WO2019188556A1 - エネルギー貯蔵デバイス用電極及びエネルギー貯蔵デバイス - Google Patents
エネルギー貯蔵デバイス用電極及びエネルギー貯蔵デバイス Download PDFInfo
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- WO2019188556A1 WO2019188556A1 PCT/JP2019/011361 JP2019011361W WO2019188556A1 WO 2019188556 A1 WO2019188556 A1 WO 2019188556A1 JP 2019011361 W JP2019011361 W JP 2019011361W WO 2019188556 A1 WO2019188556 A1 WO 2019188556A1
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to an electrode for an energy storage device and an energy storage device.
- the present invention has been made in view of the above circumstances, and can reduce the resistance at the interface between the electrode mixture layer and the current collector even when the press pressure during electrode production is small, and can store energy with good high-speed charge / discharge characteristics. It aims at providing the electrode for devices.
- the inventors of the present invention provided an undercoat in an electrode comprising a current collector, an undercoat layer, and an electrode mixture layer formed on the undercoat layer.
- an electrode having a low resistance at the interface between the electrode mixture layer and the current collector foil can be produced even when the pressing pressure during the production of the electrode is small, and the present invention has been completed.
- the present invention provides the following electrode for energy storage device and energy storage device.
- a laminate comprising a current collector, an undercoat layer containing carbon nanotubes formed on at least one surface of the current collector, and an electrode mixture layer formed on the undercoat layer is 1 kN / cm.
- An electrode for an energy storage device formed by pressing at a pressing pressure of less than 2.
- the electrode for energy storage devices of 1 whose said press pressure is 0.5 kN / cm or less.
- 3. 2.
- the electrode for energy storage devices of 3 whose said press pressure is 0 kN / cm. 5.
- An electrode comprising: a current collector; an undercoat layer containing carbon nanotubes formed on at least one surface of the current collector; and an electrode mixture layer formed on the undercoat layer, the electrode density
- An electrode for an energy storage device having a value of less than 2.1 g / cm 3 . 6). 5. The electrode for an energy storage device, wherein the electrode density is less than 2.0 g / cm 3 . 7. 6. The electrode for an energy storage device according to 6, wherein the electrode density is 1.7 g / cm 3 or less. 8). 7. The electrode for an energy storage device according to 7, wherein the electrode density is 1.3 g / cm 3 or less. 9.
- the electrode for an energy storage device according to any one of 1 to 8, wherein the basis weight of the undercoat layer per surface of the current collector is 1,000 mg / m 2 or less. 10. 9. The electrode for an energy storage device according to 9, wherein the weight per unit area of the undercoat layer is 500 mg / m 2 or less. 11. 10. The electrode for an energy storage device according to 10, wherein the weight per unit area of the undercoat layer per side of the current collector is 300 mg / m 2 or less. 12 11. The electrode for an energy storage device according to 11, wherein the weight per unit area of the undercoat layer per side of the current collector is 200 mg / m 2 or less. 13. The electrode for an energy storage device according to any one of 1 to 12, wherein the undercoat layer contains a carbon nanotube dispersant.
- An energy storage device comprising an electrode for an energy storage device according to any one of 1 to 18. 20.
- the manufacturing method of the electrode for energy storage devices containing. 21. The manufacturing method of the electrode for 20 energy storage devices whose said press pressure is 0.5 kN / cm or less. 22. The manufacturing method of the electrode for 21 energy storage devices whose said press pressure is 0.2 kN / cm or less. 23. The manufacturing method of the electrode for 22 energy storage devices whose said press pressure is 0 kN / cm.
- an energy storage device having low resistance at the interface between the electrode mixture layer and the current collector, excellent high-speed charge / discharge characteristics, and little cycle deterioration can be obtained.
- FIG. 3 is a schematic cross-sectional view of a carbon nanotube having a constricted portion that is preferably used in the present invention.
- An electrode for an energy storage device of the present invention includes a current collector, an undercoat layer containing carbon nanotubes formed on at least one surface of the current collector, and an electrode mixture layer formed on the undercoat layer And a laminate having a pressure of less than 1 kN / cm.
- the current collector those conventionally used as current collectors for electrodes for energy storage devices can be used.
- copper, aluminum, titanium, stainless steel, nickel, gold, silver and alloys thereof, carbon materials, metal oxides, conductive polymers, etc. can be used, but welding such as ultrasonic welding is applied.
- a metal foil made of copper, aluminum, titanium, stainless steel, or an alloy thereof it is preferable to use a metal foil made of copper, aluminum, titanium, stainless steel, or an alloy thereof.
- the thickness of the current collector is not particularly limited, but is preferably 1 to 100 ⁇ m in the present invention.
- the undercoat layer includes carbon nanotubes (CNT) as a conductive material.
- 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.
- CVD chemical vapor deposition
- DWCNT double-walled CNT
- MWCNT multi-layer CNTs
- SWCNT, DWCNT, and MWCNT can be used alone or in combination.
- a multilayer CNT having a diameter of 2 nm or more is particularly preferable, and from the viewpoint that a thin film can be formed, a multilayer CNT having a diameter of 500 nm or less is particularly preferable, a multilayer CNT having a diameter of 100 nm or less is more preferable, and a multilayer having a diameter of 50 nm or less is preferable.
- CNT is even more preferable, and multilayer CNT having a diameter of 30 nm or less is most preferable.
- the diameter of CNT can be measured by observing the thin film obtained by drying what disperse
- the CNT it is preferable to use a CNT that is easy to disperse in the dispersion in order to exert an effect of reducing the battery resistance when the dispersion is used as an undercoat layer.
- Such CNTs preferably have many crystal discontinuities that can be easily cut with small energy.
- the CNT used in the present invention preferably has a constricted portion.
- the CNT having a constricted portion is a CNT wall having a constricted portion having a tube outer diameter of 90% or less of the parallel portion and the tube outer diameter of the parallel portion. Since this constricted part is a part created by changing the growth direction of CNTs, it has a discontinuous crystal part and becomes an easily breakable part that can be easily cut with a small mechanical energy.
- FIG. 1 shows a schematic cross-sectional view of a CNT having a parallel portion 1 and a constricted portion 3.
- the parallel portion 1 is a portion where the wall can be recognized as two parallel straight lines or two parallel curves.
- the distance between the outer walls of the parallel line in the normal direction is the tube outer diameter 2 of the parallel part 1.
- the constricted portion 3 is a portion where both ends thereof are connected to the parallel portion 1 and the distance between the walls is closer than that of the parallel portion 1. More specifically, the constricted portion 3 has a tube outer diameter 2 of the parallel portion 1.
- it is a portion having a tube outer diameter 4 of 90% or less.
- the tube outer diameter 4 of the constricted portion 3 is the distance between the outer walls of the constricted portion 3 where the wall constituting the outer wall is closest.
- many of the constricted portions 3 have portions where crystals are discontinuous.
