WO2023189762A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2023189762A1
WO2023189762A1 PCT/JP2023/010712 JP2023010712W WO2023189762A1 WO 2023189762 A1 WO2023189762 A1 WO 2023189762A1 JP 2023010712 W JP2023010712 W JP 2023010712W WO 2023189762 A1 WO2023189762 A1 WO 2023189762A1
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Prior art keywords
positive electrode
negative electrode
secondary battery
active material
coating layer
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PCT/JP2023/010712
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English (en)
Japanese (ja)
Inventor
陽介 河野
亜未 大沼
武夫 浅沼
淳史 黄木
真純 福田
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株式会社村田製作所
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Publication of WO2023189762A1 publication Critical patent/WO2023189762A1/fr

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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
    • 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
    • H01M10/0566—Liquid materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • 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
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/426—Fluorocarbon polymers
    • 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
    • H01M50/431—Inorganic material
    • H01M50/434—Ceramics
    • 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
    • H01M50/443—Particulate material
    • 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
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/451—Separators, membranes or diaphragms characterised by the material having a layered structure comprising layers of only organic material and layers containing inorganic material
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present technology relates to secondary batteries.
  • secondary batteries are being developed as a power source that is small and lightweight and provides high energy density.
  • This secondary battery includes a positive electrode, a negative electrode, a separator, and an electrolyte, and various studies have been made regarding the configuration of the secondary battery.
  • a protective layer containing an insulating inorganic compound is provided on the surface of the positive electrode, and the surface resistance of the positive electrode is 0.5 ⁇ to 40 ⁇ (see, for example, Patent Document 1).
  • a secondary battery that can provide excellent battery characteristics is desired.
  • a secondary battery includes a positive electrode including a positive electrode active material layer, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte.
  • the positive electrode active material layer includes a positive electrode active material and a first binder.
  • the separator includes a porous layer and a coating layer disposed between the porous layer and the positive electrode active material layer, and the coating layer includes a plurality of insulating particles and a second binder. A portion of the covering layer is not adjacent to the porous layer and is adjacent to the positive electrode active material layer.
  • a separator including a porous layer and a coating layer is disposed between a positive electrode and a negative electrode, and the positive active material layer of the positive electrode is connected to the positive active material and the first
  • a coating layer disposed between the porous layer and the positive electrode active material layer includes a plurality of insulating particles and a second binder, and a part of the coating layer includes a binder. Since it is not adjacent to the porous layer and is adjacent to the positive electrode active material layer, excellent battery characteristics can be obtained.
  • FIG. 1 is a perspective view showing the configuration of a secondary battery in an embodiment of the present technology.
  • FIG. 2 is a cross-sectional view showing the configuration of the battery element shown in FIG. 1.
  • FIG. 3 is a plan view showing the configuration of the positive electrode shown in FIG. 2.
  • FIG. 3 is a plan view showing the configuration of the negative electrode shown in FIG. 2.
  • FIG. 2 is a cross-sectional view showing the configuration of a battery element after a heating test of a secondary battery.
  • FIG. 2 is a perspective view for explaining a method for manufacturing a secondary battery.
  • FIG. 2 is a block diagram showing the configuration of an application example of a secondary battery.
  • Secondary battery 1-1 Overall composition 1-2. Physical properties 1-3. Operation 1-4. Manufacturing method 1-5. Action and effect 2. Modification example 3. Applications of secondary batteries
  • the secondary battery described here is a secondary battery whose battery capacity is obtained by utilizing the intercalation and desorption of electrode reactants, and includes a positive electrode, a negative electrode, a separator, and an electrolyte.
  • the charging capacity of the negative electrode is larger than the discharging capacity of the positive electrode. That is, the electrochemical capacity per unit area of the negative electrode is set to be larger than the electrochemical capacity per unit area of the positive electrode. This is to prevent electrode reactants from depositing on the surface of the negative electrode during charging.
  • a secondary battery whose battery capacity is obtained by utilizing intercalation and desorption of lithium is a so-called lithium ion secondary battery.
  • lithium ion secondary battery lithium is intercalated and released in an ionic state.
  • FIG. 1 shows a perspective configuration of a secondary battery
  • FIG. 2 shows a cross-sectional configuration of a battery element 20 shown in FIG. 3 shows the planar structure of the positive electrode 21 shown in FIG. 2
  • FIG. 4 shows the planar structure of the negative electrode 22 shown in FIG.
  • FIG. 1 shows a state in which the exterior film 10 and the battery element 20 are separated from each other.
  • this secondary battery includes an exterior film 10, a battery element 20, a plurality of positive electrode terminals 31, a plurality of negative electrode terminals 32, a positive electrode lead 41, and a negative electrode lead 42. , sealing films 51 and 52.
  • the secondary battery described here uses the exterior film 10 as an exterior member for accommodating the battery element 20, the plurality of positive electrode terminals 31, and the plurality of negative electrode terminals 32, so it is of the so-called laminate film type. This is a secondary battery.
  • the exterior film 10 is a flexible or pliable film-like exterior member, and as shown in FIG. are doing. Thereby, the exterior film 10 accommodates a positive electrode 21, a negative electrode 22, a separator 23, and an electrolytic solution, which will be described later.
  • the exterior film 10 is a single film-like member, and is folded in the folding direction F.
  • This exterior film 10 is provided with a recessed portion 10U (so-called deep drawn portion) for accommodating the battery element 20.
  • the exterior film 10 is a three-layer laminate film in which a fusing layer, a metal layer, and a surface protection layer are laminated in this order from the inside, and when the exterior film 10 is folded, they face each other. The outer peripheral edges of the fusion layers are fused to each other.
  • the adhesive layer contains a polymer compound such as polypropylene.
  • the metal layer contains a metal material such as aluminum.
