WO2016194747A1 - エネルギー貯蔵デバイス電極用アンダーコート箔 - Google Patents
エネルギー貯蔵デバイス電極用アンダーコート箔 Download PDFInfo
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- WO2016194747A1 WO2016194747A1 PCT/JP2016/065529 JP2016065529W WO2016194747A1 WO 2016194747 A1 WO2016194747 A1 WO 2016194747A1 JP 2016065529 W JP2016065529 W JP 2016065529W WO 2016194747 A1 WO2016194747 A1 WO 2016194747A1
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- Prior art keywords
- undercoat
- energy storage
- storage device
- foil
- group
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- 125000005920 sec-butoxy group Chemical group 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- MNCGMVDMOKPCSQ-UHFFFAOYSA-M sodium;2-phenylethenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C=CC1=CC=CC=C1 MNCGMVDMOKPCSQ-UHFFFAOYSA-M 0.000 description 1
- 238000000527 sonication Methods 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000005415 substituted alkoxy group Chemical group 0.000 description 1
- 125000000446 sulfanediyl group Chemical group *S* 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 125000000626 sulfinic acid group Chemical group 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 description 1
- 229920006027 ternary co-polymer Polymers 0.000 description 1
- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- WGHUNMFFLAMBJD-UHFFFAOYSA-M tetraethylazanium;perchlorate Chemical compound [O-]Cl(=O)(=O)=O.CC[N+](CC)(CC)CC WGHUNMFFLAMBJD-UHFFFAOYSA-M 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- OSBSFAARYOCBHB-UHFFFAOYSA-N tetrapropylammonium Chemical compound CCC[N+](CCC)(CCC)CCC OSBSFAARYOCBHB-UHFFFAOYSA-N 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 125000005023 xylyl group Chemical group 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
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- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/665—Composites
- H01M4/667—Composites in the form of layers, e.g. coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/36—Nanostructures, e.g. nanofibres, nanotubes or fullerenes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/48—Conductive polymers
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- H—ELECTRICITY
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
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- H01G11/68—Current collectors characterised by their material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
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- H—ELECTRICITY
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- 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
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- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
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- 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
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- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
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- H—ELECTRICITY
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- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
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- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/50—Electrodes characterised by their material specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
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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
- 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
- Y02E60/13—Energy storage using capacitors
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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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/70—Nanostructure
- Y10S977/734—Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc.
- Y10S977/742—Carbon nanotubes, CNTs
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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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S977/00—Nanotechnology
- Y10S977/70—Nanostructure
- Y10S977/734—Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc.
- Y10S977/753—Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc. with polymeric or organic binder
-
- 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
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- Y10S977/00—Nanotechnology
- Y10S977/902—Specified use of nanostructure
- Y10S977/932—Specified use of nanostructure for electronic or optoelectronic application
- Y10S977/948—Energy storage/generating using nanostructure, e.g. fuel cell, battery
Definitions
- the present invention relates to an undercoat foil for energy storage device electrodes.
- metal tabs are welded to the positive electrode and the negative electrode, respectively, as terminals for taking out current from the positive electrode and the negative electrode.
- the metal tab is usually welded to the current collector substrate, and even with the electrode having the undercoat layer formed, the metal tab is welded at the site where the undercoat layer and the active material layer are not formed on the current collector substrate. (For example, refer to Patent Document 1).
- the present invention has been made in view of the above circumstances, and undercoating foil for an energy storage device electrode capable of ultrasonic welding and providing a low-resistance energy storage device, and an energy storage device electrode including the same And an energy storage device.
- the present inventors have found that carbon contained in the undercoat layer formed on at least one surface of the current collector substrate.
- the material is carbon nanotube (hereinafter sometimes abbreviated as CNT), and the basis weight of the CNT-containing undercoat layer is within a predetermined range, whereby the CNT-containing undercoat layer is formed on the current collecting substrate. It has been found that ultrasonic welding can be efficiently carried out at a part, and it has been found that a low-resistance energy storage device can be obtained even when an electrode having this low basis weight undercoat foil is used. Was completed.
- a current collecting substrate and an undercoat layer formed on at least one surface of the current collecting substrate, the undercoat layer containing carbon nanotubes, and a basis weight per surface of the current collecting substrate Is an undercoat foil for an energy storage device electrode, wherein the undercoat foil is 0.1 g / m 2 or less, 2.
- An energy storage device electrode having an undercoat foil for an energy storage device electrode according to any one of 1 to 8 and an active material layer formed on a part or all of the surface of the undercoat layer; 10. 9 energy storage device electrodes, wherein the active material layer is formed on a part of the surface of the undercoat layer; 11. 10 energy storage device electrodes formed such that the active material layer leaves the periphery of the undercoat layer and covers all other portions; 12 An energy storage device comprising the energy storage device electrode of any of 9-11, 13 It has at least one electrode structure comprising one or a plurality of electrodes according to claim 10 or 11 and a metal tab, and at least one of the electrodes has the undercoat layer formed thereon.
- an energy storage device ultrasonically welded to the metal tab at a portion where the active material layer is not formed 14 10 energy storage devices, wherein the metal tab comprises at least one metal selected from aluminum, copper and nickel; 15.
- the undercoat foil for energy storage device electrodes which have a CNT layer which can be ultrasonically welded efficiently can be provided.
- an electrode having this undercoat foil By using an electrode having this undercoat foil, a low-resistance energy storage device and a simple and efficient manufacturing method thereof can be provided.
- An undercoat foil for an energy storage device electrode according to the present invention (hereinafter referred to as an undercoat foil) has a current collecting substrate and an undercoat layer formed on at least one surface of the current collecting substrate.
- the layer contains carbon nanotubes, and the weight per one surface of the current collecting substrate is 0.1 g / m 2 or less.
- Examples of the energy storage device in the present invention include various energy storage devices such as an electric double layer capacitor, a lithium secondary battery, a lithium ion secondary battery, a proton polymer battery, a nickel hydrogen battery, an aluminum solid capacitor, an electrolytic capacitor, and a lead storage battery.
- the undercoat foil of the present invention can be suitably used for electric double layer capacitors and lithium ion secondary batteries.
- CNT is used as the carbon material constituting the undercoat layer.
- CNTs are generally produced by arc discharge, chemical vapor deposition (CVD), laser ablation, etc., but the CNTs used in the present invention may be obtained by any method.
- a single-layer CNT hereinafter also abbreviated as SWCNT
- SWCNT single-layer CNT
- DWCNT single carbon film
- MWCNT multi-layer CNT
- SWCNT, DWCNT, and MWCNT are respectively Can be used alone or in combination.
- catalyst metals such as nickel, iron, cobalt, yttrium may remain, and purification for removing these impurities is required.
- ultrasonic treatment is effective together with acid treatment with nitric acid, sulfuric acid and the like.
- acid treatment with nitric acid, sulfuric acid or the like destroys the ⁇ -conjugated system constituting CNT and may impair the original characteristics of CNT. Therefore, it is desirable to purify and use under appropriate conditions.
- the undercoat layer of the present invention is preferably prepared using a CNT-containing composition (dispersion) containing CNT, a solvent, and, if necessary, a matrix polymer and / or a CNT dispersant.
- the solvent is not particularly limited as long as it is conventionally used for the preparation of a CNT-containing composition.
- a CNT-containing composition For example, water; tetrahydrofuran (THF), diethyl ether, 1,2-dimethoxyethane (DME), etc.
- Ethers halogenated hydrocarbons such as methylene chloride, chloroform, 1,2-dichloroethane; N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone ( Amides such as NMP); ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; alcohols such as methanol, ethanol, isopropanol, and n-propanol; aliphatic hydrocarbons such as n-heptane, n-hexane, and cyclohexane Class: Benzene, Torue Aromatic solvents such as xylene and ethylbenzene; glycol ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and propylene glycol monomethyl ether; and organic solvents such as glyco
- water, NMP, DMF, THF, methanol, and isopropanol are preferable from the viewpoint that the ratio of isolated dispersion of CNT can be improved, and these solvents can be used alone or in combination of two or more. .
- the matrix polymer examples include polyvinylidene fluoride (PVdF), polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer [P (VDF-HFP)], Fluorine resin such as vinylidene fluoride-trichloroethylene copolymer [P (VDF-CTFE)], polyvinyl pyrrolidone, ethylene-propylene-diene terpolymer, PE (polyethylene), PP (polypropylene), Polyolefin resins such as EVA (ethylene-vinyl acetate copolymer), EEA (ethylene-ethyl acrylate copolymer); PS (polystyrene), HIPS (high impact polystyrene), AS (acrylonitrile-styrene copolymer), ABS Rononitrile-butadiene-sty
- the matrix polymer can also be obtained as a commercial product.
- a commercial product examples include sodium polyacrylate (manufactured by Wako Pure Chemical Industries, Ltd., degree of polymerization 2,700 to 7,500), carboxy Sodium methylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.), sodium alginate (manufactured by Kanto Chemical Co., Ltd., deer grade 1), Metrol's SH series (hydroxypropylmethylcellulose, Shin-Etsu Chemical Co., Ltd.), Metrolose SE series (hydroxyl) Ethyl methyl cellulose, manufactured by Shin-Etsu Chemical Co., Ltd.), JC-25 (completely saponified polyvinyl alcohol, manufactured by Nippon Vineyard Poval Co., Ltd.), JM-17 (intermediate saponified polyvinyl alcohol, Nippon Vinegared / Poval) Manufactured by Co., Ltd.), JP-03 (partially saponified polyvinyl alcohol, Nippon Vinegar Po
- the CNT dispersant is not particularly limited, and can be appropriately selected from those conventionally used as CNT dispersants.
- CMC carboxymethyl cellulose
- PVP polyvinyl pyrrolidone
- acrylic resin emulsion Water-soluble acrylic polymer, styrene emulsion, silicone emulsion, acrylic silicone emulsion, fluororesin emulsion, EVA emulsion, vinyl acetate emulsion, vinyl chloride emulsion, urethane resin emulsion, triarylamine-based polymer described in International Publication No. 2014/04280
- Examples of the branched polymer include vinyl polymers having an oxazoline group in the side chain described in WO2015 / 029949. In the present invention, WO2014 / 0428 is used. Vinyl polymers having No. triarylamine hyperbranched polymer according, an oxazoline group in a side chain of WO 2015/029949 Patent describes are suitable.
- a highly branched polymer obtained by condensation polymerization of triarylamines and aldehydes and / or ketones represented by the following formulas (1) and (2) under acidic conditions is preferably used. It is done.
- Ar 1 to Ar 3 each independently represent any divalent organic group represented by the formulas (3) to (7).
- the substituted or unsubstituted phenylene group represented by (3) is preferred.
- R 5 to R 38 each independently represents a hydrogen atom, a halogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or a branched structure having 1 to 5 carbon atoms).
- Z 1 and Z 2 are each independently a hydrogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or the formula (8) Represents any monovalent organic group represented by (11) above (provided that Z 1 and Z 2 do not simultaneously become the above alkyl group), but Z 1 and Z 2 are each independently A hydrogen atom, a 2- or 3-thienyl group, or a group represented by the formula (8) is preferable, and in particular, one of Z 1 and Z 2 is a hydrogen atom, and the other is a hydrogen atom, 2- or More preferred is a 3-thienyl group, a group represented by the formula (8), particularly one in which R 41 is a phenyl group, or R 41 is a methoxy group.
- R 41 is a phenyl group
- an acidic group may be introduced onto the phenyl group when a method for introducing an acidic group after polymer production is used in the acidic group introduction method described later.
- alkyl group which may have a branched structure having 1 to 5 carbon atoms include those similar to those exemplified above.
- R 39 to R 62 each independently represent a hydrogen atom, a halogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or a branched structure having 1 to 5 carbon atoms.
- R 63 and R 64 each independently represents a hydrogen atom, 1 to 5 carbon atoms
- R 1 to R 38 are each independently a hydrogen atom, a halogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or a carbon number It represents an alkoxy group, a carboxyl group, a sulfo group, a phosphoric acid group, a phosphonic acid group, or a salt thereof, which may have 1 to 5 branched structures.
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- examples of the alkyl group which may have a branched structure having 1 to 5 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group, tert-butyl group, n -Pentyl group and the like.
- alkoxy group which may have a branched structure having 1 to 5 carbon atoms include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group, tert-butoxy group, Examples thereof include an n-pentoxy group.
- Salts of carboxyl group, sulfo group, phosphoric acid group and phosphonic acid group include alkali metal salts such as sodium and potassium; group 2 metal salts such as magnesium and calcium; ammonium salts; propylamine, dimethylamine, triethylamine, ethylenediamine, etc. Aliphatic amine salts; alicyclic amine salts such as imidazoline, piperazine and morpholine; aromatic amine salts such as aniline and diphenylamine; pyridinium salts and the like.