- the shape of the CNT wall and the outer diameter of the tube can be observed with a transmission electron microscope or the like. Specifically, it is possible to prepare a 0.5% dispersion of CNT, dry the dispersion on a sample stage, and confirm the constricted portion by an image taken at 50,000 times with a transmission electron microscope. it can.
- CNTs For the CNTs, a 0.1% dispersion of CNTs was prepared, the dispersion was placed on a sample stage and dried, and an image taken at 20,000 times with a transmission electron microscope was divided into 100 nm square sections. When 300 sections with CNT occupying 10% to 80% in all four sections are selected, the total number of easily breakable portions depends on the ratio of the section with at least one constricted portion in one section to 300 sections. The ratio (the ratio of the presence of easily breakable parts) is determined. When the area occupied by CNTs in the compartment is less than 10%, measurement is difficult because the amount of CNTs is too small.
- the proportion of easily breakable portions is 60% or more.
- the proportion of easily breakable portions is less than 60%, CNT is difficult to disperse, and when excessive mechanical energy is applied to disperse, it leads to the destruction of the crystal structure of the graphite surface, which is a characteristic of CNT. Characteristics such as electrical conductivity are reduced.
- the presence ratio of easily breakable portions is preferably 70% or more.
- CNTs usable in the present invention include TC-2010, TC-2020, TC-, which are CNTs having a constricted structure disclosed in International Publication Nos. 2016/076393 and JP-A-2017-206413.
- TC series such as 3210L and TC-1210LN (manufactured by Toda Kogyo Co., Ltd.), spar-growth CNT (manufactured by National Research and Development Corporation, Shinshin Energy and Industrial Technology Development Organization), eDIPS-CNT (national research and development corporation, Shinshin Energy and Industry) SWNT series (product name: Meijo Nanocarbon Co., Ltd .: product name), VGCF series (product name: Showa Denko KK: product name), FloTube series (product name: CNano Technology), AMC ( Ube Industries, Ltd.
- GTH manufactured by Arkema: trade name
- MWNT7 manufactured by Hodogaya Chemical Co., Ltd .: trade name
- Hyperion CNT manufactured by Hypeprion Catalysis International: trade name
- the undercoat layer is preferably produced using a CNT-containing composition (dispersion) containing the CNTs described above and a solvent.
- the solvent is not particularly limited as long as it is conventionally used for the preparation of a conductive composition.
- ethers such as tetrahydrofuran (THF), diethyl ether, 1,2-dimethoxyethane (DME); Halogenated hydrocarbons such as methylene chloride, chloroform, 1,2-dichloroethane; N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP), etc.
- ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone
- alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, tert-butanol; n-heptane, n-hexane, cyclohexane, etc.
- Aliphatic hydrocarbons such as ruene, xylene and ethylbenzene
- Aromatic hydrocarbons such as ruene, xylene and ethylbenzene
- glycol ethers such as ethylene glycol monoethyl ether, ethylene glycol monobutyl ether and propylene glycol monomethyl ether
- organic solvents such as glycols such as ethylene glycol and propylene glycol . These solvent can be used individually by 1 type or in mixture of 2 or more types.
- water, NMP, DMF, THF, methanol, ethanol, n-propanol, isopropanol, n-butanol, and tert-butanol are preferable because the ratio of isolated dispersion of CNT can be improved.
- water is included from the point that cost can be reduced.
- These solvents can be used singly or in combination of two or more for the purpose of increasing the ratio of isolated dispersion, increasing the coatability, and reducing the cost.
- the CNT-containing composition may contain a matrix polymer as necessary.
- Matrix polymers include polyvinylidene fluoride (PVDF), polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene fluoride-hexafluoropropylene copolymer (P (VDF-HFP)), and fluoride.
- Fluorine resins such as vinylidene-chlorotrifluoroethylene copolymer (P (VDF-CTFE)); polyvinylpyrrolidone, ethylene-propylene-diene terpolymer, polyethylene (PE), polypropylene (PP), ethylene- Polyolefin resins such as vinyl acetate copolymer (EVA) and EEA (ethylene-ethyl acrylate copolymer); polystyrene (PS), high impact polystyrene (HIPS), acrylonitrile-styrene copolymer (AS), acrylonitrile- Butadiene Polystyrene resins such as Tylene Copolymer (ABS), Methyl Methacrylate-Styrene Copolymer (MS), Styrene-Butadiene Rubber; Polycarbonate Resin; Vinyl Chloride Resin; Polyamide Resin; Polyimide Resin; Sodium Polyacrylate, Polymethyl (Meth) acrylic resins
- the matrix polymer can also be obtained as a commercial product.
- Aron A-10H polyacrylic acid, manufactured by Toagosei Co., Ltd., solid content concentration 26 mass%, aqueous solution
- Aron A-30 polyacrylic acid
- Ammonium manufactured by Toagosei Co., Ltd., solid concentration 32% by mass, aqueous solution
- sodium polyacrylate manufactured by Wako Pure Chemical Industries, Ltd., degree of polymerization 2,700-7,500
- sodium carboxymethylcellulose (Wako Pure) Yakuhin Kogyo Co., Ltd.), sodium alginate (manufactured by Kanto Chemical Co., Ltd., deer grade 1)
- Metroles registered trademark
- SH series hydroxypropylmethylcellulose, manufactured by Shin-Etsu Chemical Co., Ltd.
- Metroses SE series hydroxyethyl) Methyl cellulose, manufactured by Shin-Etsu Chemical Co., Ltd.
- JC-25 completely saponified poly
- the content of the matrix polymer is not particularly limited, but is preferably about 0.0001 to 99% by mass, more preferably about 0.001 to 90% by mass in the composition.
- the CNT-containing composition may contain a dispersant in order to enhance the dispersibility of CNTs in the composition.
- a dispersant for example, carboxymethylcellulose (CMC), polyvinylpyrrolidone (PVP), an acrylic resin emulsion, a water-soluble acrylic polymer, a styrene emulsion, silicone Emulsions, acrylic silicone emulsions, fluororesin emulsions, EVA emulsions, vinyl acetate emulsions, vinyl chloride emulsions, urethane resin emulsions, triarylamine-based hyperbranched polymers described in WO2014 / 04280, described in WO2015 / 029949 And vinyl polymers having an oxazoline group in the side chain.
- a dispersant containing a polymer having an oxazoline group in the side chain described in International Publication No. 2015/029949 or a dispersant containing a triarylamine-based highly branched polymer described in International Publication No. 2014/04280 is used. It is preferable.
- an oxazoline monomer having a polymerizable carbon-carbon double bond-containing group at the 2-position as represented by the formula (1) is radically polymerized.
- a vinyl polymer having a repeating unit bonded to the polymer main chain or spacer group at the 2-position of the oxazoline ring and having an oxazoline group in the side chain is preferred.
- X is a polymerizable carbon-carbon double bond-containing group
- R 1 to R 4 are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 5 carbon atoms, An aryl group having 6 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms.