  • the surface protective layer contains a polymer compound such as nylon.
  • the structure (number of layers) of the exterior film 10 is not particularly limited and may be one or two layers, or four or more layers.
  • the battery element 20 is a power generating element that includes a positive electrode 21, a negative electrode 22, a separator 23, and an electrolyte (not shown), and is housed inside the exterior film 10. has been done.
  • the battery element 20 is a so-called laminated electrode body. That is, the positive electrode 21 and the negative electrode 22 are alternately stacked with the separator 23 in between.
  • the numbers of positive electrodes 21, negative electrodes 22, and separators 23 are not particularly limited and can be set arbitrarily.
  • the positive electrode 21 includes a positive electrode current collector 21A and a positive electrode active material layer 21B. In FIG. 3, the positive electrode active material layer 21B is shaded.
  • the positive electrode current collector 21A has a pair of surfaces on which the positive electrode active material layer 21B is provided.
  • the positive electrode current collector 21A includes a conductive material such as a metal material, and a specific example of the conductive material is aluminum.
  • the positive electrode active material layer 21B contains a positive electrode active material and a positive electrode binder. However, the positive electrode active material layer 21B may further contain one or more types of other materials such as a positive electrode conductive agent.
  • the positive electrode active material layer 21B is provided on both sides of the positive electrode current collector 21A.
  • the positive electrode active material layer 21B may be provided only on one side of the positive electrode current collector 21A on the side where the positive electrode 21 faces the negative electrode 22.
  • the method for forming the positive electrode active material layer 21B is not particularly limited, and specifically, a coating method or the like is used.
  • the positive electrode active material contains one or more materials capable of intercalating and deintercalating lithium.
  • the positive electrode active material contains a lithium-containing compound.
  • This lithium-containing compound is a compound containing lithium and one or more transition metal elements as constituent elements, and may further contain one or more other elements as constituent elements.
  • the type of other element is not particularly limited as long as it is an element other than lithium and transition metal elements, but specifically, it is an element belonging to Groups 2 to 15 in the long period periodic table.
  • the type of lithium-containing compound is not particularly limited, but specifically includes oxides, phosphoric acid compounds, silicic acid compounds, and boric acid compounds.
  • oxides include LiNiO 2 , LiCoO 2 , LiCo 0.98 Al 0.01 Mg 0.01 O 2 , LiNi 0.5 Co 0.2 Mn 0.3 O 2 , LiNi 0.8 Co 0.15 Al 0.05 O 2 , LiNi 0.3 3 Co 0.33 Mn 0.33 O 2 , Li 1.2 Mn 0.52 Co 0.175 Ni 0.1 O 2 , Li 1.15 (Mn 0.65 Ni 0.22 Co 0.13 )O 2 and LiMn 2 O 4 .
  • phosphoric acid compounds include LiFePO 4 , LiMnPO 4 , LiFe 0.5 Mn 0.5 PO 4 and LiFe 0.3 Mn 0.7 PO 4 .
  • the positive electrode binder is a first binder that binds the positive electrode active materials and the like to each other.
  • the laminate 20Z is hot-pressed in a state where the positive electrode 21 (positive electrode active material layer 21B) is adjacent to the separator 23 (positive electrode side coating layer 23B described later).
  • the laminate 20Z is being pressed while being heated. Thereby, the positive electrode active material layer 21B is in close contact with the positive electrode side coating layer 23B.
  • This positive electrode binder contains one or more of materials such as synthetic rubber and polymer compounds.
  • synthetic rubber include fluorine rubber and ethylene propylene diene.
  • polymer compound include polyvinylidene fluoride, polyimide, and carboxymethyl cellulose.
  • the positive electrode binder contains the same material as the constituent material of the separator binder described below. This is because the constituent materials of the positive electrode binder and the separator binder are common to each other, so that the positive electrode binder easily adheres to the separator binder.
  • the positive electrode binder preferably contains one or both of a vinylidene fluoride homopolymer and a vinylidene fluoride copolymer. This is because when the constituent materials of the positive electrode binder and the constituent materials of the separator binder are common to each other, the positive electrode binder is likely to adhere sufficiently to the separator binder.
  • the positive electrode binder is likely to be thermally fused to the separator binder, especially during heating of the secondary battery (after a heating test of the secondary battery described below).
  • the homopolymer of vinylidene fluoride is so-called polyvinylidene fluoride.
  • a copolymer of vinylidene fluoride is a compound in which vinylidene fluoride and other monomers are copolymerized with each other. Specific examples of other monomers include monomers such as hexafluoropropylene. Any one type or two or more types.
  • the copolymerization amount (% by weight) of other monomers can be set arbitrarily.
  • the positive electrode conductive agent contains one or more of conductive materials such as carbon materials, metal materials, and conductive polymer compounds.
  • conductive materials such as carbon materials, metal materials, and conductive polymer compounds.
  • Specific examples of carbon materials include graphite, carbon black, acetylene black, and Ketjen black.
  • the positive electrode current collector 21A since a part of the positive electrode current collector 21A protrudes, the positive electrode current collector 21A has a portion (hereinafter referred to as (referred to as "the protrusion of the positive electrode current collector 21A"). Since the positive electrode active material layer 21B is not provided on the protruding portion of the positive electrode current collector 21A, the protruding portion of the positive electrode current collector 21A functions as the positive electrode terminal 31. Note that details of the positive electrode terminal 31 will be described later.
  • the negative electrode 22 includes a negative electrode current collector 22A and a negative electrode active material layer 22B. In FIG. 4, the negative electrode active material layer 22B is shaded.
  • the negative electrode current collector 22A has a pair of surfaces on which the negative electrode active material layer 22B is provided.
  • This negative electrode current collector 22A includes a conductive material such as a metal material, and a specific example of the conductive material is copper.