- R 39 to R 62 are each independently a hydrogen atom, a halogen atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, or a carbon number of 1 Haloalkyl group, phenyl group, OR 63 , COR 63 , NR 63 R 64 , COOR 65 , which may have a branched structure of ⁇ 5 (in these formulas, R 63 and R 64 are each independently hydrogen Represents an atom, an alkyl group which may have a branched structure having 1 to 5 carbon atoms, a haloalkyl group which may have a branched structure having 1 to 5 carbon atoms, or a phenyl group, and R 65 represents the number of carbon atoms Represents an alkyl group which may have a branched structure of 1 to 5, a haloalkyl group which may have a branched structure of 1 to 5 carbon atoms,
- the haloalkyl group which may have a branched structure having 1 to 5 carbon atoms includes difluoromethyl group, trifluoromethyl group, bromodifluoromethyl group, 2-chloroethyl group, 2-bromoethyl group, 1,1 -Difluoroethyl group, 2,2,2-trifluoroethyl group, 1,1,2,2-tetrafluoroethyl group, 2-chloro-1,1,2-trifluoroethyl group, pentafluoroethyl group, 3 -Bromopropyl group, 2,2,3,3-tetrafluoropropyl group, 1,1,2,3,3,3-hexafluoropropyl group, 1,1,1,3,3,3-hexafluoropropane Examples include -2-yl group, 3-bromo-2-methylpropyl group, 4-bromobutyl group, perfluoropentyl group and the like. Examples of the halogen
- the hyperbranched polymer has a carboxyl group in at least one aromatic ring of the repeating unit represented by the formula (1) or (2), Those having at least one acidic group selected from a sulfo group, a phosphoric acid group, a phosphonic acid group, and salts thereof are preferable, and those having a sulfo group or a salt thereof are more preferable.
- aldehyde compound used for the production of the hyperbranched polymer examples include formaldehyde, paraformaldehyde, acetaldehyde, propylaldehyde, butyraldehyde, isobutyraldehyde, valeraldehyde, capronaldehyde, 2-methylbutyraldehyde, hexylaldehyde, undecylaldehyde, 7 -Saturated aliphatic aldehydes such as methoxy-3,7-dimethyloctylaldehyde, cyclohexanecarboxaldehyde, 3-methyl-2-butyraldehyde, glyoxal, malonaldehyde, succinaldehyde, glutaraldehyde, adipine aldehyde; acrolein, methacrolein Unsaturated aldehydes such as: furfural, pyridine aldehy
- Examples of the ketone compound used in the production of the hyperbranched polymer include alkyl aryl ketones and diaryl ketones, such as acetophenone, propiophenone, diphenyl ketone, phenyl naphthyl ketone, dinaphthyl ketone, phenyl tolyl ketone, and ditolyl ketone. Etc.
- the average molecular weight of the hyperbranched polymer is not particularly limited, but the weight average molecular weight is preferably 1,000 to 2,000,000, and more preferably 2,000 to 1,000,000.
- the weight average molecular weight in this invention is a measured value (polystyrene conversion) by gel permeation chromatography.
- Specific examples of the hyperbranched polymer include, but are not limited to, those represented by the following formula.
- an oxazoline monomer having a polymerizable carbon-carbon double bond-containing group at the 2-position as shown in formula (13) is a radical.
- a polymer obtained by polymerization and having a repeating unit bonded to the polymer main chain or a spacer group at the 2-position of the oxazoline ring is preferred.
- X represents a polymerizable carbon-carbon double bond-containing group
- R 100 to R 103 may each independently have a hydrogen atom, a halogen atom, or a branched structure having 1 to 5 carbon atoms.
- An alkyl group, an aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms is represented.
- the polymerizable carbon-carbon double bond-containing group of the oxazoline monomer is not particularly limited as long as it contains a polymerizable carbon-carbon double bond, but a chain containing a polymerizable carbon-carbon double bond.
- a hydrocarbon group having 2 to 8 carbon atoms such as vinyl group, allyl group and isopropenyl group is preferable.
- the halogen atom and the alkyl group which may have a branched structure having 1 to 5 carbon atoms include the same ones as described above.
- Specific examples of the aryl group having 6 to 20 carbon atoms include phenyl group, xylyl group, tolyl group, biphenyl group, naphthyl group and the like.
- Specific examples of the aralkyl group having 7 to 20 carbon atoms include benzyl group, phenylethyl group, phenylcyclohexyl group and the like.
- oxazoline monomer having a polymerizable carbon-carbon double bond-containing group at the 2-position represented by the formula (13) include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-4-ethyl-2-oxazoline, 2-vinyl-4-propyl-2-oxazoline, 2-vinyl-4-butyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2- Vinyl-5-ethyl-2-oxazoline, 2-vinyl-5-propyl-2-oxazoline, 2-vinyl-5-butyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-isopropenyl-4- Methyl-2-oxazoline, 2-isopropenyl-4-ethyl-2-oxazoline, 2-isopropenyl-4-propyl-2-oxazoline, 2 Isopropenyl-4-
- the oxazoline polymer is preferably water-soluble.
- a water-soluble oxazoline polymer may be a homopolymer of the oxazoline monomer represented by the above formula (13).
- the oxazoline polymer has a hydrophilic functional group (meta) ) It is preferable to be obtained by radical polymerization of at least two monomers with an acrylate monomer.
- (meth) acrylic monomer having a hydrophilic functional group examples include (meth) acrylic acid, 2-hydroxyethyl acrylate, methoxypolyethylene glycol acrylate, monoesterified product of acrylic acid and polyethylene glycol, acrylic acid 2-aminoethyl and its salt, 2-hydroxyethyl methacrylate, methoxypolyethylene glycol methacrylate, monoesterified product of methacrylic acid and polyethylene glycol, 2-aminoethyl methacrylate and its salt, sodium (meth) acrylate, ( Ammonium methacrylate, (meth) acrylonitrile, (meth) acrylamide, N-methylol (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, sodium styrenesulfonate, etc. The like, which may be used singly or may be used in combination of two or more. Among these, (meth) acrylic acid methoxypolyethylene glycol and mono
- (Meth) acrylic acid ester monomers such as perfluoroethyl acid and phenyl (meth) acrylate; ⁇ -olefin monomers such as ethylene, propylene, butene and pentene; haloolefins such as vinyl chloride, vinylidene chloride and vinyl fluoride Monomers: Styrene monomers such as styrene and ⁇ -methyl styrene; Vinyl ester monomers such as vinyl acetate and vinyl propionate; Vinyl ether monomers such as methyl vinyl ether and ethyl vinyl ether, and the like. But two or more A combination of the above may also be used.
- the content of the oxazoline monomer is preferably 10% by mass or more, more preferably 20% by mass or more from the viewpoint of further improving the CNT dispersibility of the obtained oxazoline polymer. 30% by mass or more is even more preferable.
- the upper limit of the content rate of the oxazoline monomer in a monomer component is 100 mass%, and the homopolymer of an oxazoline monomer is obtained in this case.
- the content of the (meth) acrylic monomer having a hydrophilic functional group in the monomer component is preferably 10% by mass or more, more preferably 20% by mass or more from the viewpoint of further increasing the water solubility of the obtained oxazoline polymer. 30% by mass or more is even more preferable.
- the content of other monomers in the monomer component is a range that does not affect the CNT dispersibility of the obtained oxazoline polymer, and since it varies depending on the type, it cannot be determined unconditionally. What is necessary is just to set suitably in the range of 5-95 mass%, Preferably it is 10-90 mass%.
- the average molecular weight of the oxazoline polymer is not particularly limited, but the weight average molecular weight is preferably 1,000 to 2,000,000, and more preferably 2,000 to 1,000,000.
- the oxazoline polymer that can be used in the present invention can be synthesized by a conventional radical polymerization of the above-mentioned monomers, but can also be obtained as a commercial product, and as such a commercial product, for example, Epocross WS-300 (Manufactured by Nippon Shokubai Co., Ltd., solid content concentration 10% by mass, aqueous solution), Epocross WS-700 (manufactured by Nippon Shokubai Co., Ltd., solid content concentration 25% by mass, aqueous solution), Epocross WS-500 (Nippon Catalyst Co., Ltd.
- the mixing ratio of CNT and dispersant can be about 1,000: 1 to 1: 100 by mass ratio.
- the concentration of the dispersant in the composition is not particularly limited as long as it is a concentration capable of dispersing CNTs in a solvent, but is preferably about 0.001 to 30% by mass in the composition, More preferably, it is about 0.002 to 20% by mass.
- the concentration of CNT in the composition varies in the amount of the target undercoat layer and the required mechanical, electrical, and thermal characteristics, and at least a part of the CNT is present.
- an undercoat layer can be produced with a basis weight specified in the present invention, it is preferably about 0.0001 to 30% by mass in the composition, preferably 0.001 to 20% by mass More preferably, it is more preferably about 0.001 to 10% by mass.
- the CNT-containing composition used in the present invention may contain a crosslinking agent that causes a crosslinking reaction with the dispersant to be used or a crosslinking agent that self-crosslinks. These crosslinking agents are preferably dissolved in the solvent used.
- the crosslinking agent for the triarylamine-based hyperbranched polymer include melamine-based, substituted urea-based, or their polymer-based crosslinking agents. These crosslinking agents may be used alone or in combination of two or more. Can be used.
- the cross-linking agent has at least two cross-linking substituents, such as CYMEL (registered trademark), methoxymethylated glycoluril, butoxymethylated glycoluril, methylolated glycoluril, methoxymethylated melamine, butoxymethyl.
- Melamine methylolated melamine, methoxymethylated benzoguanamine, butoxymethylated benzoguanamine, methylolated benzoguanamine, methoxymethylated urea, butoxymethylated urea, methylolated urea, methoxymethylated thiourea, methoxymethylated thiourea, methylolated thio
- Examples include compounds such as urea, and condensates of these compounds.
- the crosslinking agent for the oxazoline polymer is particularly limited as long as it is a compound having two or more functional groups having reactivity with an oxazoline group such as a carboxyl group, a hydroxyl group, a thiol group, an amino group, a sulfinic acid group, and an epoxy group. Although not intended, compounds having two or more carboxyl groups are preferred.
- a compound having a functional group that causes a crosslinking reaction by heating during thin film formation or in the presence of an acid catalyst, such as a sodium salt, potassium salt, lithium salt, or ammonium salt of a carboxylic acid is also crosslinked. It can be used as an agent.
- Specific examples of compounds that undergo a crosslinking reaction with an oxazoline group include metal salts of synthetic polymers such as polyacrylic acid and copolymers thereof and natural polymers such as carboxymethylcellulose and alginic acid that exhibit crosslinking reactivity in the presence of an acid catalyst.
- ammonium salts of the above synthetic polymers and natural polymers that exhibit crosslinking reactivity by heating, especially sodium polyacrylate that exhibits crosslinking reactivity in the presence of an acid catalyst or under heating conditions Preference is given to lithium polyacrylate, ammonium polyacrylate, sodium carboxymethylcellulose, lithium carboxymethylcellulose, carboxymethylcellulose ammonium and the like.
- Such a compound that causes a crosslinking reaction with an oxazoline group can also be obtained as a commercial product.
- a commercial product examples include sodium polyacrylate (manufactured by Wako Pure Chemical Industries, Ltd., degree of polymerization of 2, 700-7,500), sodium carboxymethylcellulose (manufactured by Wako Pure Chemical Industries, Ltd.), sodium alginate (manufactured by Kanto Chemical Co., Ltd., deer grade 1), Aron A-30 (ammonium polyacrylate, Toagosei Co., Ltd.) ), Solid concentration 32% by mass, aqueous solution), DN-800H (carboxymethylcellulose ammonium, manufactured by Daicel Finechem Co., Ltd.), ammonium alginate (produced by Kimika Co., Ltd.), and the like.
- crosslinking agent examples include, for example, an aldehyde group, an epoxy group, a vinyl group, an isocyanate group, an alkoxy group, a carboxyl group, an aldehyde group, an amino group, an isocyanate group, an epoxy group, and an amino group.
- crosslinkable functional groups that react with each other in the same molecule, such as isocyanate groups and aldehyde groups, hydroxyl groups that react with the same crosslinkable functional groups (dehydration condensation), mercapto groups (disulfide bonds), Examples thereof include compounds having an ester group (Claisen condensation), a silanol group (dehydration condensation), a vinyl group, an acrylic group, and the like.
- Specific examples of the crosslinking agent that self-crosslinks include polyfunctional acrylate, tetraalkoxysilane, a monomer having a blocked isocyanate group, a hydroxyl group, a carboxylic acid, and an amino group that exhibit crosslinking reactivity in the presence of an acid catalyst.
- the block copolymer of the monomer which has is mentioned.
- Such a self-crosslinking crosslinking agent can also be obtained as a commercial product.
- a commercial product examples include A-9300 (ethoxylated isocyanuric acid triacrylate, Shin-Nakamura Chemical ( ), A-GLY-9E (Ethoxylatedinglycerine triacrylate (EO9 mol), Shin-Nakamura Chemical Co., Ltd.), A-TMMT (pentaerythritol tetraacrylate, Shin-Nakamura Chemical Co., Ltd.), tetraalkoxysilane In the case of tetramethoxysilane (manufactured by Tokyo Chemical Industry Co., Ltd.), tetraethoxysilane (manufactured by Toyoko Chemical Co., Ltd.), and polymers having a blocked isocyanate group, Elastron series E-37, H-3, H38, BAP, NEW BAP-15, C-52, F-2 9, W-11P, MF-9, MF-25K (D
- the amount of these crosslinking agents to be added varies depending on the solvent used, the substrate used, the required viscosity, the required film shape, etc., but is 0.001 to 80% by mass, preferably 0.8%, based on the dispersant. The amount is from 01 to 50% by mass, more preferably from 0.05 to 40% by mass.