- 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 is a chain hydrocarbon group containing a polymerizable carbon-carbon double bond.
- an alkenyl group having 2 to 8 carbon atoms such as a vinyl group, an allyl group, and an isopropenyl group is preferable.
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- the alkyl group having 1 to 5 carbon atoms may be linear, branched or cyclic, for example, methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, sec-butyl group. Tert-butyl group, n-pentyl group, cyclohexyl group and the like.
- aryl group having 6 to 20 carbon atoms include phenyl group, xylyl group, tolyl group, biphenylyl group, naphthyl group and the like.
- aralkyl group having 7 to 20 carbon atoms examples 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 (1) include 2-vinyl-2-oxazoline and 2-vinyl-4-methyl-2-oxazoline.
- the oxazoline polymer is also preferably water-soluble.
- a water-soluble oxazoline polymer may be a homopolymer of the oxazoline monomer represented by the formula (1).
- the oxazoline polymer has a (meth) It is preferable that it is obtained by radical polymerization of at least two monomers with an acrylate monomer.
- the (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, Examples include ammonium (meth) acrylate, (meth) acrylonitrile, (meth) acrylamide, N-methylol (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, sodium styrenesulfonate, and the like. 1 type Be used in, it may be used in combination of two or more. Among these, methoxypolyethylene glycol (meth) acryl
- monomers other than the oxazoline monomer and the (meth) acrylic monomer having a hydrophilic functional group can be used in combination as long as the CNT dispersing ability of the oxazoline polymer is not adversely affected.
- specific examples of other monomers include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, stearyl (meth) acrylate, (meth) acrylic.
- (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 ⁇ -methylstyrene; 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. Or even in combination of two or more There.
- 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 increasing the CNT dispersibility of the obtained oxazoline polymer. Preferably, 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 improving 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 in a range that does not affect the CNT dispersibility of the obtained oxazoline polymer. 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 weight average molecular weight is a polystyrene conversion value determined by gel permeation chromatography.
- the oxazoline polymer that can be used in the present invention can be synthesized by the 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 (registered trademark) ) WS-300 (manufactured by Nippon Shokubai Co., Ltd., solid concentration 10 mass%, aqueous solution), Epocross WS-700 (manufactured by Nippon Shokubai Co., Ltd., solid content concentration 25 mass%, aqueous solution), Epocross WS-500 (( Manufactured by Nippon Shokubai Co., Ltd., solid content: 39% by mass, water / 1-methoxy-2-propanol solution), Poly (2-ethyl-2-oxazoline) (Aldrich), Poly (2-ethyl-2-oxazoline) ) (Manufactured by Alfa Aesar), Poly (2-ethyl-2-
- Ar 1 to Ar 3 are each independently any divalent organic group represented by the formulas (4) to (8).
- 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 formulas (9) to (9) (12) is any monovalent organic group (wherein Z 1 and Z 2 do not simultaneously become the alkyl group), but Z 1 and Z 2 are each independently , A hydrogen atom, a 2- or 3-thienyl group, and a group represented by the formula (9) are preferable, and in particular, one of Z 1 and Z 2 is a hydrogen atom, and the other is a hydrogen atom, 2- or 3 -More preferred is a thienyl group, a group represented by the formula (9), particularly those in which R 141 is a phenyl group, or R 141 is a methoxy group.
- R 141 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 101 to R 138 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 1 to 5 carbon atoms. Or an carboxy group, a sulfo group, a phosphoric acid group, a phosphonic acid group, or a salt thereof.
- examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- 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.
- alkali metal salts such as sodium and potassium
- Group 2 metal salts such as magnesium and calcium
- ammonium salts propylamine, dimethylamine, triethylamine, ethylenediamine, etc.
- R 139 to R 162 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 1 to 5 carbon atoms.
- a haloalkyl group, phenyl group, —OR 163 , —COR 163 , —NR 163 R 164 , —COOR 165 (wherein R 163 and R 164 are each independently A hydrogen 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 165 is carbon An alkyl group that may have a branched structure of 1 to 5 carbon atoms, a haloalkyl group that may have a branched structure of 1 to 5 carbon atoms, or a phenyl group), or a carboxy group, a sulfo group, It is a phosphoric acid group, a phosphonic acid group or a salt thereof.
- 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, and 1,1.
- examples of the alkyl group which may have a halogen atom and a branched structure having 1 to 5 carbon atoms include the same groups as those exemplified in the formulas (3) to (8).
- the hyperbranched polymer has a carboxy group in at least one aromatic ring of the repeating unit represented by the formula (2) or (3), 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 in 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-dimethyloctyl aldehyde, cyclohexane carboxaldehyde, 3-methyl-2-butyraldehyde, glyoxal, malonaldehyde, succinaldehyde, glutaraldehyde, adipine aldehyde; acrolein, methacrolein Unsaturated fatty aldehydes such as: furfural, pyridine al
- 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 hyperbranched polymer used in the present invention is, for example, a triarylamine compound that can give the above-described triarylamine skeleton as represented by the following formula (A), for example, It is obtained by condensation polymerization of an aldehyde compound and / or a ketone compound represented by the formula (B) in the presence of an acid catalyst.
- a bifunctional compound (C) such as phthalaldehyde such as terephthalaldehyde is used as the aldehyde compound, not only the reaction shown in Scheme 1 but also the reaction shown in Scheme 2 below occurs.
- a hyperbranched polymer having a crosslinked structure in which two functional groups contribute to the condensation reaction may be obtained.
- an aldehyde compound and / or a ketone compound can be used at a ratio of 0.1 to 10 equivalents per 1 equivalent of the aryl group of the triarylamine compound.
- the acid catalyst examples include mineral acids such as sulfuric acid, phosphoric acid and perchloric acid; organic sulfonic acids such as p-toluenesulfonic acid and p-toluenesulfonic acid monohydrate; carboxylic acids such as formic acid and oxalic acid. Etc. can be used.
- the amount of the acid catalyst to be used is variously selected depending on the kind thereof, but is usually 0.001 to 10,000 parts by mass, preferably 0.01 to 1,000 parts by mass with respect to 100 parts by mass of the triarylamines. More preferably, the content is 0.1 to 100 parts by mass.
- the condensation reaction can be performed without a solvent, but is usually performed using a solvent. Any solvent that does not inhibit the reaction can be used. Examples thereof include cyclic ethers such as tetrahydrofuran and 1,4-dioxane; N, N-dimethylformamide (DMF), N, N-dimethylacetamide ( DMAc), amides such as N-methyl-2-pyrrolidone (NMP); ketones such as methyl isobutyl ketone and cyclohexanone; halogenated hydrocarbons such as methylene chloride, chloroform, 1,2-dichloroethane and chlorobenzene; benzene, Examples thereof include aromatic hydrocarbons such as toluene and xylene, and cyclic ethers are particularly preferable. These solvents can be used singly or in combination of two or more. In addition, if the acid catalyst used is a liquid such as formic acid, the acid catalyst can also serve as a solvent.
