonate, dimethyl carbonate, getyl carbonate, and ethyl methyl carbonate.
- the electrolyte lithium hexafluorophosphate and lithium perchlorate are used.
- lithium salts such as lithium tetrafluoroborate.
- a positive electrode is manufactured by coating a positive electrode active material layer on a positive electrode current collector.
- an electrolyte-containing gel layer is applied on the positive electrode active material layer of the positive electrode while heating the positive electrode to a temperature exceeding room temperature.
- the electrolytic solution-containing gel layer can be applied on one side or on both sides one by one by a one-side sequential coating apparatus as shown in FIG. That is, the electrode 32 unwound from the unwinding roll 31 is heated by the electrode preheating device 33, and is formed on the electrode active material layer on one side thereof from the coater head 34 to form an electrolyte-containing gel layer.
- the composition is applied.
- the applied composition for forming an electrolyte solution-containing gel layer is dried when passing through a dryer 35 to form an electrolyte solution-containing gel layer.
- the electrode 32 on which the electrolyte-containing gel layer is formed is wound up on a winding roll 36.
- the electrolyte-containing gel layer can be simultaneously coated on both sides by a simultaneous double-side coating device as shown in FIG. That is, the electrode 42 unwound from the unwinding roll 41 is heated by the electrode preheating device 43, and contains the electrolytic solution from the coater head 44 on the electrode active material layers on both surfaces thereof.
- the composition for forming a gel layer is applied simultaneously.
- the applied composition for forming an electrolyte-containing gel layer is dried when passing through a drier 45 to form an electrolyte-containing gel layer.
- the electrode 42 on which the electrolyte-containing gel layer is formed is wound up on a winding roll 46.
- the pressing can be performed by a general press roll device after the formation of the electrode active material layer and before the formation of the electrolyte-containing gel layer.
- a negative electrode is prepared by applying a negative electrode active material layer on the negative electrode current collector in the same manner as in the case of preparing the positive electrode. Then, while heating the negative electrode to a temperature exceeding room temperature, the negative electrode An electrolyte-containing gel layer is applied on the material layer.
- Incorporation of the obtained electrode assembly for the manufacture of a finished battery product can be performed by slitting the electrode after the application of the electrolyte-containing gel layer, or conversely, by slitting the electrode and then removing the electrolyte-containing gel.
- One electrode is slit after applying the layer containing the electrolytic solution, and the other electrode is slit and then the gel containing the electrolytic solution is applied by combining the two methods. It can be carried out by a method of coating and incorporating a layer. Alternatively, the method can be performed by applying an electrolyte solution-containing gel layer on only one side of the electrode and slitting the coating, thereafter applying the electrolyte solution-containing gel layer on the other side of the electrode, and then incorporating the same.
- the battery elements are overlapped so that the electrode layers of both electrodes face each other.
- a method of overlapping there are a method of overlapping electrodes cut to a desired size, and a method of winding the overlapped electrodes.
- the laminating film at this time a laminated film of aluminum or the like can be used.
- the method of preheating the electrode before applying the composition for forming an electrolyte-containing gel layer is not particularly limited. A method of passing a temperature-controlled roll, a method of blowing temperature-controlled air, a method of providing an infrared lamp, and the like. Are listed.
- the resultant positive electrode mixture slurry one was uniformly applied to both surfaces of an aluminum foil having a thickness of 2 0 mu m as a positive electrode current collector, dried, positive electrode strip was compression molded by a roller press machine Was prepared.
- the negative electrode To produce the negative electrode, first, 90% by weight of graphite having an average particle size of 20 ⁇ m and 10% by weight of polyfuzivinylidene as a binder were mixed to prepare a negative electrode mixture. Then, this negative electrode mixture was dispersed in n-methylpyrrolidone to form a slurry (paste-like).
- the obtained negative electrode mixture slurry is uniformly coated on both sides of a 15 / m-thick copper foil serving as a negative electrode current collector, dried, and then compression-molded by a roller press to form a strip-shaped negative electrode.
- the positive electrode was spot-welded with a positive electrode lead wire made of reticulated aluminum, and the negative electrode was spot-welded with a negative electrode lead wire made of reticulated copper to form external connection terminals.
- a mixture of ethylene carbonate, pyrene carbonate, and y-butyrolactone in a weight ratio of 4: 3: 3 is added to a mixed solvent in a concentration of 1.2 mol Zl. was dissolved i PF 6, the mixture (a) and dimethyl carbonate (B), a copolymer of hexa full O b propylene to vinylidene fluoride and (C), the BZA weight ratio 1. 8, CZA The mixture was mixed so that the weight ratio became 15%, uniformly dispersed with a homogenizer, and then heated and stirred at 75 ° C.