- These cross-linking agents may cause a cross-linking reaction by self-condensation, but they cause a cross-linking reaction with the dispersant. If a cross-linkable substituent is present in the dispersant, the cross-linking reaction is caused by those cross-linkable substituents. Promoted.
- a catalyst for accelerating the crosslinking reaction p-toluenesulfonic acid, trifluoromethanesulfonic acid, pyridinium p-toluenesulfonic acid, salicylic acid, sulfosalicylic acid, citric acid, benzoic acid, hydroxybenzoic acid, naphthalenecarboxylic acid And / or a thermal acid generator such as 2,4,4,6-tetrabromocyclohexadienone, benzoin tosylate, 2-nitrobenzyl tosylate, and organic sulfonic acid alkyl ester can be added.
- the addition amount of the catalyst is 0.0001 to 20% by mass, preferably 0.0005 to 10% by mass, and more preferably 0.001 to 3% by mass with respect to the CNT dispersant.
- the method for preparing the CNT-containing composition for forming the undercoat layer is not particularly limited, and CNT and a solvent, and a dispersant, a matrix polymer, and a crosslinking agent used as necessary are mixed in any order.
- a dispersion may be prepared.
- this treatment can further improve the CNT dispersion ratio.
- the dispersion treatment include mechanical treatment, wet treatment using a ball mill, bead mill, jet mill, and the like, and ultrasonic treatment using a bath-type or probe-type sonicator. In particular, wet treatment using a jet mill. Or sonication is preferred.
- the time for the dispersion treatment is arbitrary, but is preferably about 1 minute to 10 hours, and more preferably about 5 minutes to 5 hours. At this time, heat treatment may be performed as necessary.
- a crosslinking agent and / or matrix polymer you may add these, after preparing the mixture which consists of a dispersing agent, CNT, and a solvent.
- the undercoat foil of the present invention can be produced by applying the CNT-containing composition described above to at least one surface of a current collecting substrate, and naturally or heat-drying it to form an undercoat layer. At this time, it is preferable to apply the CNT-containing composition to the entire surface of the current collecting substrate and form an undercoat layer on the entire surface of the current collecting substrate.
- the basis weight of the undercoat layer per one surface of the current collector substrate is set to 0 in order to efficiently join the undercoat foil and a metal tab described later by welding such as ultrasonic welding at the undercoat layer portion of the foil. .1g / m 2 or less, preferably 0.09 g / m 2 or less, and more preferably less than 0.05 g / m 2.
- the weight per unit area of the undercoat layer is preferably 0.001 g / m 2 or more, more preferably 0.005 g / m 2 or more, even more preferably 0.01 g / m 2 or more, further preferably 0.015 g / m 2 or more.
- the thickness of the undercoat layer is not particularly limited as long as the above weight per unit area is satisfied. However, in consideration of reducing the welding efficiency and the internal resistance of the obtained device, it is preferably 0.01 to 10 ⁇ m.
- the basis weight of the undercoat layer in the present invention is the ratio of the mass (g) of the undercoat layer to the area (m 2 ) of the undercoat layer.
- the area is The area is only the undercoat layer and does not include the area of the current collector substrate exposed between the undercoat layers formed in a pattern.
- the mass of the undercoat layer is obtained by, for example, cutting a test piece of an appropriate size from the undercoat foil, measuring its mass W0, and then peeling off the undercoat layer from the undercoat foil and peeling off the undercoat layer.
- the mass W1 is measured and calculated from the difference (W0-W1), or the mass W2 of the current collecting substrate is measured in advance, and then the mass W3 of the undercoat foil on which the undercoat layer is formed is measured.
- the difference (W3 ⁇ W2) can be calculated.
- Examples of the method for removing the undercoat layer include a method of immersing the undercoat layer in a solvent in which the undercoat layer dissolves or swells, and wiping the undercoat layer with a cloth or the like.
- the basis weight can be adjusted by a known method. For example, when an undercoat layer is formed by coating, the solid content concentration of the coating liquid (CNT-containing composition) for forming the undercoat layer, the number of coatings, the clearance of the coating liquid inlet of the coating machine, etc. It can be adjusted by changing. To increase the weight per unit area, increase the solid content concentration, increase the number of coatings, or increase the clearance. When it is desired to reduce the basis weight, the solid content concentration is decreased, the number of coatings is decreased, or the clearance is decreased.
- the current collecting substrate may be appropriately selected from those conventionally used as a current collecting substrate for energy storage device electrodes.
- a current collecting substrate for energy storage device electrodes For example, copper, aluminum, nickel, gold, silver and alloys thereof, carbon materials, metals
- a thin film such as an oxide or a conductive polymer can be used, but when an electrode structure is produced by applying welding such as ultrasonic welding, it is made of copper, aluminum, nickel, gold, silver and alloys thereof. It is preferable to use a metal foil.
- the thickness of the current collector substrate is not particularly limited, but is preferably 1 to 100 ⁇ m in the present invention.
- Examples of the method for applying the CNT-containing composition include spin coating, dip coating, flow coating, ink jet, spray coating, bar coating, gravure coating, slit coating, roll coating, and flexographic printing. , Transfer printing method, brush coating, blade coating method, air knife coating method, etc., but from the viewpoint of work efficiency etc., inkjet method, casting method, dip coating method, bar coating method, blade coating method, roll coating method The gravure coating method, flexographic printing method and spray coating method are preferred.
- the temperature for drying by heating is also arbitrary, but is preferably about 50 to 200 ° C, more preferably about 80 to 150 ° C.
- the energy storage device electrode of the present invention can be produced by forming an active material layer on the undercoat layer of the undercoat foil.
- an active material the various active materials conventionally used for the energy storage device electrode can be used.
- a chalcogen compound capable of adsorbing / leaving lithium ions or a lithium ion-containing chalcogen compound, a polyanion compound, a simple substance of sulfur and a compound thereof may be used as a positive electrode active material. it can.
- Examples of the chalcogen compound that can adsorb and desorb lithium ions include FeS 2 , TiS 2 , MoS 2 , V 2 O 6 , V 6 O 13 , and MnO 2 .
- Examples of the lithium ion-containing chalcogen compound include LiCoO 2 , LiMnO 2 , LiMn 2 O 4 , LiMo 2 O 4 , LiV 3 O 8 , LiNiO 2 , Li x Ni y M 1-y O 2 (where M is Co Represents at least one metal element selected from Mn, Ti, Cr, V, Al, Sn, Pb, and Zn, 0.05 ⁇ x ⁇ 1.10, 0.5 ⁇ y ⁇ 1.0) Etc.
- Examples of the polyanionic compound include LiFePO 4 .
- Examples of the sulfur compound include Li 2 S and rubeanic acid.
- the negative electrode active material constituting the negative electrode at least one element selected from alkali metals, alkali alloys, and elements of Groups 4 to 15 of the periodic table that occlude / release lithium ions, oxides, sulfides, nitrides Or a carbon material capable of reversibly occluding and releasing lithium ions can be used.
- the alkali metal include Li, Na, and K.
- the alkali metal alloy include Li—Al, Li—Mg, Li—Al—Ni, Na—Hg, and Na—Zn.
- Examples of the simple substance of at least one element selected from Group 4 to 15 elements of the periodic table that store and release lithium ions include silicon, tin, aluminum, zinc, and arsenic.
- examples of the oxide include tin silicon oxide (SnSiO 3 ), lithium bismuth oxide (Li 3 BiO 4 ), lithium zinc oxide (Li 2 ZnO 2 ), and lithium titanium oxide (Li 4 Ti 5 O 12 ).
- examples of the sulfide include lithium iron sulfide (Li x FeS 2 (0 ⁇ x ⁇ 3)) and lithium copper sulfide (Li x CuS (0 ⁇ x ⁇ 3)).
- the carbon material capable of reversibly occluding and releasing lithium ions include graphite, carbon black, coke, glassy carbon, carbon fiber, carbon nanotube, and a sintered body thereof.
- a carbonaceous material can be used as an active material.
- the carbonaceous material include activated carbon and the like, for example, activated carbon obtained by carbonizing a phenol resin and then activating treatment.
- the active material layer can be formed by applying the active material, binder polymer, and, if necessary, an electrode slurry containing the solvent as described above onto the undercoat layer, and naturally or by heating and drying.
- the formation part of the active material layer may be appropriately set according to the cell form of the device to be used, and may be all or part of the surface of the undercoat layer. Is used as an electrode structure joined by welding such as ultrasonic welding, it is preferable to form an active material layer by applying electrode slurry to a part of the surface of the undercoat layer in order to leave a weld. In particular, in a laminate cell application, it is preferable to form an active material layer by applying an electrode slurry to the remaining part of the undercoat layer other than the periphery.
- the binder polymer can be appropriately selected from known materials and used, for example, polyvinylidene fluoride (PVdF), polyvinylpyrrolidone, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride- Hexafluoropropylene copolymer [P (VDF-HFP)], vinylidene fluoride-trichloroethylene copolymer [P (VDF-CTFE)], polyvinyl alcohol, polyimide, ethylene-propylene-diene ternary copolymer Examples thereof include conductive polymers such as coalescence, styrene-butadiene rubber, carboxymethyl cellulose (CMC), polyacrylic acid (PAA), and polyaniline.
- PVdF polyvinylidene fluoride
- PVdF polyvinylidene fluoride
- PVDF-HFP vinylidene fluoride- Hexafluor
- the added amount of the binder polymer is preferably 0.1 to 20 parts by mass, particularly 1 to 10 parts by mass with respect to 100 parts by mass of the active material.
- the solvent include the solvents exemplified in the above CNT-containing composition, and it may be appropriately selected according to the type of the binder, but NMP is suitable in the case of a water-insoluble binder such as PVdF. In the case of a water-soluble binder such as PAA, water is preferred.
- the electrode slurry may contain a conductive additive.
- the conductive assistant include carbon black, ketjen black, acetylene black, carbon whisker, carbon fiber, natural graphite, artificial graphite, titanium oxide, ruthenium oxide, aluminum, nickel and the like.
- Examples of the method for applying the electrode slurry include the same method as that for the CNT-containing composition described above.
- the temperature for drying by heating is arbitrary, but is preferably about 50 to 400 ° C, more preferably about 80 to 150 ° C.
- the electrode can be pressed as necessary.
- a generally adopted method can be used, but a die pressing method and a roll pressing method are particularly preferable.
- the press pressure in the roll press method is not particularly limited, but is preferably 0.2 to 3 ton / cm.
- An energy storage device includes the above-described energy storage device electrode, and more specifically includes at least a pair of positive and negative electrodes, a separator interposed between these electrodes, and an electrolyte. And at least one of the positive and negative electrodes is composed of the energy storage device electrode described above. Since this energy storage device is characterized by using the above-described energy storage device electrode as an electrode, other device constituent members such as a separator and an electrolyte can be appropriately selected from known materials and used. . Examples of the separator include a cellulose separator and a polyolefin separator.
- the electrolyte may be either liquid or solid, and may be either aqueous or non-aqueous, but the energy storage device electrode of the present invention has practically sufficient performance even when applied to a device using a non-aqueous electrolyte. Can be demonstrated.
- non-aqueous electrolyte examples include a non-aqueous electrolyte obtained by dissolving an electrolyte salt in a non-aqueous organic solvent.
- electrolyte salts include lithium salts such as lithium tetrafluoroborate, lithium hexafluorophosphate, lithium perchlorate, and lithium trifluoromethanesulfonate; tetramethylammonium hexafluorophosphate, tetraethylammonium hexafluorophosphate, tetrapropylammonium hexa Quaternary ammonium salts such as fluorophosphate, methyltriethylammonium hexafluorophosphate, tetraethylammonium tetrafluoroborate, tetraethylammonium perchlorate, lithium imides such as lithium bis (trifluoromethanesulfonyl) imide, lithium bis (fluo
- non-aqueous organic solvent examples include alkylene carbonates such as propylene carbonate, ethylene carbonate, and butylene carbonate; dialkyl carbonates such as dimethyl carbonate, methyl ethyl carbonate, and diethyl carbonate; nitriles such as acetonitrile; and amides such as dimethylformamide. .
- the form of the energy storage device is not particularly limited, and conventionally known various types of cells such as a cylindrical type, a flat wound square type, a laminated square type, a coin type, a flat wound laminated type, and a laminated laminate type are adopted. can do.
- the above-described energy storage device electrode of the present invention may be used by punching it into a predetermined disk shape. For example, in a lithium ion secondary battery, a predetermined number of lithium foils punched into a predetermined shape are placed on a lid to which a coin cell washer and spacer are welded, and a separator of the same shape impregnated with an electrolyte is stacked thereon. Further, from above, the energy storage device electrode of the present invention can be overlaid with the active material layer down, a case and a gasket can be placed, and sealed with a coin cell caulking machine.