  • the negative electrode active material layer 22B contains a negative electrode active material. However, the negative electrode active material layer 22B may further contain one or more of other materials such as a negative electrode binder and a negative electrode conductive agent.
  • the negative electrode active material layer 22B is provided on both sides of the negative electrode current collector 22A.
  • the negative electrode active material layer 22B may be provided only on one side of the negative electrode current collector 22A on the side where the negative electrode 22 faces the positive electrode 21.
  • the method for forming the negative electrode active material layer 22B is not particularly limited, but specifically, any one of a coating method, a gas phase method, a liquid phase method, a thermal spraying method, a firing method (sintering method), etc. There are two or more types.
  • the negative electrode active material contains one or more materials capable of intercalating and deintercalating lithium.
  • the negative electrode active material contains one or both of a carbon material and a metal-based material. This is because high energy density can be obtained.
  • carbon materials include easily graphitizable carbon, non-graphitizable carbon, and graphite (natural graphite and artificial graphite).
  • a metal-based material is a material containing as a constituent element one or more of metal elements and metalloid elements that can form an alloy with lithium.
  • Specific examples of the metal elements and metalloid elements are: , silicon and tin.
  • This metallic material may be a single substance, an alloy, a compound, a mixture of two or more types thereof, or a material containing phases of two or more types thereof.
  • Specific examples of metal-based materials include TiSi 2 and SiO x (0 ⁇ x ⁇ 2, or 0.2 ⁇ x ⁇ 1.4).
  • negative electrode binder Details regarding the negative electrode binder are the same as those regarding the positive electrode binder, except that the specific example of the synthetic rubber may further be styrene-butadiene rubber. Details regarding the negative electrode conductive agent are the same as those regarding the positive electrode conductive agent.
  • the protrusion of the negative electrode current collector 22A since a part of the negative electrode current collector 22A protrudes, the part of the negative electrode current collector 22A that protrudes outward from the negative electrode active material layer 22B (hereinafter referred to as (referred to as "the protrusion of the negative electrode current collector 22A"). Since the negative electrode active material layer 22B is not provided on the protruding portion of the negative electrode current collector 22A, the protruding portion of the negative electrode current collector 22A functions as the negative electrode terminal 32. Note that details of the negative electrode terminal 32 will be described later.
  • the separator 23 is disposed between the positive electrode 21 and the negative electrode 22, and allows lithium ions to pass through while preventing contact (short circuit) between the positive electrode 21 and negative electrode 22.
  • the positive electrodes 21 and the negative electrodes 22 are alternately stacked with the separators 23 in between, so the battery element 20 includes a plurality of separators 23.
  • the separator 23 includes a porous layer 23A, a positive electrode side coating layer 23B, and a negative electrode side coating layer 23C.
  • the porous layer 23A has a plurality of pores to allow lithium ions to pass through, and has a pair of surfaces on which the positive electrode side coating layer 23B and the negative electrode side coating layer 23C are provided.
  • This porous layer 23A contains an insulating material such as a polymer compound, and a specific example of the insulating material is polyethylene.
  • the positive electrode side coating layer 23B is disposed between the porous layer 23A and the positive electrode 21 (positive electrode active material layer 21B), and is adjacent to the positive electrode active material layer 21B.
  • This positive electrode side coating layer 23B includes a plurality of insulating particles and a separator binder, and the separator binder is a second binder that binds the plurality of insulating particles and the like to each other.
  • the plurality of insulating particles function to promote heat dissipation during heat generation and heating of the secondary battery. This improves the heat resistance of the secondary battery, thereby improving safety.
  • Each of the plurality of insulating particles contains one or more types of insulating materials such as inorganic materials, and specific examples of the insulating materials include metal hydroxides, metal oxides, and metal nitrides, etc. This is because sufficient heat dissipation properties can be obtained in the positive electrode side coating layer 23B. More specifically, metal hydroxides include magnesium hydroxide and aluminum hydroxide. Metal oxides include magnesium oxide, aluminum oxide, titanium oxide, silicon oxide, and zirconium oxide. Metal nitrides include aluminum nitride.
  • the separator binder is a material that holds a plurality of insulating particles, and contains one or more types of polymer compounds. Details regarding the polymer compound are the same as those regarding the polymer compound contained in the positive electrode binder.
  • the separator binder preferably contains the same material as the constituent material of the positive electrode binder, and more specifically, a vinylidene fluoride homopolymer (polyvinylidene fluoride). and a copolymer of vinylidene fluoride, or both thereof. This is because the separator binder easily adheres sufficiently to the positive electrode binder.
  • the separator binder is likely to be thermally fused to the positive electrode binder, particularly during heating of the secondary battery (after a heating test of the secondary battery described below).
  • the negative electrode side coating layer 23C is disposed between the porous layer 23A and the negative electrode 22 (negative electrode active material layer 22B), and is adjacent to the negative electrode active material layer 22B.
  • This negative electrode side coating layer 23C contains a separator binder, and the details regarding the separator binder are as described above. Note that the negative electrode side coating layer 23C may include a plurality of insulating particles or may not include the plurality of insulating particles.
  • electrolyte is a liquid electrolyte. This electrolytic solution is impregnated into each of the positive electrode 21, negative electrode 22, and separator 23, and contains a solvent and an electrolyte salt.
  • the solvent contains one or more types of non-aqueous solvents (organic solvents), and the electrolytic solution containing the non-aqueous solvent is a so-called non-aqueous electrolytic solution.
  • This nonaqueous solvent includes esters and ethers, and more specifically includes carbonate ester compounds, carboxylic ester compounds, and lactone compounds. This is because the dissociability of the electrolyte salt and the mobility of ions are improved.
  • the carbonate ester compounds are cyclic carbonate esters and chain carbonate esters.