- the stirring was stopped to obtain a sol-like mixture, which was heated to 75 ° C and uniformly applied to both surfaces of the above-described positive electrode and negative electrode using a doctor blade. Thereafter, the methyl carbonate was removed by drying, and a gel electrolyte layer was formed on each of the surfaces of the positive electrode and the negative electrode.
- the viscosity of the sol mixture at this time was 7 cp.
- the negative electrode and the positive electrode prepared as described above are laminated via a propylene microporous thin film (trade name: Cell Guard 3501, manufactured by Separation Pro-Products Japan) serving as a separator.
- a wound electrode body was produced.
- the wound electrode body thus obtained was sealed under reduced pressure in a laminated film while leading the negative electrode lead wire and the positive electrode lead wire to the outside, and a nonaqueous gel electrolyte secondary electrode having a thickness of 3.7 mm was obtained.
- a pond was made.
- Experimental Examples 2 to 9 Experimental examples 2 to 9 were prepared in the same manner as in Experimental example 1 except that the heating and stirring, the application temperature, and the viscosity during application when forming the gel electrolyte layer were changed as shown in Table 1.
- the weight ratio B / A and the weight ratio CZA were changed as shown in Table 2 and mixed and prepared. It was 6.
- the suspension of the composition of the positive electrode active material layer shown in Table 4 was mixed for 4 hours by a disper, and this was pattern-coated on both sides of a 20 ⁇ thick aluminum foil using the apparatus shown in FIG.
- the coating pattern was repeated with a coating length of 160 mm on both sides and an uncoated part length of 3 Omm, and the start and end positions of coating on both sides were controlled to coincide with each other.
- LiCoO2 (Average particle size 10 ⁇ m) 1 0 0
- the positive electrode raw material after N-methyl-1-pyrrolidone 100 was coated on both sides was pressed at a linear pressure of 300 kg / cm.
- the thickness of the positive electrode and the density of the positive electrode active material layer were 100 ⁇ m and 3.45 g Z cc after pressing, respectively.
- the suspension of the negative electrode active material layer composition shown in Table 5 was mixed with a disper for 4 hours, and this was pattern-coated on one surface of a 10- ⁇ m-thick copper foil with the apparatus shown in FIG.
- the coating pattern is a repetition of a coating length of 160 mm and an uncoated portion length of 30 mm.
- Negative active material layer composition part Man-made graphite (average particle size 20 ⁇ )
- Polyvinylidene fluoride (average molecular weight 300,000) 1 5
- the negative electrode raw material after one-side application of ⁇ -methyl-1-pyrrolidone 2000 was pressed at a linear pressure of 300 kg Zcm.
- the negative electrode thickness and the negative electrode active material layer density were 50 ⁇ m and 1.30 gZ cc after pressing, respectively.
- the electrolytic solution-containing gel layer forming composition shown in Table 6 was mixed with a disper for 1 hour while heating at 70 ° C, and this was mixed with an apparatus shown in Fig. 6 so that the layer thickness became 20 // m.
- a pattern was applied onto the negative electrode active material layer on one side of the negative electrode, and a pattern was applied onto the positive electrode active material layer on both sides of the positive electrode using the apparatus shown in Fig. 7 to a coating thickness of 20 ⁇ m. .
- the dryer was adjusted so that substantially only dimethyl carbonate was evaporated.
- the positive electrode and the negative electrode were heated to the temperatures shown in Table 7 by setting the electrode preheating device to a predetermined temperature when applying the electrolyte-containing gel layer.
- the negative electrode material coated with the electrolyte-containing gel layer was cut into a 4 Omm width to prepare a pancake of a strip electrode.
- the positive electrode raw material was cut into a width of 38 mm to prepare a pancake of a strip-shaped electrode.
- lead wires were welded to the positive and negative electrodes, respectively, and bonded together so that the electrode active material layers faced each other, pressed, and sent to the assembled portion to form a battery element. Then, the battery element was sandwiched so as to be covered with the laminate film, and the film was welded to produce a battery as shown in FIG.
- Electrode active material layer is peeled off from the current collector.