- the electrode in which the active material layer is formed on a part of the surface of the undercoat layer has a metal in the portion (welded part) where the undercoat layer is formed and the active material layer is not formed.
- An electrode structure obtained by welding with a tab may be used.
- one or a plurality of electrodes constituting the electrode structure may be used, but generally a plurality of positive and negative electrodes are used.
- the plurality of electrodes for forming the positive electrode are preferably alternately stacked one by one with the plurality of electrode plates for forming the negative electrode, and the separator described above is interposed between the positive electrode and the negative electrode. It is preferable to make it. Even if the metal tab is welded at the welded portion of the outermost electrode of the plurality of electrodes, the metal tab is welded with the metal tab sandwiched between the welded portions of any two adjacent electrodes among the plurality of electrodes. Also good.
- the material of the metal tab is not particularly limited as long as it is generally used for energy storage devices.
- metal such as nickel, aluminum, titanium, copper; stainless steel, nickel alloy, aluminum alloy, An alloy such as a titanium alloy or a copper alloy can be used.
- an alloy including at least one metal selected from aluminum, copper, and nickel is preferable.
- the shape of the metal tab is preferably a foil shape, and the thickness is preferably about 0.05 to 1 mm.
- a known method used for metal-to-metal welding can be used. Specific examples thereof include TIG welding, spot welding, laser welding, and ultrasonic welding. Since the undercoat layer of the invention has a basis weight particularly suitable for ultrasonic welding, it is preferable to join the electrode and the metal tab by ultrasonic welding.
- a technique of ultrasonic welding for example, a plurality of electrodes are arranged between an anvil and a horn, a metal tab is arranged in a welded portion, and ultrasonic welding is applied to collect a plurality of electrodes. The technique of welding first and then welding a metal tab is mentioned.
- the metal tab and the electrode are welded at the above-mentioned welded portion, but also the plurality of electrodes are formed with an undercoat layer and no active material layer is formed.
- the parts will be ultrasonically welded together.
- the pressure, frequency, output, processing time, and the like during welding are not particularly limited, and may be set as appropriate in consideration of the material to be used and the basis weight of the undercoat layer.
- the electrode structure produced as described above is housed in a laminate pack, and after injecting the above-described electrolyte, heat sealing is performed to obtain a laminate cell.
- the energy storage device thus obtained has at least one electrode structure including a metal tab and one or a plurality of electrodes.
- the electrode includes a current collector substrate and the current collector.
- An undercoat layer formed on at least one surface of the electric substrate; and an active material layer formed on a part of the surface of the undercoat layer.
- the undercoat layer and the active material layer are not formed.
- a configuration in which the portions are ultrasonically welded to each other, and at least one of the electrodes is ultrasonically welded to the metal tab in the portion where the undercoat layer is formed and the active material layer is not formed Be equipped Those were.
- Ultrasonic welding machine (ultrasonic welding test) Apparatus: Nippon Emerson Co., Ltd., 2000Xea 40: 0.8 / 40MA-XaeStand (4) Charge / discharge measuring device (rechargeable battery evaluation) Apparatus: HJ1001SM8A manufactured by Hokuto Denko Corporation (5) Micrometer (Binder and active layer thickness measurement) Device: IR54 manufactured by Mitutoyo Corporation (6) Homodisper (mixing of electrode slurry) Apparatus: T.W. K.
- This mixture was subjected to ultrasonic treatment at room temperature (approximately 25 ° C.) for 30 minutes using a probe-type ultrasonic irradiation device to obtain a black MWCNT-containing dispersion liquid in which MWCNT was uniformly dispersed without a precipitate.
- a probe-type ultrasonic irradiation device To 50 g of the obtained MWCNT-containing dispersion, 3.88 g of Aron A-10H (Toagosei Co., Ltd., solid concentration 25.8 mass%), which is an aqueous solution containing polyacrylic acid (PAA), and 2-propanol 46. 12 g was added and stirred to obtain an undercoat liquid A1.
- the obtained undercoat solution A1 is uniformly spread on a current collector aluminum foil (thickness 20 ⁇ m) with a wire bar coater (OSP13, wet film thickness 13 ⁇ m), and then dried at 120 ° C. for 20 minutes to form an undercoat layer.
- the undercoat foil B1 was formed. 20 sheets of undercoat foil cut into 5 ⁇ 10 cm were prepared. After measuring the mass, the undercoat layer was scraped off with a paper soaked with a 1: 1 (mass ratio) mixture of 2-propanol and water. The mass of the metal foil was measured, and the basis weight of the undercoat layer calculated from the difference in mass before and after scraping was 0.167 g / m 2 . Furthermore, undercoat liquid A1 was similarly applied to the surface on the opposite side of the obtained undercoat foil B1 and dried to prepare undercoat foil C1 having an undercoat layer formed on both sides of the aluminum foil.
- Example 1-1 The undercoat solution A1 prepared in Comparative Example 1-1 was diluted 2-fold with 2-propanol to obtain an undercoat solution A2. Except that the obtained undercoat liquid A2 was used, undercoat foils B2 and C2 were prepared in the same manner as in Comparative Example 1-1, and the basis weight of the undercoat foil B2 was calculated to be 0.088 g / m. 2 .
- Example 1-2 The undercoat solution A1 prepared in Comparative Example 1-1 was diluted 4-fold with 2-propanol to obtain an undercoat solution A3. Except for using the obtained undercoat liquid A3, undercoat foils B3 and C3 were prepared in the same manner as in Comparative Example 1-1, and the basis weight of the undercoat foil B3 was calculated to be 0.042 g / m. 2
- Example 1-3 The undercoat solution A1 prepared in Comparative Example 1-1 was diluted 6-fold with 2-propanol to obtain an undercoat solution A4. Except for using the obtained undercoat liquid A4, undercoat foils B4 and C4 were produced in the same manner as in Comparative Example 1-1, and the basis weight of the undercoat foil B4 was calculated to be 0.032 g / m. 2
- Aron A-30 (Toagosei Co., Ltd., solid content concentration 31.6% by mass), which is an aqueous solution containing ammonium polyacrylate (PAA-NH 4 ), 0.2 g of sodium alginate (Na alginate) (Kanto Chemical Co., Inc., deer grade 1) and 49.1 g of distilled water were added and stirred to obtain an undercoat solution A5.
- the obtained undercoat solution A5 is uniformly spread on a current collector aluminum foil (thickness 20 ⁇ m) with a wire bar coater (OSP13, wet film thickness 13 ⁇ m) and then dried at 120 ° C. for 20 minutes to form an undercoat layer.
- the undercoat foil B5 was formed. Prepare 20 sheets of undercoat foil cut into 5 ⁇ 10 cm, measure the mass, measure the mass of the metal foil with the undercoat layer scraped off with water-soaked paper, and the mass difference before and after scraping From the result, the basis weight of the undercoat layer was calculated to be 0.113 g / m 2 . Furthermore, undercoat liquid A5 was similarly applied to the surface opposite to the obtained undercoat foil B5 and dried to prepare undercoat foil C5 having an undercoat layer formed on both sides of the aluminum foil.
- undercoat foils B6 and C6 were prepared in the same manner as in Comparative Example 1-2, and the basis weight of the undercoat foil B6 was calculated. 0.035 g / m 2 .
- Undercoat foils B7 and C7 were prepared in the same manner as in Comparative Example 1-2 except that a wire bar coater (OSP3, wet film thickness 3 ⁇ m) was used, and the basis weight of the undercoat foil B7 was calculated. 0.027 g / m 2 .
- OSP3 wire bar coater
- undercoat foils B8 and C8 were produced in the same manner as in Comparative Example 1-2, and the basis weight of the undercoat foil B8 was calculated. .016 g / m 2 .
- Undercoat liquid A9 and undercoat foils B9 and C9 were prepared in the same manner as Comparative Example 1-1 except that acetylene black (AB, Denka Black, manufactured by Denki Kagaku Kogyo Co., Ltd.) was used instead of MWCNT.
- the basis weight of the undercoat foil B9 was calculated to be 0.166 g / m 2 .
- undercoat liquid A10, undercoat foils B10 and C10 were prepared in the same manner as in Example 1-1 except that AB was used instead of MWCNT, and the basis weight of undercoat foil B10 was calculated. It was 081 g / m 2 .
- Undercoat liquid A11 and undercoat foils B11 and C11 were prepared and the basis weight of undercoat foil B11 was calculated in the same manner as in Example 1-2 except that AB was used instead of MWCNT. It was 036 g / m 2 .
- undercoat liquid A12, undercoat foils B12 and C12 were prepared and the basis weight of undercoat foil B12 was calculated in the same manner as in Example 1-3, except that AB was used instead of MWCNT. It was 026 g / m 2 .
- undercoat foils B15 and C15 were prepared in the same manner as in Example 1-5, and the basis weight of the undercoat foil B15 was calculated to be 0.044 g / m 2 . there were.
- undercoat foils B16 and C16 were prepared in the same manner as in Example 1-6, and the basis weight of the undercoat foil B16 was calculated to be 0.029 g / m 2 . there were.
- the basis weight of the undercoat layer needs to be 0.1 g / m 2 or less.
- Undercoat foil C17 was produced in the same manner as in Example 1-1, except that copper foil (thickness: 15 ⁇ m) was used instead of aluminum foil.
- Undercoat foil C18 was produced in the same manner as in Example 1-2, except that copper foil (thickness: 15 ⁇ m) was used instead of aluminum foil.
- Undercoat foil C19 was produced in the same manner as in Example 1-3, except that copper foil (thickness: 15 ⁇ m) was used instead of aluminum foil.
- the basis weight of the undercoat layer is 0.1 g / It can be seen that m 2 or less is necessary.
- the slurry was mixed for 60 seconds at a peripheral speed of 20 m / sec using a thin-film swirl type high-speed mixer, and further defoamed at 1000 rpm for 2 minutes with a rotating / revolving mixer, so that an electrode slurry (solid content concentration 58 mass%) was obtained.
- LMO: PVdF: AB 90: 8: 2 (mass ratio)).
- the obtained electrode slurry was spread evenly (wet film thickness 100 ⁇ m) on the entire surface of the undercoat foil B1 prepared in Comparative Example 1-1 and coated with an undercoat layer on one side, and then at 80 ° C. for 30 minutes. Then, it was dried at 120 ° C. for 30 minutes to form an active material layer on the undercoat layer, and further crimped with a roll press to produce an electrode D1 having an active material layer thickness of 30 ⁇ m.
- the obtained electrode D1 was punched into a disk shape having a diameter of 10 mm, and the mass was measured. Then, the electrode D1 was vacuum-dried at 100 ° C. for 15 hours, and transferred to a glove box filled with argon. A stack of 2032-type coin cell (made by Hosen Co., Ltd.) washer and spacer welded with 6 sheets of lithium foil (Honjo Chemical Co., Ltd., thickness 0.17 mm) punched out to a diameter of 14 mm.
- Example 2-1 An electrode D2 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B2 produced in Example 1-1 was used.
- Example 2-2 An electrode D3 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B3 produced in Example 1-2 was used.
- Example 2-3 An electrode D4 and a secondary battery for test were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B4 produced in Example 1-3 was used.
- Comparative Example 2-2 An electrode D5 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B5 produced in Comparative Example 1-2 was used.
- Example 2-4 An electrode D6 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B6 produced in Example 1-4 was used.
- Example 2-5 An electrode D7 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B7 produced in Example 1-5 was used.
- Example 2-6 An electrode D8 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B8 produced in Example 1-6 was used.
- Comparative Example 2-3 An electrode D9 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B9 produced in Comparative Example 1-3 was used.
- Comparative Example 2-4 An electrode D10 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B10 produced in Comparative Example 1-4 was used.
- Comparative Example 2-7 An electrode D13 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B13 produced in Comparative Example 1-7 was used.
- Comparative Example 2-8 An electrode D14 and a test secondary battery were produced in the same manner as in Comparative Example 2-1, except that the undercoat foil B14 produced in Comparative Example 1-8 was used.
- the average voltage drops drastically when using AB as a carbon material, and in some cases a solid aluminum foil It can be seen that, while the voltage is lower than that of the secondary battery using the MWCNT, the average voltage is high in the case of using the MWCNT as the carbon material, and a sufficiently low resistance is achieved.
- the slurry was mixed for 60 seconds at a peripheral speed of 20 m / sec using a thin-film swirl type high-speed mixer, and further defoamed at 1000 rpm for 2 minutes with a rotating / revolving mixer, so that an electrode slurry (solid content concentration 58 mass%) was obtained.
- LMO: PVdF: AB 90: 8: 2 (mass ratio)).
- the undercoat foil B3 produced in Example 1-2 and coated with an undercoat layer on one side was cut into a rectangular shape having a short side of 8 cm and a long side of 20 cm.
- the electrode slurry obtained above was uniformly spread in a 20 cm strip with a width of 5 cm in the center part with 1.5 cm on both sides of the short side, then at 80 ° C. for 30 minutes and then at 120 ° C. for 30 minutes.