  • Specific examples of the cyclic carbonate include ethylene carbonate and propylene carbonate
  • specific examples of the chain carbonate include dimethyl carbonate, diethyl carbonate, and ethylmethyl carbonate.
  • the carboxylic acid ester compound is a chain carboxylic acid ester.
  • chain carboxylic acid esters include ethyl acetate, ethyl propionate, propyl propionate, and ethyl trimethylacetate.
  • Lactone compounds include lactones. Specific examples of lactones include ⁇ -butyrolactone and ⁇ -valerolactone.
  • the ethers may include 1,2-dimethoxyethane, tetrahydrofuran, 1,3-dioxolane, and 1,4-dioxane.
  • the electrolyte salt contains one or more light metal salts such as lithium salts.
  • lithium salts include lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 ), lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), and lithium bis(fluorosulfonyl)imide (LiN).
  • LiN(CF 3 SO 2 ) 2 lithium bis(trifluoromethanesulfonyl)imide
  • LiC(CF 3 SO 2 ) 3 lithium tris(trifluoromethanesulfonyl)methide
  • bis(oxalato)boro include lithium oxide (LiB(C 2 O 4 ) 2 ), lithium monofluorophosphate (Li 2 PFO 3 ), and lithium difluorophosphate (LiPF 2 O 2 ). This is because high battery capacity can be obtained.
  • the content of the electrolyte salt is not particularly limited, but specifically, it is 0.3 mol/kg to 3.0 mol/kg relative to the solvent. This is because high ionic conductivity can be obtained.
  • the electrolytic solution may further contain any one type or two or more types of additives.
  • the types of additives are not particularly limited, but specifically include unsaturated cyclic carbonates, fluorinated cyclic carbonates, sulfonic esters, phosphoric esters, acid anhydrides, nitrile compounds, and isocyanate compounds.
  • unsaturated cyclic carbonate esters include vinylene carbonate, vinylethylene carbonate, and methyleneethylene carbonate.
  • fluorinated cyclic carbonate esters include monofluoroethylene carbonate and difluoroethylene carbonate.
  • sulfonic acid esters include propane sultone and propene sultone.
  • phosphoric acid esters include trimethyl phosphate and triethyl phosphate.
  • acid anhydrides include succinic anhydride, 1,2-ethanedisulfonic anhydride, and 2-sulfobenzoic anhydride.
  • nitrile compounds include succinonitrile.
  • a specific example of the isocyanate compound is hexamethylene diisocyanate.
  • the positive electrode terminal 31 is electrically connected to the positive electrode 21, and more specifically, to the positive electrode current collector 21A.
  • the constituent material of the positive electrode terminal 31 is not particularly limited, but specifically, it is the same as the constituent material of the positive electrode current collector 21A.
  • the positive electrodes 21 and the negative electrodes 22 are alternately stacked with the separator 23 in between, so the battery element 20 includes a plurality of positive electrodes 21.
  • the positive electrode terminal 31 is connected to each of the plurality of positive electrodes 21, so that the secondary battery includes the plurality of positive electrode terminals 31.
  • the plurality of positive electrode terminals 31 are joined to each other, so as shown in FIG. 1, they form one lead-shaped joint portion 31Z.
  • the positive electrode terminal 31 is physically integrated with the positive electrode current collector 21A. This is because the connection resistance between the positive electrode current collector 21A and the positive electrode terminal 31 is reduced, so that the electrical resistance of the entire secondary battery is reduced.
  • the negative electrode terminal 32 is electrically connected to the negative electrode 22, and more specifically, to the negative electrode current collector 22A.
  • This negative electrode terminal 32 is arranged at a position that does not overlap with the positive electrode terminal 31 in a state where the positive electrode 21 and the negative electrode 22 are alternately stacked with the separator 23 in between.
  • the constituent material of the negative electrode terminal 32 is not particularly limited, but specifically, it is the same as the constituent material of the negative electrode current collector 22A.
  • the positive electrodes 21 and the negative electrodes 22 are alternately stacked with the separator 23 in between, so the battery element 20 includes a plurality of negative electrodes 22.
  • the negative electrode terminal 32 is connected to each of the plurality of negative electrodes 22, so that the secondary battery includes the plurality of negative electrode terminals 32.
  • the plurality of negative electrode terminals 32 are joined to each other, so as shown in FIG. 1, they form one lead-shaped joint 32Z.
  • the negative electrode terminal 32 is physically integrated with the negative electrode current collector 22A. This is because the connection resistance between the negative electrode current collector 22A and the negative electrode terminal 32 is reduced, so that the electrical resistance of the entire secondary battery is reduced.
  • the positive electrode lead 41 is connected to a joint portion 31Z, which is a plurality of positive electrode terminals 31 joined to each other, and is led out from the exterior film 10.
  • the constituent material of the positive electrode lead 41 is not particularly limited, but specifically, it is the same as the constituent material of the positive electrode current collector 21A.
  • the shape of the positive electrode lead 41 is not particularly limited, specifically, it is either a thin plate shape or a mesh shape.
  • the negative electrode lead 42 is connected to a joint portion 32Z, which is a plurality of negative electrode terminals 32 joined to each other, and is led out from the exterior film 10.
  • the constituent material of the negative electrode lead 42 is not particularly limited, but specifically, it is the same as the constituent material of the negative electrode current collector 22A. Note that the direction in which the negative electrode lead 42 is led out is the same direction as the direction in which the positive electrode lead 41 is led out. Further, the details regarding the shape of the negative electrode lead 42 are the same as the details regarding the shape of the positive electrode lead 41.
  • Each of the sealing films 51 and 52 is a sealing member that prevents outside air from entering the exterior film 10.