- the battery was left for 12 hours in a general environment (25 ° C, 60 RH%), charged at a constant current of 50 mA, and further charged for 1 hour under a constant voltage condition of 4.2 V. Discharge was performed at a current of 50 mA at a 3.0 V cut, the battery capacity was determined, and the ratio to the design capacity was calculated. With or without or without
- Electrode preheating device Electrode temperature (° C) Permeation capacity ratio Experimental example Set temperature (° C) Positive electrode-negative electrode (%)
- the preferred range of the preheating temperature of the electrolyte-containing gel layer coating ⁇ front electrode 3 5 ⁇ 1 5 0 ° C
- a more preferred range is 5 0 ⁇ 1 2 0 ° C this the force s I force, Ru.
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Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/529,890 US6632256B1 (en) | 1998-09-01 | 1999-09-01 | Method for manufacturing a non-aqueous-gel-electrolyte battery |
EP99940611A EP1041658B1 (en) | 1998-09-01 | 1999-09-01 | Method for producing nonaqueous gel electrolyte battery |
KR1020007004714A KR100731240B1 (ko) | 1998-09-01 | 1999-09-01 | 비수계 겔 전해질 전지의 제조 방법 |
JP2000568136A JP4228541B2 (ja) | 1998-09-01 | 1999-09-01 | 非水系ゲル電解質電池の製造方法 |
DE69941809T DE69941809D1 (de) | 1998-09-01 | 1999-09-01 | Verfahren zur herstellung einer batterie mit nichtwässrigem gelelektrolyt |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24646398 | 1998-09-01 | ||
JP10/246463 | 1998-09-01 |
Publications (1)
Publication Number | Publication Date |
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WO2000013252A1 true WO2000013252A1 (fr) | 2000-03-09 |
Family
ID=17148808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/004746 WO2000013252A1 (fr) | 1998-09-01 | 1999-09-01 | Procede de production d'un element electrolytique en gel non aqueux |
Country Status (7)
Country | Link |
---|---|
US (1) | US6632256B1 (ja) |
EP (1) | EP1041658B1 (ja) |
JP (1) | JP4228541B2 (ja) |
KR (1) | KR100731240B1 (ja) |
CN (1) | CN1196217C (ja) |
DE (1) | DE69941809D1 (ja) |
WO (1) | WO2000013252A1 (ja) |
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WO2003017410A1 (en) * | 2001-08-09 | 2003-02-27 | Toray Engineering Co., Ltd. | Manufacturing method for secondary battery and manufacturing apparatus for secondary battery |
JP2004079515A (ja) * | 2002-06-19 | 2004-03-11 | Sharp Corp | リチウムポリマー二次電池とその製造方法 |
CN103107362A (zh) * | 2012-12-28 | 2013-05-15 | 青岛润鑫伟业科贸有限公司 | 一种锂离子电池电解液 |
KR20210043712A (ko) | 2018-09-14 | 2021-04-21 | 가부시끼가이샤 구레하 | 수지 분산 전해액, 폴리머 겔 전해질 및 이의 제조방법, 및 이차전지 및 이의 제조방법 |
JP2020092057A (ja) * | 2018-12-07 | 2020-06-11 | 株式会社半導体エネルギー研究所 | 二次電池の製造方法 |
JP7274855B2 (ja) | 2018-12-07 | 2023-05-17 | 株式会社半導体エネルギー研究所 | 二次電池の製造方法 |
JP7448657B2 (ja) | 2020-07-02 | 2024-03-12 | 富士フイルム株式会社 | 全固体二次電池用シート及び全固体二次電池の製造方法、並びに、全固体二次電池用シート及び全固体二次電池 |
JPWO2022004884A1 (ja) * | 2020-07-02 | 2022-01-06 | ||
WO2022004884A1 (ja) * | 2020-07-02 | 2022-01-06 | 富士フイルム株式会社 | 全固体二次電池用シート及び全固体二次電池の製造方法、並びに、全固体二次電池用シート及び全固体二次電池 |
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Publication number | Publication date |
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EP1041658A4 (en) | 2005-03-30 |
KR100731240B1 (ko) | 2007-06-22 |
CN1277740A (zh) | 2000-12-20 |
EP1041658A1 (en) | 2000-10-04 |
CN1196217C (zh) | 2005-04-06 |
KR20010015794A (ko) | 2001-02-26 |
DE69941809D1 (de) | 2010-01-28 |
JP4228541B2 (ja) | 2009-02-25 |
US6632256B1 (en) | 2003-10-14 |
EP1041658B1 (en) | 2009-12-16 |
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