- an active material layer was formed on the undercoat layer, and further crimped by a roll press to produce an electrode sheet having an active material layer thickness of 30 ⁇ m.
- the basis weight of the active material was 7.58 mg / cm 2 as a result of measuring by punching out into a disk shape having a diameter of 10 mm and measuring the mass.
- the obtained electrode sheet is punched out so that the area where the active material layer is applied is 4 cm ⁇ 5 cm and the area where the active material layer on the long side is not applied is 1.5 cm ⁇ 1 cm.
- a positive electrode E1 was obtained.
- An aluminum tab (width 4 mm ⁇ 6.5 cm, thickness 0.1 mm, manufactured by Hosen Co., Ltd.) was welded to the portion where the undercoat layer was formed and the active material layer was not formed using an ultrasonic welding machine. .
- the slurry was mixed for 60 seconds at a peripheral speed of 20 m / sec using a thin-film swirl type high-speed mixer, and further defoamed at 1000 rpm for 2 minutes with a rotating / revolving mixer to obtain an electrode slurry (solid content concentration of 40% by mass).
- Gr: LA-132: AB 94: 4: 2 (mass ratio)).
- Solid copper foil (thickness 18 ⁇ m) was cut into a rectangular shape with a short side of 8 cm ⁇ long side of 20 cm. On top of that, the electrode slurry obtained above was uniformly spread in a 20 cm strip with a width of 5 cm in the center part with 1.5 cm on both sides of the short side, then at 80 ° C.
- an active material layer was formed on the undercoat layer, and further crimped with a roll press to produce an electrode sheet with an active material layer thickness of 20 ⁇ m.
- the basis weight of the active material was 3.54 mg / cm 2 as a result of measurement by punching into a disk shape having a diameter of 10 mm and measuring the mass.
- coated becomes 4.4 cm x 5.4 cm, and the site
- a copper tab (width 4 mm ⁇ 6.5 cm, thickness 0.1 mm, manufactured by Hosen Co., Ltd.) plated with nickel was welded to the portion where the active material layer was not formed with an ultrasonic welding machine.
- the bag After covering the electrode application surface with the positive electrode E1 using a separator (manufactured by Celgard Co., Ltd., 2400), the bag is closed, and then the positive electrode E1 and the negative electrode F1 are laminated so that the electrode application surface faces each other and laminating.
- the tab was fixed to the film (Dai Nippon Printing Co., Ltd.) by thermocompression bonding. After drying at 100 ° C. for 9 hours under vacuum, it was transferred to a glove box filled with argon.
- Example 3-1 A positive electrode E2, a negative electrode F2, and a test laminate cell were produced in the same manner as in Example 3-1, except that solid aluminum foil was used. Basis weight of the positive and negative electrodes were respectively 7.35 mg / cm 2 and 3.49mg / cm 2.
- Example 3-1 and Comparative Example 3-1 were evaluated under the following conditions.
- Table 4 shows the average voltage and discharge capacity during 1C discharge.
- ⁇ Current 0.1C constant current charge / discharge after 2 cycles, 0.5C constant current charge, 0.5C, 3C, 5C, 10C constant current discharge (LMO capacity is 148 mAh / g, discharge rate every 3 cycles Was raised)
- Cutoff voltage 4.50V-3.00V
- Temperature Room temperature
- Example 3-1 in the undercoat foil having a basis weight of 0.1 g / m 2 or less and capable of ultrasonic welding, the undercoat layer is peeled off or the undercoat layer is not applied.
- a laminate cell can be produced by welding an aluminum tab to a portion where an undercoat layer is formed and an active material layer is not formed, without the need for a step such as producing a portion.
- Table 3 in the 1C discharge, it is understood that the solid aluminum foil has a low voltage and hardly discharged, whereas the undercoat foil has a low resistance and can be discharged. .
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Abstract
Description
この要求に応えるための一つの方策として、活物質層と集電基板との間にアンダーコート層を配置して、活物質層および集電基板の接着性を強固にするとともに、それらの接触界面の抵抗を下げることが提案されている(例えば、特許文献1参照)。
金属タブは、通常、集電基板に溶接され、アンダーコート層が形成された電極でも、集電基板上のアンダーコート層および活物質層が形成されていない部位で金属タブとの溶接が行われる(例えば、特許文献1参照)。
しかし、アンダーコート層を一部分形成しない場合、集電基板の汎用性が低下し、各種電極ごとに異なる集電基板を用意する必要が生じる。一方、一旦形成したアンダーコート層等を剥離する方法では、一工程増加するため、デバイスの生産性が低下する。
特に、デバイスの高容量化を図るため、電極板が複数枚重ね合わせて用いられる場合には、上記のような集電基板露出部分の形成に関する問題がより大きくなる。
この文献では、集電基板の片面におけるアンダーコート層の目付量は0.05~3g/m2に設定されている。
とりわけ、より高い生産性でより高い安全性の蓄電デバイスを製造できる方法は、低価格かつ高安全性という近年の市場ニーズを満たす製品製造に直接的に貢献し得ることから、当該技術分野において強く求められている。
しかし、本発明者らの検討によれば、特許文献2に係る製造方法では、その条件を満たす場合であっても炭素材料の種類によっては再現性よく超音波溶接ができないことがあった。
1. 集電基板と、この集電基板の少なくとも一方の面に形成されたアンダーコート層とを有し、前記アンダーコート層が、カーボンナノチューブを含み、かつ、その前記集電基板の一面あたりの目付量が、0.1g/m2以下であることを特徴とするエネルギー貯蔵デバイス電極用アンダーコート箔、
2. 前記アンダーコート層が、前記集電基板の少なくとも一方の面に、当該面全体を覆う態様で形成された1のエネルギー貯蔵デバイス電極用アンダーコート箔、
3. 前記アンダーコート層が、マトリックス高分子を含む1または2のエネルギー貯蔵デバイス電極用アンダーコート箔、
4. 前記アンダーコート層が、カーボンナノチューブ分散剤を含む1~3のいずれかのエネルギー貯蔵デバイス電極用アンダーコート箔、
5. 前記カーボンナノチューブ分散剤が、トリアリールアミン系高分岐ポリマーまたは側鎖にオキサゾリン基を含むビニル系ポリマーである4のエネルギー貯蔵デバイス電極用アンダーコート箔、
6. 前記目付量が、0.05g/m2未満である1~5のいずれかのエネルギー貯蔵デバイス電極用アンダーコート箔、
7. 前記アンダーコート層の厚みが、0.01~10μmである1~6のいずれかのエネルギー貯蔵デバイス電極用アンダーコート箔、
8. 前記集電基板が、アルミニウム箔または銅箔である1~7のいずれかのエネルギー貯蔵デバイス電極用アンダーコート箔、
9. 1~8のいずれかのエネルギー貯蔵デバイス電極用アンダーコート箔と、そのアンダーコート層の表面の一部または全部に形成された活物質層とを有するエネルギー貯蔵デバイス電極、
10. 前記活物質層が、前記アンダーコート層の表面の一部に形成された9のエネルギー貯蔵デバイス電極、
11. 前記活物質層が、前記アンダーコート層の周縁を残し、それ以外の部分全体を覆う態様で形成された10のエネルギー貯蔵デバイス電極、
12. 9~11のいずれかのエネルギー貯蔵デバイス電極を備えるエネルギー貯蔵デバイス、
13. 一枚または複数枚の請求項10または11記載の電極と、金属タブとを備えて構成される電極構造体を少なくとも一つ有し、前記電極の少なくとも一枚が、前記アンダーコート層が形成され、かつ、前記活物質層が形成されていない部分で前記金属タブと超音波溶接されているエネルギー貯蔵デバイス、
14. 前記金属タブが、アルミニウム、銅およびニッケルから選ばれる少なくとも1種の金属を含んで構成される10のエネルギー貯蔵デバイス、
15. 一枚または複数枚の10または11の電極を用いたエネルギー貯蔵デバイスの製造方法であって、前記電極の少なくとも一枚を、前記アンダーコート層が形成され、かつ、前記活物質層が形成されていない部分で金属タブと超音波溶接する工程を有するエネルギー貯蔵デバイスの製造方法
を提供する。
このアンダーコート箔を有する電極を用いることで、低抵抗なエネルギー貯蔵デバイスおよびその簡便かつ効率的な製造方法を提供できる。
本発明に係るエネルギー貯蔵デバイス電極用アンダーコート箔(以下、アンダーコート箔という)は、集電基板と、この集電基板の少なくとも一方の面に形成されたアンダーコート層とを有し、アンダーコート層が、カーボンナノチューブを含み、かつ、その集電基板の一面あたりの目付量が、0.1g/m2以下のものである。
CNTは、一般的に、アーク放電法、化学気相成長法(CVD法)、レーザー・アブレーション法等によって作製されるが、本発明に使用されるCNTはいずれの方法で得られたものでもよい。また、CNTには1枚の炭素膜(グラフェン・シート)が円筒状に巻かれた単層CNT(以下、SWCNTとも略記する)と、2枚のグラフェン・シートが同心円状に巻かれた2層CNT(以下、DWCNTとも略記する)と、複数のグラフェン・シートが同心円状に巻かれた多層CNT(以下、MWCNTとも略記する)とがあるが、本発明においては、SWCNT、DWCNT、MWCNTをそれぞれ単体で、または複数を組み合わせて使用できる。