  • the sealing film 51 is inserted between the exterior film 10 and the positive electrode lead 41, and the sealing film 52 is inserted between the exterior film 10 and the negative electrode lead 42.
  • one or both of the sealing films 51 and 52 may be omitted.
  • This sealing film 51 contains a polymer compound such as polyolefin that has adhesiveness to the positive electrode lead 41, and a specific example of the polymer compound is polypropylene.
  • the configuration of the sealing film 52 is similar to that of the sealing film 51 except that it has adhesiveness to the negative electrode lead 42. That is, the sealing film 52 contains a polymer compound such as polyolefin that has adhesiveness to the negative electrode lead 42.
  • FIG. 5 shows a cross-sectional configuration of the battery element 20 after the secondary battery heating test, and corresponds to FIG. 2.
  • the porous layer 23A undergoes thermal contraction in the in-plane direction of the XY plane. More specifically, in a state where the secondary battery is charged under the following charging conditions, after the secondary battery is heated at 130° C. for 60 minutes (heating test), the porous layer 23A is As in, heat shrinks. As a result, a part of the positive electrode side coating layer 23B is peeled off from the porous layer 23A and is in close contact with the positive electrode active material layer 21B. That is, a part of the positive electrode side coating layer 23B is not adjacent to the porous layer 23A and is adjacent to the positive electrode active material layer 21B.
  • a part of the negative electrode side coating layer 23C is peeled off from the negative electrode active material layer 22B due to thermal contraction of the porous layer 23A, so a part of the negative electrode side coating layer 23C is removed from the negative electrode active material layer 22B.
  • a case is shown in which the material layer 22B is not adjacent to the material layer 22B.
  • heating temperature is not limited to 130°C, but may be 130°C ⁇ 2°C.
  • heating time is not limited to 60 minutes, but may be 60 minutes ⁇ 10 minutes.
  • a portion of the positive electrode side coating layer 23B that has peeled off from the porous layer 23A is in close contact with the positive electrode active material layer 21B because the discharge reaction between the positive electrode 21 and the negative electrode 22 is progressing. This is because the short circuit caused by the contact between the positive electrode 21 and the negative electrode 22 is suppressed from occurring while ensuring this.
  • the discharge reaction tends to proceed stably, so the discharge characteristics are improved. In this case, the discharge reaction proceeds stably even if the discharge current increases.
  • the positive electrode side coating layer 23B (separator binder) is thermally fused to the positive electrode active material layer 21B (positive electrode binder). Therefore, the positive electrode side coating layer 23B tightly adheres to the positive electrode active material layer 21B. In this case, as shown in FIG. 5, even if the separator 23 shrinks due to heat generation and heating of the secondary battery, a part of the positive electrode side coating layer 23B does not peel off from the positive electrode active material layer 21B. remains on the surface of the positive electrode active material layer 21B. As a result, the state in which the insulating positive electrode side coating layer 23B is interposed between the positive electrode 21 and the negative electrode 22 is easily maintained without being affected by the thermal contraction of the separator 23, thereby suppressing the occurrence of short circuits. be done.
  • the basis weight is a parameter representing the amount of the positive electrode side coating layer 23B formed, and the basis weight is not particularly limited.
  • the basis weight of the positive electrode side coating layer 23B is preferably 3 g/m 2 to 7 g/m 2 . This is because the amount of the positive electrode side coating layer 23B formed is optimized. Thereby, even if the positive electrode side coating layer 23B is interposed between the positive electrode 21 and the negative electrode 22, the progress of the discharge reaction is less likely to be inhibited.
  • the positive electrode side coating layer 23B is thermally fused to the positive electrode active material layer 21B during heating of the secondary battery, a part of the positive electrode side coating layer 23B tends to remain on the surface of the positive electrode active material layer 21B. Become. Therefore, it becomes easier to ensure the progress of the discharge reaction and to suppress the occurrence of short circuits.
  • the weight (g) of the separator 23 is measured.
  • the porous layer 23A is recovered.
  • the type of solvent is not particularly limited, but specifically, it is an organic solvent such as N-methyl-2-pyrrolidone that can dissolve the separator binder.
  • the weights (g) of the positive electrode side coating layer 23B and the negative electrode side coating layer 23C are calculated.
  • the basis weight (g /cm 2 ). Note that since the area of the positive electrode side coating layer 23B and the area of the negative electrode side coating layer 23C are almost the same, the area used to calculate the basis weight may be the area of the positive electrode side coating layer 23B, or the area of the negative electrode side coating layer 23B. The area of the side covering layer 23C may also be used.
  • This basis weight is calculated based on the calculation formula expressed by the following formula (4). That is, the basis weight is a parameter representing the amount of the positive electrode side coating layer 23B and the negative electrode side coating layer 23C formed per unit area. However, the value of the basis weight shall be the value obtained by rounding off the value to the first decimal place.
  • Area weight sum of the weight of the positive electrode side coating layer 23B and the weight of the negative electrode side coating layer 23C/area of the positive electrode side coating layer 23B or area of the negative electrode side coating layer 23C... (4)
  • a heating test is performed on the secondary battery according to the above-described procedure, and then the battery element 20 is recovered by disassembling the secondary battery after the heating test.
  • the cross section of the battery element 20 is exposed by cutting the battery element 20 using a cutting tool in the direction in which the positive electrodes 21 and the negative electrodes 22 are alternately stacked with the separators 23 in between (Z-axis direction).
  • the cross section cross section along the XZ plane of the battery element 20 using an electron microscope, the observation results (cross-sectional configuration) shown in FIG. 5 are obtained.
  • Cross Section Polisher (registered trademark) manufactured by JEOL Ltd. or the like can be used.
  • the electron microscope it is possible to use one or more types of electron microscopes such as a scanning electron microscope (SEM) and a transmission electron microscope. Note that the observation magnification is not particularly limited, but specifically, it is 20,000 times.