- the reaction temperature during the condensation is usually 40 to 200 ° C.
- the reaction time is variously selected depending on the reaction temperature, but is usually about 30 minutes to 50 hours.
- the obtained hyperbranched polymer may be introduced by a method of treating with a reagent capable of introducing an acidic group on the aromatic ring, but the latter method may be used in consideration of the ease of production. preferable.
- the method for introducing the acidic group onto the aromatic ring is not particularly limited, and may be appropriately selected from conventionally known various methods depending on the type of the acidic group. For example, when a sulfo group is introduced, a method of sulfonation using an excessive amount of sulfuric acid can be used.
- 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, more preferably 2,000 to 1,000,000.
- hyperbranched polymer examples include, but are not limited to, those represented by the following formula.
- the mixing ratio of CNT and dispersant can be about 1,000: 1 to 1: 100 in terms of mass ratio.
- the concentration of the dispersant is not particularly limited as long as CNT can be dispersed in a solvent, but is preferably about 0.001 to 30% by mass in the composition, and about 0.002 to 20% by mass. It is more preferable.
- the concentration of CNT varies depending on the weight per unit area of the desired undercoat layer and the required mechanical, electrical, and thermal characteristics, and at least a part of CNT is isolated and dispersed. As long as the undercoat layer can be produced with a small basis weight, it is optional, but is preferably about 0.0001 to 30% by mass, more preferably about 0.001 to 20% by mass in the composition. More preferably, it is about 0.001 to 10% by mass.
- the CNT-containing composition 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.
- a cross-linking agent for an oxazoline polymer for example, a compound having two or more functional groups having reactivity with an oxazoline group such as a carboxy group, a hydroxy group, a thiol group, an amino group, a sulfinic acid group, and an epoxy group is particularly preferable. Although it does not limit, the compound which has 2 or more of carboxy groups is preferable.
- a compound having a functional group that causes a crosslinking reaction by heating during the formation of a thin film 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.
- compounds that cause 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.
- 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.
- examples thereof include ammonium salts of the above synthetic polymers and natural polymers that exhibit crosslinking reactivity upon heating.
- sodium polyacrylate, lithium polyacrylate, ammonium polyacrylate, sodium carboxymethylcellulose, lithium carboxymethylcellulose, carboxymethylcellulose ammonium and the like that exhibit crosslinking reactivity in the presence of an acid catalyst or under heating conditions are preferred.
- 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: 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 (polyammonium acrylate, Toagosei Co., Ltd.) ), Solid concentration 32% by mass, aqueous solution), DN-800H (carboxymethylcellulose ammonium, manufactured by Daicel Finechem Co., Ltd.), ammonium alginate (manufactured by Kimika Co., Ltd.), and the like.
- crosslinking agent for the triarylamine-based hyperbranched polymer examples include melamine-based, substituted urea-based, and these polymer-based crosslinking agents. These crosslinking agents can be used alone or in combination of two or more. Preferably, it is a cross-linking agent having at least two cross-linking substituents, specifically, CYMEL (registered trademark), methoxymethylated glycoluril, butoxymethylated glycoluril, methylolated glycoluril, methoxymethyl.
- CYMEL registered trademark
- crosslinking agent examples include, for example, an aldehyde group for an hydroxy group, an epoxy group, a vinyl group, an isocyanate group or an alkoxy group, an aldehyde group for a carboxy group, an amino group, an isocyanate group or an epoxy group, an isocyanate group or an aldehyde for an amino group.
- crosslinkable functional groups that react with each other in the same molecule, such as groups, hydroxy groups that react with the same crosslinkable functional groups (dehydration condensation), mercapto groups (disulfide bonds), ester groups (Claisen) (Condensation), silanol group (dehydration condensation), vinyl group, acryl group and the like.
- Specific examples of the crosslinking agent that self-crosslinks include at least one of a polyfunctional acrylate, a tetraalkoxysilane, a monomer having a blocked isocyanate group, a hydroxy group, a carboxylic acid, and an amino group that exhibit crosslinking reactivity in the presence of an acid catalyst.
- Such a self-crosslinking cross-linking agent can also be obtained as a commercial product, and as such a commercial product, for example, polyfunctional acrylate, A-9300 (ethoxylated isocyanuric acid triacrylate, Shin-Nakamura Chemical Co., Ltd. ( A-GLY-9E (Ethoxylated glycerine triacrylate (EO 9 mol), Shin-Nakamura Chemical Co., Ltd.), A-TMMT (pentaerythritol tetraacrylate, Shin-Nakamura Chemical Co., Ltd.), etc.
- tetraalkoxysilane examples include tetramethoxysilane (manufactured by Tokyo Chemical Industry Co., Ltd.), tetraethoxysilane (manufactured by Toyoko Chemical Co., Ltd.), etc., and polymers having a blocked isocyanate group include Elastolon (registered trademark) series. E-37, H-3, H38, BAP, NEW BAP-15, C-52, F-29, W-11P, MF-9, MF-25K (Daiichi Kogyo Seiyaku Co., Ltd.) .
- 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 with respect to the dispersant, preferably 0.00.
- 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 due to 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 these cross-linkable substituents. Is promoted.
- p-toluenesulfonic acid as 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 is not particularly limited.
- the CNT-containing composition can be prepared by mixing CNT, a solvent, and a dispersant, a matrix polymer, and a cross-linking agent that are used as necessary.
- 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, or the like, and ultrasonic treatment using a bath type or probe type sonicator. Of these, wet processing and ultrasonic processing using a jet mill are preferred.
- the time for the dispersion treatment is arbitrary, but is preferably about 1 minute to 10 hours, 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 CNT-containing composition can be applied to at least one surface of the current collector, and this can be naturally or heat dried to form an undercoat layer to produce an undercoat foil (composite current collector).
- the thickness of the undercoat layer is preferably from 1 nm to 10 ⁇ m, more preferably from 1 nm to 1 ⁇ m, and even more preferably from 1 to 500 nm in consideration of reducing the internal resistance of the resulting device.
- the thickness of the undercoat layer is, for example, by cutting out a test piece of an appropriate size from the undercoat foil, exposing the cross section by a method such as tearing it by hand, and by microscopic observation such as a scanning electron microscope (SEM), It can obtain
- Basis weight of the undercoat layer per one surface of the current collector is not particularly limited as long as it satisfies the thickness is preferably 1,000 mg / m 2 or less, more preferably 500mg / m 2, 300mg / m 2 or less Is more preferable, and 200 mg / m 2 or less is still more preferable.
- the basis weight of the undercoat layer per side of the current collector is preferably 1 mg / m 2 or more, more preferably 5 mg / m 2. m 2 or more, more preferably 10 mg / m 2 or more, and further preferably 15 mg / m 2 or more.
- the basis weight of the undercoat layer in the present invention is a ratio of the mass (mg) of the undercoat layer to the area (m 2 ) of the undercoat layer.