なお、上記の方法でSWCNT、DWCNTまたはMWCNTを作製する際には、ニッケル、鉄、コバルト、イットリウムなどの触媒金属が残存することがあるため、この不純物を除去するための精製を必要とする場合がある。不純物の除去には、硝酸、硫酸などによる酸処理とともに超音波処理が有効である。しかし、硝酸、硫酸などによる酸処理ではCNTを構成するπ共役系が破壊され、CNT本来の特性が損なわれてしまう可能性があるため、適切な条件で精製して使用することが望ましい。
溶媒としては、従来、CNT含有組成物の調製に用いられるものであれば、特に限定されるものではなく、例えば、水;テトラヒドロフラン(THF)、ジエチルエーテル、1,2-ジメトキシエタン(DME)などのエーテル類;塩化メチレン、クロロホルム、1,2-ジクロロエタンなどのハロゲン化炭化水素類;N,N-ジメチルホルムアミド(DMF)、N,N-ジメチルアセトアミド(DMAc)、N-メチル-2-ピロリドン(NMP)などのアミド類;アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノンなどのケトン類;メタノール、エタノール、イソプロパノール、n-プロパノールなどのアルコール類;n-ヘプタン、n-ヘキサン、シクロヘキサンなどの脂肪族炭化水素類;ベンゼン、トルエン、キシレン、エチルベンゼンなどの芳香族炭化水素類;エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、プロピレングリコールモノメチルエーテルなどのグリコールエーテル類;エチレングリコール、プロピレングリコールなどのグリコール類等の有機溶媒が挙げられ、これらの溶媒は、それぞれ単独で、または2種以上混合して用いることができる。
特に、CNTの孤立分散の割合を向上させ得るという点から、水、NMP、DMF、THF、メタノール、イソプロパノールが好ましく、これらの溶媒は、それぞれ単独で、または2種以上混合して用いることができる。
マトリックス高分子の含有量は、特に限定されるものではないが、組成物中に、0.0001~99質量%程度とすることが好ましく、0.001~90質量%程度とすることがより好ましい。
なお、R41がフェニル基の場合、後述する酸性基導入法において、ポリマー製造後に酸性基を導入する手法を用いた場合、このフェニル基上に酸性基が導入される場合もある。
上記炭素数1~5の分岐構造を有していてもよいアルキル基としては、上記で例示したものと同様のものが挙げられる。
炭素数1~5の分岐構造を有していてもよいアルキル基としては、メチル基、エチル基、n-プロピル基、イソプロピル基、n-ブチル基、sec-ブチル基、tert-ブチル基、n-ペンチル基等が挙げられる。
炭素数1~5の分岐構造を有していてもよいアルコキシ基としては、メトキシ基、エトキシ基、n-プロポキシ基、イソプロポキシ基、n-ブトキシ基、sec-ブトキシ基、tert-ブトキシ基、n-ペントキシ基等が挙げられる。
カルボキシル基、スルホ基、リン酸基およびホスホン酸基の塩としては、ナトリウム,カリウムなどのアルカリ金属塩;マグネシウム,カルシウム等の2族金属塩;アンモニウム塩;プロピルアミン、ジメチルアミン、トリエチルアミン、エチレンジアミンなどの脂肪族アミン塩;イミダゾリン、ピペラジン、モルホリンなどの脂環式アミン塩;アニリン、ジフェニルアミンなどの芳香族アミン塩;ピリジニウム塩等が挙げられる。
なお、ハロゲン原子、炭素数1~5の分岐構造を有していてもよいアルキル基としては、上記式(2)~(7)で例示した基と同様のものが挙げられる。
なお、本発明における重量平均分子量は、ゲル浸透クロマトグラフィーによる測定値(ポリスチレン換算)である。
具体的な高分岐ポリマーとしては、下記式で示されるものが挙げられるが、これらに限定されるものではない。
オキサゾリンモノマーが有する重合性炭素-炭素二重結合含有基としては、重合性炭素-炭素二重結合を含んでいれば特に限定されるものではないが、重合性炭素-炭素二重結合を含む鎖状炭化水素基が好ましく、例えば、ビニル基、アリル基、イソプロペニル基などの炭素数2~8のアルケニル基等が好ましい。
ハロゲン原子、炭素数1~5の分岐構造を有していてもよいアルキル基としては、上記と同様のものが挙げられる。
炭素数6~20のアリール基の具体例としては、フェニル基、キシリル基、トリル基、ビフェニル基、ナフチル基等が挙げられる。
炭素数7~20のアラルキル基の具体例としては、ベンジル基、フェニルエチル基、フェニルシクロヘキシル基等が挙げられる。
このような水溶性のオキサゾリンポリマーは、上記式(13)で表されるオキサゾリンモノマーのホモポリマーでもよいが、水への溶解性をより高めるため、上記オキサゾリンモノマーと親水性官能基を有する(メタ)アクリル酸エステル系モノマーとの少なくとも2種のモノマーをラジカル重合させて得られたものであることが好ましい。
その他のモノマーの具体例としては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸ブチル、(メタ)アクリル酸2-エチルヘキシル、(メタ)アクリル酸ステアリル、(メタ)アクリル酸パーフルオロエチル、(メタ)アクリル酸フェニル等の(メタ)アクリル酸エステルモノマー;エチレン、プロピレン、ブテン、ペンテン等のα-オレフィン系モノマー;塩化ビニル、塩化ビニリデン、フッ化ビニル等のハロオレフィン系モノマー;スチレン、α-メチルスチレン等のスチレン系モノマー;酢酸ビニル、プロピオン酸ビニル等のカルボン酸ビニルエステル系モノマー;メチルビニルエーテル、エチルビニルエーテル等のビニルエーテル系モノマーなどが挙げられ、これらはそれぞれ単独で用いても、2種以上組み合わせて用いてもよい。
一方、得られるオキサゾリンポリマーの水溶性をより高めるという点から、モノマー成分における親水性官能基を有する(メタ)アクリル系モノマーの含有率は、10質量%以上が好ましく、20質量%以上がより好ましく、30質量%以上がより一層好ましい。
また、モノマー成分におけるその他の単量体の含有率は、上述のとおり、得られるオキサゾリンポリマーのCNT分散能に影響を与えない範囲であり、また、その種類によって異なるため一概には決定できないが、5~95質量%、好ましくは10~90質量%の範囲で適宜設定すればよい。
なお、溶液として市販されている場合、そのまま使用しても、目的とする溶媒に置換してから使用してもよい。
また、組成物中における分散剤の濃度は、CNTを溶媒に分散させ得る濃度であれば特に限定されるものではないが、組成物中に0.001~30質量%程度とすることが好ましく、0.002~20質量%程度とすることがより好ましい。
さらに、組成物中におけるCNTの濃度は、目的とするアンダーコート層の目付量や、要求される機械的、電気的、熱的特性などにおいて変化するものであり、また、少なくともCNTの一部が孤立分散し、本発明で規定される目付量でアンダーコート層を作製できる限り任意であるが、組成物中に0.0001~30質量%程度とすることが好ましく、0.001~20質量%程度とすることがより好ましく、0.001~10質量%程度とすることがより一層好ましい。
トリアリールアミン系高分岐ポリマーの架橋剤としては、例えば、メラミン系、置換尿素系、またはそれらのポリマー系架橋剤等が挙げられ、これら架橋剤は、それぞれ単独で、または2種以上混合して用いることができる。なお、好ましくは、少なくとも2個の架橋形成置換基を有する架橋剤であり、CYMEL(登録商標)、メトキシメチル化グリコールウリル、ブトキシメチル化グリコールウリル、メチロール化グリコールウリル、メトキシメチル化メラミン、ブトキシメチル化メラミン、メチロール化メラミン、メトキシメチル化ベンゾグアナミン、ブトキシメチル化ベンゾグアナミン、メチロール化ベンゾグアナミン、メトキシメチル化尿素、ブトキシメチル化尿素、メチロール化尿素、メトキシメチル化チオ尿素、メトキシメチル化チオ尿素、メチロール化チオ尿素等の化合物、およびこれらの化合物の縮合体が例として挙げられる。
オキサゾリン基と架橋反応を起こす化合物の具体例としては、酸触媒の存在下で架橋反応性を発揮する、ポリアクリル酸やそのコポリマー等の合成高分子およびカルボキシメチルセルロースやアルギン酸といった天然高分子の金属塩、加熱により架橋反応性を発揮する、上記合成高分子および天然高分子のアンモニウム塩等が挙げられるが、特に、酸触媒の存在下や加熱条件下で架橋反応性を発揮するポリアクリル酸ナトリウム、ポリアクリル酸リチウム、ポリアクリル酸アンモニウム、カルボキシメチルセルロースナトリウム、カルボキシメチルセルロースリチウム、カルボキシメチルセルロースアンモニウム等が好ましい。
自己架橋する架橋剤の具体例としては、酸触媒の存在下で架橋反応性を発揮する多官能アクリレート、テトラアルコキシシラン、ブロックイソシアネート基を有するモノマーおよび水酸基、カルボン酸、アミノ基の少なくとも1つを有するモノマーのブロックコポリマーなどが挙げられる。
本発明では、架橋反応を促進するための触媒として、p-トルエンスルホン酸、トリフルオロメタンスルホン酸、ピリジニウムp-トルエンスルホン酸、サリチル酸、スルホサリチル酸、クエン酸、安息香酸、ヒドロキシ安息香酸、ナフタレンカルボン酸等の酸性化合物、および/または2,4,4,6-テトラブロモシクロヘキサジエノン、ベンゾイントシレート、2-ニトロベンジルトシレート、有機スルホン酸アルキルエステル等の熱酸発生剤を添加することができる。
触媒の添加量はCNT分散剤に対して、0.0001~20質量%、好ましくは0.0005~10質量%、より好ましくは0.001~3質量%である。
この際、混合物を分散処理することが好ましく、この処理により、CNTの分散割合をより向上させることができる。分散処理としては、機械的処理である、ボールミル、ビーズミル、ジェットミル等を用いる湿式処理や、バス型やプローブ型のソニケータを用いる超音波処理が挙げられるが、特に、ジェットミルを用いた湿式処理や超音波処理が好適である。
分散処理の時間は任意であるが、1分間から10時間程度が好ましく、5分間から5時間程度がより好ましい。この際、必要に応じて加熱処理を施しても構わない。
なお、架橋剤および/またはマトリックス高分子を用いる場合、これらは、分散剤、CNTおよび溶媒からなる混合物を調製した後から加えてもよい。
この際、CNT含有組成物を集電基板の面全体に塗布し、アンダーコート層を集電基板面全面に形成することが好ましい。
本発明では、アンダーコート箔と後述する金属タブとを、箔のアンダーコート層部分で超音波溶接等の溶接によって効率よく接合させるため、集電基板の一面あたりのアンダーコート層の目付量を0.1g/m2以下、好ましくは0.09g/m2以下、より好ましくは0.05g/m2未満とする。
一方、アンダーコート層の機能を担保して優れた特性の電池を再現性よく得るため、集電基板の一面あたりのアンダーコート層の目付量を好ましくは0.001g/m2以上、より好ましくは0.005g/m2以上、より一層好ましくは0.01g/m2以上、さらに好ましくは0.015g/m2以上とする。
また、アンダーコート層の厚みは、上記目付量を満たす限り特に限定されるものではないが、溶接効率および得られるデバイスの内部抵抗を低減することを考慮すると、0.01~10μmが好ましい。
アンダーコート層の質量は、例えば、アンダーコート箔から適当な大きさの試験片を切り出し、その質量W0を測定し、その後、アンダーコート箔からアンダーコート層を剥離し、アンダーコート層を剥離した後の質量W1を測定し、その差(W0-W1)から算出する、あるいは、予め集電基板の質量W2を測定しておき、その後、アンダーコート層を形成したアンダーコート箔の質量W3を測定し、その差(W3-W2)から算出することができる。
アンダーコート層を剥離する方法としては、例えばアンダーコート層が溶解、もしくは膨潤する溶剤に、アンダーコート層を浸漬させ、布等でアンダーコート層をふき取るなどの方法が挙げられる。
目付量を多くしたい場合は、固形分濃度を高くしたり、塗布回数を増やしたり、クリアランスを大きくしたりする。目付量を少なくしたい場合は、固形分濃度を低くしたり、塗布回数を減らしたり、クリアランスを小さくしたりする。
集電基板の厚みは特に限定されるものではないが、本発明においては、1~100μmが好ましい。
加熱乾燥する場合の温度も任意であるが、50~200℃程度が好ましく、80~150℃程度がより好ましい。
ここで、活物質としては、従来、エネルギー貯蔵デバイス電極に用いられている各種活物質を用いることができる。
例えば、リチウム二次電池やリチウムイオン二次電池の場合、正極活物質としてリチウムイオンを吸着・離脱可能なカルコゲン化合物またはリチウムイオン含有カルコゲン化合物、ポリアニオン系化合物、硫黄単体およびその化合物等を用いることができる。
このようなリチウムイオンを吸着離脱可能なカルコゲン化合物としては、例えばFeS2、TiS2、MoS2、V2O6、V6O13、MnO2等が挙げられる。
リチウムイオン含有カルコゲン化合物としては、例えばLiCoO2、LiMnO2、LiMn2O4、LiMo2O4、LiV3O8、LiNiO2、LixNiyM1-yO2(但し、Mは、Co、Mn、Ti、Cr,V、Al、Sn、Pb、およびZnから選ばれる少なくとも1種以上の金属元素を表し、0.05≦x≦1.10、0.5≦y≦1.0)などが挙げられる。
ポリアニオン系化合物としては、例えばLiFePO4等が挙げられる。
硫黄化合物としては、例えばLi2S、ルベアン酸等が挙げられる。
アルカリ金属としては、Li、Na、K等が挙げられ、アルカリ金属合金としては、例えば、Li-Al、Li-Mg、Li-Al-Ni、Na-Hg、Na-Zn等が挙げられる。
リチウムイオンを吸蔵放出する周期表4~15族の元素から選ばれる少なくとも1種の元素の単体としては、例えば、ケイ素やスズ、アルミニウム、亜鉛、砒素等が挙げられる。
同じく酸化物としては、例えば、スズケイ素酸化物(SnSiO3)、リチウム酸化ビスマス(Li3BiO4)、リチウム酸化亜鉛(Li2ZnO2)、リチウム酸化チタン(Li4Ti5O12)等が挙げられる。
同じく硫化物としては、リチウム硫化鉄(LixFeS2(0≦x≦3))、リチウム硫化銅(LixCuS(0≦x≦3))等が挙げられる。