  • the state of the positive electrode side coating layer 23B is confirmed based on an electron micrograph. As a result, if a part of the positive electrode side coating layer 23B is still adjacent to the positive electrode active material layer 21B even though the porous layer 23A has thermally shrunk, the positive electrode side coating layer 23B is Although the entirety of the positive electrode side coating layer 23B was in close contact with the porous layer 23A, after the heating test, it was found that part of the positive electrode side coating layer 23B that had peeled off from the porous layer 23A was in close contact with the positive electrode active material layer 21B. Become.
  • FIG. 6 shows a perspective configuration corresponding to FIG. 1 in order to explain a method for manufacturing a secondary battery.
  • a laminate 20Z used for manufacturing the battery element 20 is shown. Note that details of the laminate 20Z will be described later.
  • the positive electrode 21, the negative electrode 22, and the separator 23 are each manufactured according to the procedure described below, and after preparing the electrolyte, the positive electrode 21, negative electrode 22, and separator 23 are prepared. A secondary battery is assembled using the electrolyte and the secondary battery is stabilized.
  • a paste-like positive electrode mixture slurry is prepared by adding a mixture of a positive electrode active material, a positive electrode binder, and a positive electrode conductive agent (positive electrode mixture) to a solvent.
  • This solvent may be an aqueous solvent or an organic solvent.
  • a positive electrode mixture slurry is applied to both surfaces of the positive electrode current collector 21A (excluding the positive electrode terminal 31) on which the positive electrode terminal 31 is integrated, thereby forming the positive electrode active material layer 21B.
  • the positive electrode active material layer 21B is compression molded using a roll press machine or the like. In this case, the positive electrode active material layer 21B may be heated or compression molding may be repeated multiple times. Thereby, the positive electrode active material layers 21B are formed on both sides of the positive electrode current collector 21A, so that the positive electrode 21 is manufactured.
  • the negative electrode 22 is formed by the same procedure as the positive electrode 21 described above. Specifically, first, a paste-like negative electrode mixture slurry is prepared by adding a mixture (negative electrode mixture) in which a negative electrode active material, a negative electrode binder, and a negative electrode conductive agent are mixed together into a solvent. Subsequently, a negative electrode active material layer 22B is formed by applying a negative electrode mixture slurry to both surfaces (excluding the negative electrode terminal 32) of the negative electrode current collector 22A in which the negative electrode terminal 32 is integrated. Finally, the negative electrode active material layer 22B is compression molded. Thereby, the negative electrode active material layers 22B are formed on both sides of the negative electrode current collector 22A, so that the negative electrode 22 is manufactured.
  • a paste-like negative electrode mixture slurry is prepared by adding a mixture (negative electrode mixture) in which a negative electrode active material, a negative electrode binder, and a negative electrode conductive agent are mixed together into a solvent.
  • a negative electrode active material layer 22B is formed by
  • a paste-like slurry is prepared by adding a mixture of a plurality of insulating particles and a separator binder to a solvent. Details regarding the solvent are as described above. Subsequently, by applying slurry to one surface of the porous layer 23A, a positive electrode side coating layer 23B containing a plurality of insulating particles is formed.
  • a paste-like slurry is prepared by adding a separator binder to a solvent, and then the slurry is applied to one surface of the porous layer 23A on which the positive electrode side coating layer 23B is not formed.
  • a negative electrode side coating layer 23C containing no insulating particles is formed.
  • the positive electrode side coating layer 23B is formed on one side of the porous layer 23A, and the negative electrode side coating layer 23C is formed on the opposite side of the porous layer 23A, so that the separator 23 is produced.
  • the positive electrode 21 and the negative electrode 22 are alternately laminated with the separator 23 in between, thereby producing a laminate 20Z as shown in FIG.
  • This laminate 20Z has the same configuration as the battery element 20, except that the positive electrode 21, the negative electrode 22, and the separator 23 are not impregnated with an electrolytic solution.
  • a joint portion 31Z is formed by joining the plurality of positive electrode terminals 31 to each other using a joining method such as a welding method, and then the positive electrode lead 41 is connected to the joint portion 31Z. Further, after a joint portion 32Z is formed by joining the plurality of negative electrode terminals 32 to each other using a joining method such as a welding method, the negative electrode lead 42 is connected to the joint portion 32Z.
  • the exterior films 10 (fusion layer/metal layer/surface protection layer) are folded to face each other. Subsequently, the outer peripheral edges of two sides of the fusion layers facing each other are adhered to each other using an adhesive method such as a heat fusion method, thereby forming the laminate 20Z inside the bag-shaped exterior film 10. to store. In this case, each of the positive electrode lead 41 and the negative electrode lead 42 is led out from the exterior film 10.
  • a sealing film 51 is inserted between the exterior film 10 and the positive electrode lead 41, and a sealing film 52 is inserted between the exterior film 10 and the negative electrode lead 42.
  • the exterior film 10 containing the laminate 20Z is hot-pressed.
  • the exterior film 10 is heated in the direction in which the positive electrode 21 and the negative electrode 22 are alternately laminated with the separator 23 in between (Z-axis direction), and then the exterior film 10 is moved up and down. Press from As a result, the porous layer 23A is brought into close contact with the positive electrode 21 via the positive electrode side covering layer 23B, and the porous layer 23A is brought into close contact with the negative electrode 22 through the negative electrode side covering layer 23C.
  • the stacked body 20Z is impregnated with the electrolytic solution, so that the battery element 20, which is a stacked electrode body, is manufactured. Therefore, since the battery element 20 is sealed inside the bag-shaped exterior film 10, a secondary battery is assembled.
  • the separator 23 including the porous layer 23A and the positive electrode side coating layer 23B is arranged between the positive electrode 21 and the negative electrode 22.