- the area is The area of only the undercoat layer does not include the area of the current collector exposed between the undercoat layers formed in a pattern.
- the mass of the undercoat layer for example, a test piece of an appropriate size was cut out from the undercoat foil, and its mass W 0 was measured. Thereafter, the undercoat layer was peeled off from the undercoat foil, and the undercoat layer was peeled off. The subsequent mass W 1 is measured and calculated from the difference (W 0 -W 1 ), or the mass W 2 of the current collector is measured in advance, and then the mass of the undercoat foil on which the undercoat layer is formed W 3 can be measured and calculated from the difference (W 3 ⁇ W 2 ).
- Examples of the method of peeling 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.
- a coating method of the CNT-containing composition for example, a spin coating method, a dip coating method, a flow coating method, an ink jet method, a casting method, a spray coating method, a bar coating method, a gravure coating method, a slit coating method, a roll coating method
- a flexographic printing method for example, a transfer printing method, a brush coating method, a blade coating method, and an air knife coating method.
- the inkjet method, casting method, dip coating method, bar coating method, blade coating method, roll coating method, gravure coating method, flexographic printing method, and spray coating method are preferable from the viewpoint of work efficiency and the like.
- the temperature for heating and drying is arbitrary, but is preferably about 50 to 200 ° C, more preferably about 80 to 150 ° C.
- the electrode mixture layer can be formed by applying an electrode slurry containing an active material, a binder polymer and, if necessary, a solvent on the undercoat layer and naturally or by heating and drying.
- the active material various active materials conventionally used for electrodes for energy storage devices 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 .
- lithium ion-containing chalcogen compound examples 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 , Mn, Ti, Cr, V, Al, Sn, Pb, and Zn, at least one metal element selected from 0.05 ⁇ x ⁇ 1.10, 0.5 ⁇ y ⁇ 1.0) Etc.
- Examples of the polyanionic compound include lithium iron phosphate (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.
- alkali metal examples include Li, Na, K, and the like
- alkali metal alloy examples include Li—Al, Li—Mg, Li—Al—Ni, Na—Hg, Na—Zn, and the like.
- 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 ), lithium titanium oxide (Li 4 Ti 5 O 12 ), and oxidation.
- examples include titanium.
- 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)).
- Examples of 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 binder polymer can be appropriately selected from known materials and used, for example, PVDF, polyvinylpyrrolidone, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, P (VDF-HFP), P ( VDF-CTFE), polyvinyl alcohol, polyimide, ethylene-propylene-diene terpolymer, styrene-butadiene rubber, CMC, polyacrylic acid (PAA), polyaniline, and other conductive polymers.
- PVDF polyvinylpyrrolidone
- polytetrafluoroethylene polytetrafluoroethylene-hexafluoropropylene copolymer
- P (VDF-HFP) P
- VDF-CTFE VDF-CTFE
- polyvinyl alcohol polyimide
- ethylene-propylene-diene terpolymer ethylene-propylene-diene terpolymer
- the addition 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 examples include the solvents exemplified in the CNT-containing composition, and may be appropriately selected according to the type of the binder.
- NMP is suitable for a water-insoluble binder such as PVDF.
- a water-soluble binder such as PAA, water is preferred.
- the electrode slurry may contain a conductive material.
- the conductive material include carbon black, ketjen black, acetylene black, carbon whisker, carbon fiber, natural graphite, artificial graphite, titanium oxide, ruthenium oxide, aluminum, nickel and the like.
- the temperature for drying by heating is arbitrary, but is preferably about 50 to 400 ° C, more preferably about 80 to 150 ° C.
- the formation part of the electrode mixture 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.
- an electrode mixture layer may be formed by applying electrode slurry to a part of the surface of the undercoat layer in order to leave a weld. preferable.
- the thickness of the electrode mixture layer is preferably 10 to 500 ⁇ m, more preferably 10 to 300 ⁇ m, and even more preferably 20 to 100 ⁇ m in consideration of the balance between the capacity and resistance of the battery.
- the electrode of this invention can be manufactured by pressing the laminated body provided with an electrical power collector, an undercoat layer, and an electrode compound-material layer with the press pressure of less than 1 kN / cm.
- the pressing method a generally adopted method can be used, but a die pressing method and a roll pressing method are particularly preferable.
- the pressing pressure is not particularly limited as long as it is less than 1 kN / cm.
- the pressing pressure may be 0.5 kN / cm or less, may be 0.2 kN / cm or less, and the pressing pressure is 0 kN / cm. Even so (ie, without pressing), the electrode of the present invention can be produced.
- Energy storage device electrode of the present invention is the electrode density is less than 2.1 g / cm 3, more that is preferably less than 2.0 g / cm 3, is 1.7 g / cm 3 or less Preferably, it is 1.3 g / cm 3 or less.
- the minimum of the said electrode density is not specifically limited, Usually, it is 0.5 g / cm ⁇ 3 > or more, and it is preferable that it is 0.8 g / cm ⁇ 3 > or more.
- the energy storage device of the present invention includes the above-described electrode for energy storage device, 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 above-described electrode for an energy storage device.
- Examples of the energy storage device of the present invention include various energy storage devices such as a lithium ion secondary battery, a hybrid capacitor, a lithium secondary battery, a nickel hydride battery, and a lead storage battery.
- this energy storage device is characterized by the use of the above-mentioned electrode for energy storage device as an electrode, other device constituent members such as separators and electrolytes may be appropriately selected from known materials and used. it can.
- the separator examples include a cellulose separator and a polyolefin separator.
- the electrolyte may be either liquid or solid, and may be either aqueous or non-aqueous.
- the electrode for an energy storage device of the present invention is practically sufficient even when applied to a device using a non-aqueous electrolyte. Performance 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 Quaternary ammonium salts such as hexafluorophosphate, 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 it is possible to adopt various types of cells known in the art such as a cylindrical type, a flat wound rectangular type, a laminated square type, a coin type, a flat wound laminated type, and a laminated laminated type. it can.
- the above-described electrode for an energy storage device of the present invention may be used by punching it into a predetermined disk shape.
- 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.
- the electrode for energy storage device of the present invention can be overlapped with the electrode mixture layer facing down, and a case and a gasket can be placed thereon, and sealed with a coin cell caulking machine.
- the electrode coating layer is formed on the entire surface of the undercoat layer or on the entire surface, and the portion where the undercoat layer is formed and the electrode mixture layer is not formed (welding).
- the electrode structure obtained by welding with the metal tab in (Part) 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 electrodes for forming the negative electrode, and in this case, the separator described above is interposed between the positive electrode and the negative electrode. It is preferable.
- the basis weight of the undercoat layer per surface of the current collector is preferably 100 mg / m 2 or less, more preferably Is 90 mg / m 2 or less, more preferably less than 50 mg / m 2 .