同じく窒化物としては、リチウム含有遷移金属窒化物が挙げられ、具体的には、LixMyN(M=Co、Ni、Cu、0≦x≦3、0≦y≦0.5)、リチウム鉄窒化物(Li3FeN4)等が挙げられる。
リチウムイオンを可逆的に吸蔵・放出可能な炭素材料としては、グラファイト、カーボンブラック、コークス、ガラス状炭素、炭素繊維、カーボンナノチューブ、またはこれらの焼結体等が挙げられる。
この炭素質材料としては、活性炭等が挙げられ、例えば、フェノール樹脂を炭化後、賦活処理して得られた活性炭が挙げられる。
活物質層の形成部位は、用いるデバイスのセル形態等に応じて適宜設定すればよく、アンダーコート層の表面全部でもその一部でもよいが、ラミネートセル等に使用する目的で、金属タブと電極とを超音波溶接等の溶接により接合した電極構造体として用いる場合には、溶接部を残すためアンダーコート層の表面の一部に電極スラリーを塗布して活物質層を形成することが好ましい。特に、ラミネートセル用途では、アンダーコート層の周縁を残したそれ以外の部分に電極スラリーを塗布して活物質層を形成することが好適である。
なお、バインダーポリマーの添加量は、活物質100質量部に対して、0.1~20質量部、特に、1~10質量部が好ましい。
溶媒としては、上記CNT含有組成物で例示した溶媒が挙げられ、それらの中からバインダーの種類に応じて適宜選択すればよいが、PVdF等の非水溶性のバインダーの場合はNMPが好適であり、PAA等の水溶性のバインダーの場合は水が好適である。
また、加熱乾燥する場合の温度も任意であるが、50~400℃程度が好ましく、80~150℃程度がより好ましい。
このエネルギー貯蔵デバイスは、電極として上述したエネルギー貯蔵デバイス電極を用いることにその特徴があるため、その他のデバイス構成部材であるセパレータや、電解質などは、公知の材料から適宜選択して用いることができる。
セパレータとしては、例えば、セルロース系セパレータ、ポリオレフィン系セパレータなどが挙げられる。
電解質としては、液体、固体のいずれでもよく、また水系、非水系のいずれでもよいが、本発明のエネルギー貯蔵デバイス電極は、非水系電解質を用いたデバイスに適用した場合にも実用上十分な性能を発揮させ得る。
電解質塩としては、4フッ化硼酸リチウム、6フッ化リン酸リチウム、過塩素酸リチウム、トリフルオロメタンスルホン酸リチウム等のリチウム塩;テトラメチルアンモニウムヘキサフルオロホスフェート、テトラエチルアンモニウムヘキサフルオロホスフェート、テトラプロピルアンモニウムヘキサフルオロホスフェート、メチルトリエチルアンモニウムヘキサフルオロホスフェート、テトラエチルアンモニウムテトラフルオロボレート、テトラエチルアンモニウムパークロレート等の4級アンモニウム塩、リチウムビス(トリフルオロメタンスルホニル)イミド、リチウムビス(フルオロスルホニル)イミド等のリチウムイミドなどが挙げられる。
非水系有機溶媒としては、プロピレンカーボネート、エチレンカーボネート、ブチレンカーボネート等のアルキレンカーボネート;ジメチルカーボネート、メチルエチルカーボネート、ジエチルカーボネート等のジアルキルカーボネート;アセトニトリル等のニトリル類、ジメチルホルムアミド等のアミド類などが挙げられる。
コイン型に適用する場合、上述した本発明のエネルギー貯蔵デバイス電極を、所定の円盤状に打ち抜いて用いればよい。
例えば、リチウムイオン二次電池は、コインセルのワッシャーとスペーサーが溶接されたフタに、所定形状に打ち抜いたリチウム箔を所定枚数設置し、その上に、電解液を含浸させた同形状のセパレータを重ね、さらに上から、活物質層を下にして本発明のエネルギー貯蔵デバイス電極を重ね、ケースとガスケットを載せて、コインセルかしめ機で密封して作製することができる。
この場合、電極構造体を構成する電極は一枚でも複数枚でもよいが、一般的には、正負極とも複数枚が用いられる。
正極を形成するための複数枚の電極は、負極を形成するための複数枚の電極板と、一枚ずつ交互に重ねることが好ましく、その際、正極と負極の間には上述したセパレータを介在させることが好ましい。
金属タブは、複数枚の電極の最も外側の電極の溶接部で溶接しても、複数枚の電極のうち、任意の隣接する2枚の電極の溶接部間に金属タブを挟んで溶接してもよい。
金属タブの形状は、箔状が好ましく、その厚さは0.05~1mm程度が好ましい。
超音波溶接の手法としては、例えば、複数枚の電極をアンビルとホーンとの間に配置し、溶接部に金属タブを配置して超音波をかけて一括して溶接する手法や、電極同士を先に溶接し、その後、金属タブを溶接する手法などが挙げられる。
本発明では、いずれの手法でも、金属タブと電極とが上記溶接部で溶接されるだけでなく、複数枚の電極同士も、アンダーコート層が形成され、かつ、活物質層が形成されていない部分で互いに超音波溶接されることになる。
溶接時の圧力、周波数、出力、処理時間等は、特に限定されるものではなく、用いる材料やアンダーコート層の目付量などを考慮して適宜設定すればよい。
このようにして得られたエネルギー貯蔵デバイスは、金属タブと、一枚または複数枚の電極とを備えて構成される電極構造体を少なくとも一つ有し、電極が、集電基板と、この集電基板の少なくとも一方の面に形成されたアンダーコート層と、このアンダーコート層の表面の一部に形成された活物質層とを有し、アンダーコート層が、CNTを含み、かつ、その集電基板の一面あたりの目付量が、0.1g/m2以下であり、電極が複数枚用いられている場合、それらが、アンダーコート層が形成され、かつ、活物質層が形成されていない部分で互いに超音波溶接されているとともに、電極のうちの少なくとも一枚が、アンダーコート層が形成され、かつ、活物質層が形成されていない部分で金属タブと超音波溶接されているという構成を備えたものである。
(1)プローブ型超音波照射装置(分散処理)
装置:Hielscher Ultrasonics社製 UIP1000
(2)ワイヤーバーコーター(薄膜作製)
装置:株式会社エスエムテー製 PM-9050MC
(3)超音波溶接機(超音波溶接試験)
装置:日本エマソン(株)製、2000Xea 40:0.8/40MA-XaeStand
(4)充放電測定装置(二次電池評価)
装置:北斗電工株式会社製 HJ1001SM8A
(5)マイクロメーター(バインダー、活性層の膜厚測定)
装置:株式会社ミツトヨ製 IR54
(6)ホモディスパー(電極スラリーの混合)
装置:T.K.ロボミックス(ホモディスパー2.5型(φ32)付き)(プライミクス(株)製)
(7)薄膜旋回型高速ミキサー(電極スラリーの混合)
装置:フィルミクス40型(プライミクス(株)製)
(8)自転・公転ミキサー(電極スラリーの脱泡)
装置:あわとり錬太郎(ARE-310)((株)シンキー製)
(9)ロールプレス装置(電極の圧縮)
装置:超小型卓上熱ロールプレス機 HSR-60150H(宝泉(株)製)
[比較例1-1]
分散剤として国際公開第2014/042080号の合成例2と同様の手法で合成した、下記式で示されるPTPA-PBA-SO3H0.50gを、分散媒である2-プロパノール43gおよび水6.0gに溶解させ、この溶液へMWCNT(Nanocyl社製“NC7000”外径10nm)0.50gを添加した。この混合物に、プローブ型超音波照射装置を用いて室温(およそ25℃)で30分間超音波処理を行い、沈降物がなくMWCNTが均一に分散した黒色のMWCNT含有分散液を得た。
得られたMWCNT含有分散液50gに、ポリアクリル酸(PAA)を含む水溶液であるアロンA-10H(東亞合成(株)、固形分濃度25.8質量%)3.88gと2-プロパノール46.12gとを加えて撹拌し、アンダーコート液A1を得た。
得られたアンダーコート液A1を、集電基板であるアルミ箔(厚み20μm)にワイヤーバーコーター(OSP13、ウェット膜厚13μm)で均一に展開後、120℃で20分乾燥してアンダーコート層を形成し、アンダーコート箔B1を作製した。アンダーコート箔を5×10cmに切り出したものを20枚用意し、質量を測定後、2-プロパノールと水の1:1(質量比)混合液を染み込ませた紙でアンダーコート層を擦り落とした金属箔の質量を測定し、擦り落とす前後の質量差から算出したアンダーコート層の目付量は、0.167g/m2であった。
さらに得られたアンダーコート箔B1の反対側の面にも、同様にアンダーコート液A1を塗布、乾燥することで、アルミ箔の両面にアンダーコート層が形成されたアンダーコート箔C1を作製した。
比較例1-1で作製したアンダーコート液A1を、2-プロパノールで2倍に希釈して、アンダーコート液A2を得た。
得られたアンダーコート液A2を用いた以外は、比較例1-1と同様にして、アンダーコート箔B2およびC2を作製し、アンダーコート箔B2の目付量を算出したところ、0.088g/m2であった。
比較例1-1で作製したアンダーコート液A1を、2-プロパノールで4倍に希釈して、アンダーコート液A3を得た。
得られたアンダーコート液A3を用いた以外は、比較例1-1と同様にして、アンダーコート箔B3およびC3を作製し、アンダーコート箔B3の目付量を算出したところ、0.042g/m2であった。
比較例1-1で作製したアンダーコート液A1を、2-プロパノールで6倍に希釈して、アンダーコート液A4を得た。
得られたアンダーコート液A4を用いた以外は、比較例1-1と同様にして、アンダーコート箔B4およびC4を作製し、アンダーコート箔B4の目付量を算出したところ、0.032g/m2であった。
分散剤としてオキサゾリンポリマーを含む水溶液であるエポクロスWS-700((株)日本触媒製、固形分濃度25質量%、重量平均分子量4×104、オキサゾリン基量4.5mmol/g)2.0gと、蒸留水47.5gとを混合し、さらにそこへMWCNT0.5gを混合した。得られた混合物に対して、プローブ型超音波照射装置を用いて室温で30分間超音波処理を行い、沈降物がなくMWCNTが均一に分散した黒色のMWCNT含有分散液を得た。
得られたMWCNT含有分散液50gに、ポリアクリル酸アンモニウム(PAA-NH4)を含む水溶液であるアロンA-30(東亞合成(株)、固形分濃度31.6質量%)0.7gと、アルギン酸ナトリウム(アルギン酸Na)(関東化学(株)、鹿1級)0.2gと、蒸留水49.1gとを加えて撹拌し、アンダーコート液A5を得た。
得られたアンダーコート液A5を、集電基板であるアルミ箔(厚み20μm)にワイヤーバーコーター(OSP13、ウェット膜厚13μm)で均一に展開後、120℃で20分乾燥してアンダーコート層を形成し、アンダーコート箔B5を作製した。アンダーコート箔を5×10cmに切り出したものを20枚用意し、質量を測定後、水を染み込ませた紙でアンダーコート層を擦り落とした金属箔の質量を測定し、擦り落とす前後の質量差からアンダーコート層の目付量を算出した結果、0.113g/m2であった。
さらに得られたアンダーコート箔B5の反対側の面にも、同様にアンダーコート液A5を塗布、乾燥することで、アルミ箔の両面にアンダーコート層が形成されたアンダーコート箔C5を作製した。
ワイヤーバーコーター(OSP4、ウェット膜厚4μm)を用いた以外は、比較例1-2と同様にして、アンダーコート箔B6およびC6を作製し、アンダーコート箔B6の目付量を算出したところ、0.035g/m2であった。
ワイヤーバーコーター(OSP3、ウェット膜厚3μm)を用いた以外は、比較例1-2と同様にして、アンダーコート箔B7およびC7を作製し、アンダーコート箔B7の目付量を算出したところ、0.027g/m2であった。
ワイヤーバーコーター(OSP2、ウェット膜厚2μm)を用いた以外は、比較例1-2と同様にして、アンダーコート箔B8およびC8を作製し、アンダーコート箔B8の目付量を算出したところ、0.016g/m2であった。
MWCNTの代わりにアセチレンブラック(AB、電気化学工業(株)製、デンカブラック)を用いた以外は、比較例1-1と同様にして、アンダーコート液A9、アンダーコート箔B9およびC9を作製し、アンダーコート箔B9の目付量を算出したところ、0.166g/m2であった。
MWCNTの代わりにABを用いた以外は、実施例1-1と同様にして、アンダーコート液A10、アンダーコート箔B10およびC10を作製し、アンダーコート箔B10の目付量を算出したところ、0.081g/m2であった。
MWCNTの代わりにABを用いた以外は、実施例1-2と同様にして、アンダーコート液A11、アンダーコート箔B11およびC11を作製し、アンダーコート箔B11の目付量を算出したところ、0.036g/m2であった。
MWCNTの代わりにABを用いた以外は、実施例1-3と同様にして、アンダーコート液A12、アンダーコート箔B12およびC12を作製し、アンダーコート箔B12の目付量を算出したところ、0.026g/m2であった。
MWCNTの代わりにABを用いた以外は、比較例1-2と同様にして、アンダーコート箔B13およびC13を作製し、アンダーコート箔B13の目付量を算出したところ、0.146g/m2であった。
MWCNTの代わりにABを用いた以外は、実施例1-4と同様にして、アンダーコート箔B14およびC14を作製し、アンダーコート箔B14の目付量を算出したところ、0.052g/m2であった。
MWCNTの代わりにABを用いた以外は、実施例1-5と同様にして、アンダーコート箔B15およびC15を作製し、アンダーコート箔B15の目付量を算出したところ、0.044g/m2であった。
MWCNTの代わりにABを用いた以外は、実施例1-6と同様にして、アンダーコート箔B16およびC16を作製し、アンダーコート箔B16の目付量を算出したところ、0.029g/m2であった。
実施例1-1~1-6および比較例1-1~1-10で作製した各アンダーコート箔について、下記手法により、超音波溶接試験を行った。
日本エマソン(株)の超音波溶接機(2000Xea,40:0.8/40MA-XaeStand)を用い、アンビル上のアルミタブ(宝泉(株)製、厚み0.1mm、幅5mm)の上に、両面にアンダーコート層が形成されたアンダーコート箔5枚を積層し、上からホーンを当てて超音波振動を与えて溶接した。溶接面積は3×12mmとし、溶接後、ホーンに接触したアンダーコート箔が破れることなく、タブとアンダーコート箔を剥離させようとした場合に箔が破れる場合に○、タブと箔間で剥離する場合に×とした。結果を表1に示す。
アルミ箔の代わりに銅箔(厚み15μm)を用いた以外は、比較例1-1と同様にして、アンダーコート箔C16を作製した。