  • the positive electrode active material layer 21B of the positive electrode 21 contains a positive electrode active material and a positive electrode binder
  • the positive electrode side coating layer 23B disposed between the porous layer 23A and the positive electrode active material layer 21B has a plurality of insulating layers. containing particles and a separator binder.
  • a part of the positive electrode side coating layer 23B is not adjacent to the porous layer 23A and is adjacent to the positive electrode active material layer 21B.
  • the positive electrode side coating layer 23B is thermally fused to the positive electrode active material layer 21B.
  • the separator 23 thermally shrinks during heat generation and heating of the secondary battery, a portion of the positive electrode side coating layer 23B remains on the surface of the positive electrode active material layer 21B. Therefore, the state in which the insulating positive electrode side coating layer 23B is interposed between the positive electrode 21 and the negative electrode 22 is easily maintained, so that the occurrence of short circuits is suppressed.
  • each of the positive electrode binder and the separator binder contains one or both of vinylidene fluoride homopolymer and vinylidene fluoride copolymer, when the secondary battery is heated, Since the positive electrode active material layer 21B (positive electrode binder) and the positive electrode side coating layer 23B (separator binder) are easily thermally fused to each other, higher effects can be obtained.
  • each of the plurality of insulating particles contains one or more types of metal hydroxide, metal oxide, and metal nitride, sufficient heat dissipation properties can be achieved in the positive electrode side coating layer 23B. Therefore, higher effects can be obtained.
  • the positive electrodes 21 and negative electrodes 22 are alternately stacked with the separator 23 in between, the occurrence of short circuits can be effectively suppressed even if the positive electrodes 21 are stacked with the separator 23 in between, resulting in a higher effect. can be obtained.
  • a positive electrode terminal 31 is connected to each of the plurality of positive electrodes 21
  • a negative electrode terminal 32 is connected to each of the plurality of negative electrodes 22
  • a plurality of positive electrode terminals 31 are joined to each other, and a plurality of positive electrode terminals 31 are connected to each of the plurality of negative electrodes 22. If the negative electrode terminals 32 of the two are connected to each other, the battery capacity is guaranteed and the occurrence of short circuits is effectively suppressed, so that even higher effects can be obtained.
  • the battery element 20 is housed inside the exterior film 10, the positive electrode lead 41 joined to the joint 31Z is led out from the exterior film 10, and the negative electrode lead 42 joined to the joint 32Z is connected to the exterior film. 10, even if a plurality of positive electrode terminals 31 and a plurality of negative electrode terminals 32 are used, the sealing performance of the exterior film 10 is improved, and a significantly high effect can be obtained.
  • the thickness of the joint portion 31Z which is a joined body of a plurality of positive electrode terminals 31, increases. gaps are likely to occur. This makes it difficult to seal the exterior film 10 using the sealing film 51, and thus the sealability of the exterior film 10 is reduced.
  • the thickness of the positive electrode lead 41 becomes smaller compared to the thickness of the joint part 31Z, which is a joined body of the plurality of positive electrode terminals 31. , a gap is less likely to occur between the exterior film 10 and the positive electrode lead 41. This makes it easier to seal the exterior film 10 using the sealing film 51, so that the sealability of the exterior film 10 is improved.
  • the secondary battery is a lithium ion secondary battery, a sufficient battery capacity can be stably obtained by utilizing intercalation and desorption of lithium, so higher effects can be obtained.
  • the separator 23 includes both a positive electrode side coating layer 23B and a negative electrode side coating layer 23C.
  • the separator 23 may include only the positive electrode side coating layer 23B without including the negative electrode side coating layer 23C. Also in this case, the adhesion of the separator 23 to the positive electrode 21 is increased using the positive electrode side coating layer 23B, so that the same effect can be obtained.
  • the positive electrode terminal 31 is physically integrated with the positive electrode current collector 21A. However, since the positive electrode terminal 31 is physically separated from the positive electrode current collector 21A, it may be separate from the positive electrode current collector 21A. In this case, the positive electrode terminal 31 may be connected to the positive electrode current collector 21A using a joining method such as a welding method.
  • the positive electrode terminal 31 is electrically connected to the positive electrode 21, the same effect can be obtained.
  • the positive electrode terminal 31 is physically integrated with the positive electrode current collector 21A.
  • the protrusion of the negative electrode current collector 22A also serves as the negative electrode terminal 32, so the negative electrode terminal 32 is physically integrated with the negative electrode current collector 22A.
  • the negative electrode terminal 32 since the negative electrode terminal 32 is physically separated from the negative electrode current collector 22A, it may be separate from the negative electrode current collector 22A. In this case, the negative electrode terminal 32 may be connected to the negative electrode current collector 22A using a joining method such as a welding method.
  • the negative electrode terminal 32 is electrically connected to the negative electrode 22, the same effect can be obtained.
  • the negative electrode terminal 32 is physically integrated with the negative electrode current collector 22A.
  • a battery element 20 which is a laminated electrode body is used.
  • the battery element 20 which is a wound electrode body may also be used.
  • the positive electrode 21 has a band-like structure
  • the positive electrode lead 41 is connected to the positive electrode current collector 21A
  • the negative electrode 22 has a band-like structure
  • the negative electrode current collector 22A A negative electrode lead 42 is connected to.
  • the number of positive electrode leads 41 may be one or two or more
  • the number of negative electrode leads 42 may be one or two or more.
  • the secondary battery can be charged and discharged using the battery element 20, so similar effects can be obtained.
  • a secondary battery used as a power source may be a main power source or an auxiliary power source in applications such as electronic equipment and electric vehicles.
  • the main power source is a power source that is used preferentially, regardless of the presence or absence of other power sources.
  • the auxiliary power source may be a power source used in place of the main power source, or may be a power source that can be switched from the main power source.