- 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. For example, metal such as nickel, aluminum, titanium, copper, etc .; stainless steel, nickel alloy, aluminum alloy, titanium alloy And alloys such as copper alloys. Among these, in consideration of welding efficiency, those including at least one metal selected from aluminum, copper and nickel are 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, ultrasonic welding, and the like. It is preferable to join the metal tab.
- a method of ultrasonic welding for example, a method in which 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, and electrodes are bonded together. Examples include a method of welding first and then welding a metal tab.
- the metal tab and the electrode are welded at the welded portion, but also a plurality of electrodes are ultrasonically welded to each other.
- 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 used, the basis weight of the undercoat layer, and the like.
- the electrode structure produced as described above is accommodated in a laminate pack, and after injecting the above-described electrolyte solution, heat sealing is performed to obtain a laminate cell.
- Thin-film swivel type high-speed mixer Primics Co., Ltd., Filmics 40 type ⁇ Rotation / revolution mixer: Sinky Co., Ltd., Aritori Neritaro (ARE-310) ⁇ Roll press equipment: Takumi Giken, SA-602 ⁇ Charge / discharge measurement device: TOSCAT-3100, manufactured by Toyo System Co., Ltd. -Adhesion / film peeling analyzer: VERSATILE PEEL ANALYZER VPA-3, manufactured by Kyowa Interface Science Co., Ltd.
- Epocross WS-300 which is an aqueous solution containing an oxazoline polymer (made by Nippon Shokubai Co., Ltd., solid content concentration 10 mass%, weight average molecular weight 1.2 ⁇ 10 5 , oxazoline group amount 7.7 mmol / g) 5.0 g, 37.15 g of pure water and 7.35 g of 2-propanol (manufactured by Junsei Kagaku Co., Ltd., reagent grade) are mixed, and CNT (made by Toda Kogyo Co., Ltd., TC-2010), which is a conductive carbon material, is further mixed there. ) 0.5 g was mixed.
- oxazoline polymer made by Nippon Shokubai Co., Ltd., solid content concentration 10 mass%, weight average molecular weight 1.2 ⁇ 10 5 , oxazoline group amount 7.7 mmol / g
- 2-propanol manufactured by Junsei Kagaku Co
- the obtained mixture was subjected to ultrasonic treatment for 30 minutes using a probe type ultrasonic irradiation device to prepare a dispersion in which CNTs were uniformly dispersed.
- a probe type ultrasonic irradiation device to prepare a dispersion in which CNTs were uniformly dispersed.
- Aron A-30 manufactured by Toagosei Co., Ltd., solid content concentration 31.6% by mass
- an aqueous solution containing ammonium polyacrylate 41.35 g of pure water
- 2-propanol (genuine) Undercoat composition A was prepared by mixing 7.44 g of a reagent grade manufactured by Chemical Co., Ltd.
- the obtained undercoat composition A was uniformly spread on a current collector aluminum foil (thickness 15 ⁇ m) with a wire bar coater (OSP-13, wet film thickness 13 ⁇ m), and then dried at 150 ° C. for 30 minutes to undercoat.
- a coat layer was formed to prepare an undercoat foil A. As a result of measuring the basis weight, it was 150 mg / m 2 .
- Undercoat foil C was prepared in the same manner as in Production Example 1, except that Denka Black (Carbon Black, manufactured by Denka Co., Ltd.) was used instead of CNT. As a result of measuring the basis weight, it was 129 mg / m 2 .
- Denka Black Carbon Black, manufactured by Denka Co., Ltd.
- Example 1 Production of electrode and lithium ion secondary battery
- 13.05 g of NMP solution of polyvinylidene fluoride (PVDF) as a binder 12% by mass, manufactured by Kureha Corporation, KF polymer L # 1120
- Denka black 1.39 g and NMP 13.72 g as a conductive material were mixed with a homodisper at 8,000 rpm for 1 minute.
- PVDF polyvinylidene fluoride
- the obtained electrode slurry is spread uniformly on the undercoat foil A (wet film thickness 100 ⁇ m), and then dried at 80 ° C. for 30 minutes and then at 120 ° C. for 30 minutes to form an electrode mixture layer on the undercoat layer. Furthermore, it was pressed and pressed by a roll press machine at a press pressure of 0.2 kN / cm to produce an electrode.
- Electrodes having a diameter of 10 mm are punched from the obtained electrode, and the mass of the electrode layer (the mass of the punched electrode minus the mass of the punched electrode uncoated portion having a diameter of 10 mm) and the electrode layer
- the electrode density was calculated from the thickness (thickness of the punched electrode minus the thickness of the substrate).
- the electrode density was 1.63 g / cm 3 .
- Each electrode was vacuum dried at 120 ° C. for 15 hours and transferred to a glove box filled with argon.
- a 2032 type coin cell manufactured by Hosen Co., Ltd.
- 6 sheets of lithium foil Honjo Chemical Co., Ltd., thickness 0.17 mm
- a separator (Celguard # 2400, manufactured by Celgard Co., Ltd.) punched to a diameter of 16 mm was stacked.
- the electrodes were stacked from the top with the surface coated with the active material facing down. After dropping one drop of the electrolyte, a case and a gasket were placed and sealed with a coin cell caulking machine. Then, it was left to stand for 24 hours, and four lithium ion secondary batteries A1 for testing were produced.
- Example 2 Four lithium ion secondary batteries A2 for testing were produced in the same manner as in Example 1 except that they were not crimped by a roll press (pressing pressure 0 kN / cm). The electrode density was 1.27 g / cm 3 .
- Example 1 Four test lithium ion secondary batteries B1 were produced in the same manner as in Example 1 except that solid aluminum foil was used instead of the undercoat foil A.
- the electrode density was 1.64 g / cm 3 .
- Example 2 Four test lithium ion secondary batteries B2 were produced in the same manner as in Example 2 except that solid aluminum foil was used instead of the undercoat foil A.
- the electrode density was 1.26 g / cm 3 .