アルミ箔の代わりに銅箔(厚み15μm)を用いた以外は、実施例1-1と同様にして、アンダーコート箔C17を作製した。
アルミ箔の代わりに銅箔(厚み15μm)を用いた以外は、実施例1-2と同様にして、アンダーコート箔C18を作製した。
アルミ箔の代わりに銅箔(厚み15μm)を用いた以外は、実施例1-3と同様にして、アンダーコート箔C19を作製した。
実施例1-7~1-9および比較例1-11で作製した各アンダーコート箔について、ニッケルメッキ銅タブ(宝泉(株)製、厚み0.1mm、幅5mm)を用いた以外は、上記と同様の手法により、超音波溶接試験を行った。溶接後、ホーンに接触したアンダーコート箔が破れることなく、タブとアンダーコート箔を剥離させようとした場合に箔が破れる場合に○、タブと箔間で剥離する場合に×とした。結果を表2に示す。
[比較例2-1]
活物質としてマンガン酸リチウム(LMO、(株)豊島製作所製)26.1g、バインダーとしてポリフッ化ビニリデン(PVdF)のNMP溶液(12質量%、(株)クレハ、KFポリマー L#1120)19.3g、導電助剤としてAB0.58gおよびN-メチルピロリドン(NMP)3.99gを、ホモディスパーにて3,500rpmで1分間混合した。次いで、薄膜旋回型高速ミキサーを用いて周速20m/秒で60秒の混合処理をし、さらに自転・公転ミキサーにて1000rpmで2分脱泡することで、電極スラリー(固形分濃度58質量%、LMO:PVdF:AB=90:8:2(質量比))を作製した。
得られた電極スラリーを、比較例1-1で作製した、片面にアンダーコート層を塗布したアンダーコート箔B1のアンダーコート層全面に均一(ウェット膜厚100μm)に展開後、80℃で30分、次いで120℃で30分乾燥してアンダーコート層上に活物質層を形成し、さらにロールプレス機で圧着することで、活物質層の厚み30μmの電極D1を作製した。
2032型のコインセル(宝泉(株)製)のワッシャーとスペーサーが溶接されたフタに、直径14mmに打ち抜いたリチウム箔(本荘ケミカル(株)製、厚み0.17mm)を6枚重ねたものを設置し、その上に、電解液(キシダ化学(株)製、エチレンカーボネート:ジエチルカーボネート(1:1、体積比)、電解質であるリチウムヘキサフルオロホスフェートを1mol/L含む)を24時間以上染み込ませた、直径16mmに打ち抜いたセパレータ(セルガード(株)製、2400)を一枚重ねた。さらに上から、活物質を塗布した面を下にして電極D1を重ねた。電解液を1滴滴下した後、ケースとガスケットを載せて、コインセルかしめ機で密封した。その後24時間静置し、試験用の二次電池とした。
実施例1-1で作製したアンダーコート箔B2を用いた以外は、比較例2-1と同様にして、電極D2および試験用の二次電池を作製した。
実施例1-2で作製したアンダーコート箔B3を用いた以外は、比較例2-1と同様にして、電極D3および試験用の二次電池を作製した。
実施例1-3で作製したアンダーコート箔B4を用いた以外は、比較例2-1と同様にして、電極D4および試験用の二次電池を作製した。
比較例1-2で作製したアンダーコート箔B5を用いた以外は、比較例2-1と同様にして、電極D5および試験用の二次電池を作製した。
実施例1-4で作製したアンダーコート箔B6を用いた以外は、比較例2-1と同様にして、電極D6および試験用の二次電池を作製した。
実施例1-5で作製したアンダーコート箔B7を用いた以外は、比較例2-1と同様にして、電極D7および試験用の二次電池を作製した。
実施例1-6で作製したアンダーコート箔B8を用いた以外は、比較例2-1と同様にして、電極D8および試験用の二次電池を作製した。
比較例1-3で作製したアンダーコート箔B9を用いた以外は、比較例2-1と同様にして電極D9および試験用の二次電池を作製した。
比較例1-4で作製したアンダーコート箔B10を用いた以外は、比較例2-1と同様にして、電極D10および試験用の二次電池を作製した。
比較例1-5で作製したアンダーコート箔B11を用いた以外は、比較例2-1と同様にして、電極D11および試験用の二次電池を作製した。
比較例1-6で作製したアンダーコート箔B12を用いた以外は、比較例2-1と同様にして、電極D12および試験用の二次電池を作製した。
比較例1-7で作製したアンダーコート箔B13を用いた以外は、比較例2-1と同様にして、電極D13および試験用の二次電池を作製した。
比較例1-8で作製したアンダーコート箔B14を用いた以外は、比較例2-1と同様にして、電極D14および試験用の二次電池を作製した。
比較例1-9で作製したアンダーコート箔B15を用いた以外は、比較例2-1と同様にして、電極D15および試験用の二次電池を作製した。
比較例1-10で作製したアンダーコート箔B16を用いた以外は、比較例2-1と同様にして、電極D16および試験用の二次電池を作製した。
無垢のアルミ箔を用いた以外は、比較例2-1と同様にして、電極D17および試験用の二次電池を作製した。
・電流:0.5C定電流充電、0.5C、3C、5C、10C定電流放電(LMOの容量を148mAh/gとし、5サイクルごとの放電レートを上昇させた後、最後に放電レートを0.5Cに戻した)
・カットオフ電圧:4.50V-3.00V
・温度:室温
[実施例3-1]
活物質としてマンガン酸リチウム(LMO、(株)豊島製作所製)26.1g、バインダーとしてポリフッ化ビニリデン(PVdF)のNMP溶液(12質量%、(株)クレハ、KFポリマー L#1120)19.3g、導電助剤としてAB0.58gおよびN-メチルピロリドン(NMP)3.99gを、ホモディスパーにて3,500rpmで1分混合した。次いで、薄膜旋回型高速ミキサーを用いて周速20m/秒で60秒の混合処理をし、さらに自転・公転ミキサーにて1000rpmで2分脱泡することで、電極スラリー(固形分濃度58質量%、LMO:PVdF:AB=90:8:2(質量比))を作製した。
実施例1-2で作製した、片面にアンダーコート層を塗布したアンダーコート箔B3を、短辺8cm×長辺20cmの長方形状に切り出した。その上に、上記で得られた電極スラリーを、短辺の両側1.5cmを残した中心部に5cm幅で20cmの帯状に均一に展開後、80℃で30分、次いで120℃で30分乾燥してアンダーコート層上に活物質層を形成し、さらにロールプレス機で圧着することで、活物質層の厚み30μmの電極シートを作製した。活物質の目付量は、直径10mmの円盤状に打ち抜き、質量を測定することで測定した結果、7.58mg/cm2であった。
得られた電極シートについて、活物質層が塗布された部位が4cm×5cmとなるように、かつ、上記長辺における活物質層が塗布されていない部位が1.5cm×1cmとなるように打ち抜き、正極E1とした。アンダーコート層が形成され、かつ、活物質層が形成されていない部分に、アルミタブ(幅4mm×6.5cm、厚み0.1mm、宝泉(株)製)を超音波溶接機にて溶接した。
活物質としてグラファイト(Gr、日本黒鉛工業(株)製、CGB-15)11.3g、バインダーとしてポリアクリロニトリル系バインダーの水分散液(14.9質量%、CHENGDU INDIGO POWER SOURCES CO.,LTD、LA-132)3.22g、導電助剤としてAB0.24gおよび水15.3gを、ホモディスパーにて3,500rpmで1分混合した。次いで、薄膜旋回型高速ミキサーを用いて周速20m/秒で60秒の混合処理をし、さらに自転・公転ミキサーにて1000rpmで2分脱泡することで、電極スラリー(固形分濃度40質量%、Gr:LA-132:AB=94:4:2(質量比))を作製した。
無垢の銅箔(厚み18μm)を、短辺8cm×長辺20cmの長方形状に切り出した。その上に、上記で得られた電極スラリーを、短辺の両側1.5cmを残した中心部に5cm幅で20cmの帯状に均一に展開後、80℃で30分、次いで120℃で30分乾燥してアンダーコート層上に活物質層を形成し、さらにロールプレス機で圧着することで、活物質層の厚み20μmの電極シートを作製した。活物質の目付量は、直径10mmの円盤状に打ち抜き、質量を測定することで測定した結果、3.54mg/cm2であった。
得られた電極シートについて、活物質層が塗布された部位が4.4cm×5.4cmとなるように、かつ、上記長辺における活物質層が塗布されていない部位が1.5cm×1cmとなるように打ち抜き、負極F1とした。活物質層が形成されていない部分に、ニッケルをめっきした銅タブ(幅4mm×6.5cm、厚み0.1mm、宝泉(株)製)を超音波溶接機にて溶接した。
電極塗布面を覆うように、正極E1をセパレータ(セルガード(株)製、2400)を用いて袋閉じにした後、正極E1と負極F1とを、電極塗布面が対向するように積層し、ラミネートフィルム(大日本印刷(株)製)にタブを熱圧着させて固定した。真空下、100℃で9時間乾燥後、アルゴンで満たされたグローブボックスに移した。電解液(キシダ化学(株)製、エチレンカーボネート:ジエチルカーボネート(1:1、体積比)、電解質であるリチウムヘキサフルオロホスフェートを1mol/L含む)を0.5mL注入し、0.5気圧で20分減圧浸透させた後、真空で解放部位を熱圧着させて密封することで、試験用のラミネートセルを作製した。
無垢のアルミ箔を用いた以外には、実施例3-1と同様にして正極E2、負極F2、および試験用のラミネートセルを作製した。正極および負極の目付量は、それぞれ7.35mg/cm2および3.49mg/cm2であった。
・電流:0.1C定電流充放電を2サイクル後、0.5C定電流充電、0.5C、3C、5C、10C定電流放電(LMOの容量を148mAh/gとし、3サイクルごとの放電レートを上昇させた)
・カットオフ電圧:4.50V-3.00V
・温度:室温
Claims (15)
- 集電基板と、この集電基板の少なくとも一方の面に形成されたアンダーコート層とを有し、
前記アンダーコート層が、カーボンナノチューブを含み、かつ、その前記集電基板の一面あたりの目付量が、0.1g/m2以下であることを特徴とするエネルギー貯蔵デバイス電極用アンダーコート箔。 - 前記アンダーコート層が、前記集電基板の少なくとも一方の面に、当該面全体を覆う態様で形成された請求項1記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 前記アンダーコート層が、マトリックス高分子を含む請求項1または2記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 前記アンダーコート層が、カーボンナノチューブ分散剤を含む請求項1~3のいずれか1項記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 前記カーボンナノチューブ分散剤が、トリアリールアミン系高分岐ポリマーまたは側鎖にオキサゾリン基を含むビニル系ポリマーである請求項4記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 前記目付量が、0.05g/m2未満である請求項1~5のいずれか1項記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 前記アンダーコート層の厚みが、0.01~10μmである請求項1~6のいずれか1項記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 前記集電基板が、アルミニウム箔または銅箔である請求項1~7のいずれか1項記載のエネルギー貯蔵デバイス電極用アンダーコート箔。
- 請求項1~8のいずれか1項記載のエネルギー貯蔵デバイス電極用アンダーコート箔と、そのアンダーコート層の表面の一部または全部に形成された活物質層とを有するエネルギー貯蔵デバイス電極。
- 前記活物質層が、前記アンダーコート層の表面の一部に形成された請求項9記載のエネルギー貯蔵デバイス電極。
- 前記活物質層が、前記アンダーコート層の周縁を残し、それ以外の部分全体を覆う態様で形成された請求項10記載のエネルギー貯蔵デバイス電極。
- 請求項9~11のいずれか1項記載のエネルギー貯蔵デバイス電極を備えるエネルギー貯蔵デバイス。
- 一枚または複数枚の請求項10または11記載の電極と、金属タブとを備えて構成される電極構造体を少なくとも一つ有し、
前記電極の少なくとも一枚が、前記アンダーコート層が形成され、かつ、前記活物質層が形成されていない部分で前記金属タブと超音波溶接されているエネルギー貯蔵デバイス。 - 前記金属タブが、アルミニウム、銅およびニッケルから選ばれる少なくとも1種の金属を含んで構成される請求項10記載のエネルギー貯蔵デバイス。
- 一枚または複数枚の請求項10または11記載の電極を用いたエネルギー貯蔵デバイスの製造方法であって、
前記電極の少なくとも一枚を、前記アンダーコート層が形成され、かつ、前記活物質層が形成されていない部分で金属タブと超音波溶接する工程を有するエネルギー貯蔵デバイスの製造方法。
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CN107615536A (zh) | 2018-01-19 |
JPWO2016194747A1 (ja) | 2017-09-28 |
KR102351833B1 (ko) | 2022-01-17 |
KR20180101638A (ko) | 2018-09-12 |
JP2018049847A (ja) | 2018-03-29 |
US11251435B2 (en) | 2022-02-15 |
EP3306716A1 (en) | 2018-04-11 |
EP3306716B1 (en) | 2024-09-11 |
EP3306716A4 (en) | 2019-01-23 |
TWI713944B (zh) | 2020-12-21 |
TW201717453A (zh) | 2017-05-16 |
KR20180016969A (ko) | 2018-02-20 |
JP7035496B2 (ja) | 2022-03-15 |
JP6260740B2 (ja) | 2018-01-17 |
US20180269488A1 (en) | 2018-09-20 |
TW201921791A (zh) | 2019-06-01 |
TWI649914B (zh) | 2019-02-01 |
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