  • the secondary battery uses of the secondary battery.
  • Electronic devices such as video cameras, digital still cameras, mobile phones, notebook computers, headphone stereos, portable radios, and portable information terminals.
  • Backup power supplies and storage devices such as memory cards.
  • Power tools such as power drills and power saws. This is a battery pack installed in electronic devices.
  • Medical electronic devices such as pacemakers and hearing aids.
  • Electric vehicles such as electric vehicles (including hybrid vehicles).
  • a power storage system such as a household or industrial battery system that stores power in case of an emergency. In these applications, one secondary battery or a plurality of secondary batteries may be used.
  • the battery pack may use single cells or assembled batteries.
  • An electric vehicle is a vehicle that runs using a secondary battery as a driving power source, and may be a hybrid vehicle that also includes a driving source other than the secondary battery.
  • household electrical appliances and the like can be used by using the electric power stored in a secondary battery, which is a power storage source.
  • FIG. 7 shows the block configuration of the battery pack.
  • the battery pack described here is a battery pack (so-called soft pack) using one secondary battery, and is installed in electronic devices such as smartphones.
  • this battery pack includes a power source 71 and a circuit board 72.
  • This circuit board 72 is connected to a power source 71 and includes a positive terminal 73, a negative terminal 74, and a temperature detection terminal 75.
  • the power source 71 includes one secondary battery.
  • the positive electrode lead is connected to the positive electrode terminal 73
  • the negative electrode lead is connected to the negative electrode terminal 74.
  • This power source 71 can be connected to an external power source via the positive terminal 73 and the negative terminal 74, and therefore can be charged and discharged using the external power source.
  • the circuit board 72 includes a control section 76 , a switch 77 , a PTC element 78 , and a temperature detection section 79 .
  • the PTC element 78 may be omitted.
  • the control unit 76 includes a central processing unit (CPU), memory, etc., and controls the operation of the entire battery pack. This control unit 76 detects and controls the usage status of the power source 71 as necessary.
  • CPU central processing unit
  • memory etc.
  • the control unit 76 prevents the charging current from flowing in the current path of the power source 71 by cutting off the switch 77. Make it.
  • the overcharge detection voltage is not particularly limited, specifically, it is 4.20V ⁇ 0.05V
  • the overdischarge detection voltage is not particularly limited, but specifically, it is 2.40V ⁇ 0.1V. It is.
  • the switch 77 includes a charging control switch, a discharging control switch, a charging diode, a discharging diode, and the like, and switches whether or not the power supply 71 is connected to an external device according to an instruction from the control unit 76.
  • This switch 77 includes a field effect transistor (MOSFET) using a metal oxide semiconductor, and the charging/discharging current is detected based on the ON resistance of the switch 77.
  • MOSFET field effect transistor
  • the temperature detection section 79 includes a temperature detection element such as a thermistor.
  • the temperature detection section 79 measures the temperature of the power supply 71 using the temperature detection terminal 75 and outputs the temperature measurement result to the control section 76 .
  • the measurement result of the temperature measured by the temperature detection unit 79 is used when the control unit 76 performs charge/discharge control during abnormal heat generation and when the control unit 76 performs correction processing when calculating the remaining capacity.
  • the element structure of the battery element is a stacked type.
  • the element structure of the battery element is not particularly limited, other element structures such as a ninety-nine fold type may be used.
  • a ninety-nine fold type a positive electrode and a negative electrode are folded in a zigzag pattern while facing each other with a separator in between.
  • the electrode reactant is not particularly limited.
  • the electrode reactants may be other alkali metals, such as sodium and potassium, or alkaline earth metals, such as beryllium, magnesium, and calcium, as described above.
  • the electrode reactant may be other light metals such as aluminum.

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Abstract

L'invention concerne une batterie secondaire comprenant : une électrode positive qui comprend une couche de matériau actif d'électrode positive ; une électrode négative ; un séparateur qui est ménagé entre l'électrode positive et l'électrode négative ; et une solution électrolytique. La couche de matériau actif d'électrode positive comprend un matériau actif d'électrode positive et un premier liant. Le séparateur comprend une couche poreuse et une couche de revêtement ménagée entre cette couche poreuse et la couche de matériau actif d'électrode positive et cette couche de revêtement comprend une pluralité de particules isolantes et un second liant. Une partie de la couche de revêtement n'est pas adjacente à la couche poreuse et est adjacente à la couche de matériau actif d'électrode positive.
PCT/JP2023/010712 2022-03-30 2023-03-17 Batterie secondaire WO2023189762A1 (fr)

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JP2022-056759 2022-03-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005235508A (ja) * 2004-02-18 2005-09-02 Matsushita Electric Ind Co Ltd リチウムイオン二次電池およびその製造方法
JP2006351386A (ja) * 2005-06-16 2006-12-28 Mitsubishi Electric Corp 電池及びその製造方法
JP2013163806A (ja) * 2012-01-11 2013-08-22 Toray Ind Inc 多孔質フィルムおよび蓄電デバイス用セパレータ
JP2013218925A (ja) * 2012-04-10 2013-10-24 Tdk Corp セパレータ、及びそれを用いた非水系二次電池

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005235508A (ja) * 2004-02-18 2005-09-02 Matsushita Electric Ind Co Ltd リチウムイオン二次電池およびその製造方法
JP2006351386A (ja) * 2005-06-16 2006-12-28 Mitsubishi Electric Corp 電池及びその製造方法
JP2013163806A (ja) * 2012-01-11 2013-08-22 Toray Ind Inc 多孔質フィルムおよび蓄電デバイス用セパレータ
JP2013218925A (ja) * 2012-04-10 2013-10-24 Tdk Corp セパレータ、及びそれを用いた非水系二次電池

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