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Abstract
Description
1.集電体と、該集電体の少なくとも一方の面に形成されたカーボンナノチューブを含むアンダーコート層と、該アンダーコート層上に形成された電極合材層とを備える積層体を、1kN/cm未満のプレス圧力でプレスしてなるエネルギー貯蔵デバイス用電極。
2.前記プレス圧力が、0.5kN/cm以下である1のエネルギー貯蔵デバイス用電極。
3.前記プレス圧力が、0.2kN/cm以下である2のエネルギー貯蔵デバイス用電極。
4.前記プレス圧力が、0kN/cmである3のエネルギー貯蔵デバイス用電極。
5.集電体と、該集電体の少なくとも一方の面に形成されたカーボンナノチューブを含むアンダーコート層と、該アンダーコート層上に形成された電極合材層とを備える電極であって、電極密度が2.1g/cm3未満であるエネルギー貯蔵デバイス用電極。
6.前記電極密度が、2.0g/cm3未満である5のエネルギー貯蔵デバイス用電極。
7.前記電極密度が、1.7g/cm3以下である6のエネルギー貯蔵デバイス用電極。
8.前記電極密度が、1.3g/cm3以下である7のエネルギー貯蔵デバイス用電極。
9.集電体の一面あたりのアンダーコート層の目付量が、1,000mg/m2以下である1~8のいずれかのエネルギー貯蔵デバイス用電極。
10.集電体の一面あたりのアンダーコート層の目付量が、500mg/m2以下である9のエネルギー貯蔵デバイス用電極。
11.集電体の一面あたりのアンダーコート層の目付量が、300mg/m2以下である10のエネルギー貯蔵デバイス用電極。
12.集電体の一面あたりのアンダーコート層の目付量が、200mg/m2以下である11のエネルギー貯蔵デバイス用電極。
13.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ものである1~12のいずれかのエネルギー貯蔵デバイス用電極。
14.前記カーボンナノチューブ分散剤が、側鎖にオキサゾリン基を含むビニル系ポリマー又はトリアリールアミン系高分岐ポリマーを含むものである13のエネルギー貯蔵デバイス用電極。
15.前記アンダーコート層が、マトリックス高分子を含むものである1~14のいずれかのエネルギー貯蔵デバイス用電極。
16.前記集電体が、アルミニウム箔又は銅箔である1~15のいずれかのエネルギー貯蔵デバイス用電極。
17.正極である1~16のいずれかのエネルギー貯蔵デバイス用電極。
18.負極である1~16のいずれかのエネルギー貯蔵デバイス用電極。
19.1~18のいずれかのエネルギー貯蔵デバイス用電極を備えるエネルギー貯蔵デバイス。
20.集電体上の少なくとも一方の面にカーボンナノチューブを含むアンダーコート層を形成する工程、該アンダーコート層上に電極合材層を形成する工程、及び1kN/cm未満のプレス圧力でプレスする工程を含むエネルギー貯蔵デバイス用電極の製造方法。
21.前記プレス圧力が、0.5kN/cm以下である20のエネルギー貯蔵デバイス用電極の製造方法。
22.前記プレス圧力が、0.2kN/cm以下である21のエネルギー貯蔵デバイス用電極の製造方法。
23.前記プレス圧力が、0kN/cmである22のエネルギー貯蔵デバイス用電極の製造方法。
本発明のエネルギー貯蔵デバイス用電極は、集電体と、該集電体の少なくとも一方の面に形成されたカーボンナノチューブを含むアンダーコート層と、該アンダーコート層上に形成された電極合材層とを備える積層体を、1kN/cm未満のプレス圧力でプレスしてなるものである。
前記集電体は、従来、エネルギー貯蔵デバイス用電極の集電体として用いられているものを使用することができる。例えば、銅、アルミニウム、チタン、ステンレススチール、ニッケル、金、銀及びこれらの合金や、カーボン材料、金属酸化物、導電性高分子等を用いることができるが、超音波溶接等の溶接を適用して電極構造体を作製する場合、銅、アルミニウム、チタン、ステンレススチール又はこれらの合金からなる金属箔を用いることが好ましい。集電体の厚みは特に限定されないが、本発明においては、1~100μmが好ましい。
前記アンダーコート層は、導電材としてカーボンナノチューブ(CNT)を含む。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(SWCNT)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(DWCNT)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(MWCNT)とがあるが、本発明においては、SWCNT、DWCNT、MWCNTをそれぞれ単体で、又は複数を組み合わせて使用できる。コストの観点からは、特に直径が2nm以上ある多層CNTが好ましく、薄膜化できるという観点からは、特に直径500nm以下の多層CNTが好ましく、直径100nm以下の多層CNTがより好ましく、直径50nm以下の多層CNTがより一層好ましく、直径30nm以下の多層CNTが最も好ましい。なお、CNTの直径は、例えば、CNTを溶媒中に分散させたものを乾燥させて得た薄膜を、透過型電子顕微鏡で観察することで測定することができる。
前記電極合材層は、活物質、バインダーポリマー及び必要に応じて溶媒を含む電極スラリーを、アンダーコート層上に塗布し、自然又は加熱乾燥して形成することができる。
本発明のエネルギー貯蔵デバイスは、前述したエネルギー貯蔵デバイス用電極を備えたものであり、より具体的には、少なくとも一対の正負極と、これら各極間に介在するセパレータと、電解質とを備えて構成され、正負極の少なくとも一方が、前述したエネルギー貯蔵デバイス用電極から構成される。
・プローブ型超音波照射装置:Hielscher Ultrasonics社製、UIP1000
・ワイヤーバーコーター:(株)エスエムテー製、PM-9050MC
・ホモディスパー:プライミクス(株)製、T.K.ロボミックス(ホモディスパー2.5型(φ32)付き)
・薄膜旋回型高速ミキサー:プライミクス(株)製、フィルミクス40型
・自転・公転ミキサー:(株)シンキー製、あわとり練太郎(ARE-310)
・ロールプレス装置:(有)タクミ技研、SA-602
・充放電測定装置:東洋システム(株)製、TOSCAT-3100
・粘着・皮膜剥離解析装置:協和界面科学(株)製、VERSATILE PEEL ANALYZER VPA-3
[製造例1]
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-300((株)日本触媒製、固形分濃度10質量%、重量平均分子量1.2×105、オキサゾリン基量7.7mmol/g)5.0gと、純水37.15gと、2-プロパノール(純正化学(株)製、試薬特級)7.35gとを混合し、更にそこへ導電性炭素材料であるCNT(戸田工業(株)製、TC-2010)0.5g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30分間超音波処理を行い、均一にCNTが分散した分散液を調製した。これに、ポリアクリル酸アンモニウムを含む水溶液であるアロンA-30(東亞合成(株)製、固形分濃度31.6質量%)1.2gと、純水41.35gと、2-プロパノール(純正化学(株)製、試薬特級)7.44gを混合して、アンダーコート組成物Aを調製した。
得られたアンダーコート組成物Aを、集電体であるアルミニウム箔(厚み15μm)にワイヤーバーコーター(OSP-13、ウェット膜厚13μm)で均一に展開後、150℃で30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Aを作製した。目付量を測定した結果、150mg/m2であった。
CNTのかわりにデンカブラック(デンカ(株)製、カーボンブラック)を用いたこと以外は、製造例1と同様の方法でアンダーコート箔Cを調製した。目付量を測定した結果、129mg/m2であった。
[実施例1]
活物質としてリン酸鉄リチウム(LFP、Aleees社製)31.84g、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)クレハ製、KFポリマーL#1120)13.05g、導電材としてデンカブラック1.39g及びNMP13.72gを、ホモディスパーにて8,000rpm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、更に自転・公転ミキサーにて2,200rpmで30秒脱泡することで、電極スラリー(固形分濃度58質量%、LFP:PVDF:デンカブラック=91.5:4.5:4(質量比))を作製した。得られた電極スラリーを、アンダーコート箔A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電極合材層を形成し、更にロールプレス機で0.2kN/cmのプレス圧力でプレスして圧着させ、電極を作製した。
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、セルガード#2400)を一枚重ねた。更に上から、活物質を塗布した面を下にして電極を重ねた。電解液を1滴滴下したのち、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、試験用のリチウムイオン二次電池A1を4個作製した。
ロールプレス機で圧着しなかった(プレス圧力0kN/cm)こと以外は、実施例1と同様の方法で試験用のリチウムイオン二次電池A2を4個作製した。電極密度は、1.27g/cm3であった。
プレス圧力を1kN/cmに変更した以外は、実施例1と同様の方法で試験用のリチウムイオン二次電池A0を4個作製した。電極密度は、2.02g/cm3であった。
アンダーコート箔Aのかわりに無垢のアルミニウム箔を用いたこと以外は、実施例1と同様の方法で試験用のリチウムイオン二次電池B1を4個作製した。電極密度は、1.64g/cm3であった。
アンダーコート箔Aのかわりに無垢のアルミニウム箔を用いたこと以外は、実施例2と同様の方法で試験用のリチウムイオン二次電池B2を4個作製した。電極密度は、1.26g/cm3であった。
アンダーコート箔Aのかわりに無垢のアルミニウム箔を用いたこと以外は、参考例1と同様の方法で試験用のリチウムイオン二次電池B0を4個作製した。電極密度は、2.16g/cm3であった。
アンダーコート箔Aのかわりにアンダーコート箔Cを用いたこと以外は、実施例1と同様の方法で試験用のリチウムイオン二次電池C1を4個作製した。電極密度は、1.62g/cm3であった。
アンダーコート箔Aのかわりにアンダーコート箔Cを用いたこと以外は、実施例2と同様の方法で試験用のリチウムイオン二次電池C2を4個作製した。電極密度は、1.25g/cm3であった。
アンダーコート箔Aのかわりにアンダーコート箔Cを用いたこと以外は、参考例1と同様の方法で試験用のリチウムイオン二次電池C0を4個作製した。電極密度は、2.00g/cm3であった。
(1)電極の密着力の測定
各実施例及び比較例で得られた電極を25mm幅で切り出し、電極合材層塗工面に20mm幅の両面テープを貼り付けてガラス基板上に固定した。これを粘着・皮膜剥離解析装置に固定して剥離角度90°かつ剥離速度100mm/minで剥離試験を行い、密着力を測定した。結果を表2に示す。
アンダーコート箔が電池に及ぼす影響を評価することを目的として、充放電測定装置を用いて、以下の条件で充放電試験を行った。結果を表2に示す。
・試験電池数:4個
・温度:室温
・放電電圧:ステップ2において、各放電条件時の実放電容量を100%とし、10%放電した時点での電圧を放電電圧とした。
・直流抵抗(DCR)測定:4個の試験用電池につき、ステップ2において、各放電条件時の電流値と放電電圧とからDCRを算出し、その平均値を求めた。
2 平行部のチューブ外径
3 くびれ部
4 くびれ部のチューブ外径
Claims (23)
- 集電体と、該集電体の少なくとも一方の面に形成されたカーボンナノチューブを含むアンダーコート層と、該アンダーコート層上に形成された電極合材層とを備える積層体を、1kN/cm未満のプレス圧力でプレスしてなるエネルギー貯蔵デバイス用電極。
- 前記プレス圧力が、0.5kN/cm以下である請求項1記載のエネルギー貯蔵デバイス用電極。
- 前記プレス圧力が、0.2kN/cm以下である請求項2記載のエネルギー貯蔵デバイス用電極。
- 前記プレス圧力が、0kN/cmである請求項3記載のエネルギー貯蔵デバイス用電極。
- 集電体と、該集電体の少なくとも一方の面に形成されたカーボンナノチューブを含むアンダーコート層と、該アンダーコート層上に形成された電極合材層とを備える電極であって、電極密度が2.1g/cm3未満であるエネルギー貯蔵デバイス用電極。
- 前記電極密度が、2.0g/cm3未満である請求項5記載のエネルギー貯蔵デバイス用電極。
- 前記電極密度が、1.7g/cm3以下である請求項6記載のエネルギー貯蔵デバイス用電極。
- 前記電極密度が、1.3g/cm3以下である請求項7記載のエネルギー貯蔵デバイス用電極。
- 集電体の一面あたりのアンダーコート層の目付量が、1,000mg/m2以下である請求項1~8のいずれか1項記載のエネルギー貯蔵デバイス用電極。
- 集電体の一面あたりのアンダーコート層の目付量が、500mg/m2以下である請求項9記載のエネルギー貯蔵デバイス用電極。
- 集電体の一面あたりのアンダーコート層の目付量が、300mg/m2以下である請求項10記載のエネルギー貯蔵デバイス用電極。
- 集電体の一面あたりのアンダーコート層の目付量が、200mg/m2以下である請求項11記載のエネルギー貯蔵デバイス用電極。
- 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ものである請求項1~12のいずれか1項記載のエネルギー貯蔵デバイス用電極。
- 前記カーボンナノチューブ分散剤が、側鎖にオキサゾリン基を含むビニル系ポリマー又はトリアリールアミン系高分岐ポリマーを含むものである請求項13記載のエネルギー貯蔵デバイス用電極。
- 前記アンダーコート層が、マトリックス高分子を含むものである請求項1~14のいずれか1項記載のエネルギー貯蔵デバイス用電極。
- 前記集電体が、アルミニウム箔又は銅箔である請求項1~15のいずれか1項記載のエネルギー貯蔵デバイス用電極。
- 正極である請求項1~16のいずれか1項記載のエネルギー貯蔵デバイス用電極。
- 負極である請求項1~16のいずれか1項記載のエネルギー貯蔵デバイス用電極。
- 請求項1~18のいずれか1項記載のエネルギー貯蔵デバイス用電極を備えるエネルギー貯蔵デバイス。
- 集電体上の少なくとも一方の面にカーボンナノチューブを含むアンダーコート層を形成する工程、該アンダーコート層上に電極合材層を形成する工程、及び1kN/cm未満のプレス圧力でプレスする工程を含むエネルギー貯蔵デバイス用電極の製造方法。
- 前記プレス圧力が、0.5kN/cm以下である請求項20記載のエネルギー貯蔵デバイス用電極の製造方法。
- 前記プレス圧力が、0.2kN/cm以下である請求項21記載のエネルギー貯蔵デバイス用電極の製造方法。
- 前記プレス圧力が、0kN/cmである請求項22記載のエネルギー貯蔵デバイス用電極の製造方法。
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US10840032B1 (en) | 2020-03-24 | 2020-11-17 | Yazaki Corporation | Supercapacitor cell with high-purity binder-free carbonaceous electrode |
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EP3780158A4 (en) | 2022-01-05 |
JPWO2019188556A1 (ja) | 2021-04-01 |
CN111902970A (zh) | 2020-11-06 |
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