WO2016158939A1 - Composition pour couche de mélange d'électrode de batterie secondaire à électrolyte non aqueux, procédé de production de ladite composition et utilisation de ladite composition - Google Patents

Composition pour couche de mélange d'électrode de batterie secondaire à électrolyte non aqueux, procédé de production de ladite composition et utilisation de ladite composition Download PDF

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Publication number
WO2016158939A1
WO2016158939A1 PCT/JP2016/060098 JP2016060098W WO2016158939A1 WO 2016158939 A1 WO2016158939 A1 WO 2016158939A1 JP 2016060098 W JP2016060098 W JP 2016060098W WO 2016158939 A1 WO2016158939 A1 WO 2016158939A1
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Prior art keywords
composition
mixture layer
secondary battery
electrolyte secondary
meth
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PCT/JP2016/060098
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English (en)
Japanese (ja)
Inventor
松崎　英男
直彦 斎藤
守功 松永
伸哉 熊谷
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東亞合成株式会社
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Priority to JP2017510017A priority Critical patent/JP6665857B2/ja
Publication of WO2016158939A1 publication Critical patent/WO2016158939A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/621—Binders
    • H01M4/622—Binders being polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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

Definitions

  • the present invention uses a composition for a non-aqueous electrolyte secondary battery electrode mixture layer that can be used for a lithium ion secondary battery and the like, a production method thereof, and the composition for a non-aqueous electrolyte secondary battery electrode mixture layer.
  • the present invention relates to a nonaqueous electrolyte secondary battery electrode and a nonaqueous electrolyte secondary battery to be obtained.
  • a lithium ion secondary battery As a nonaqueous electrolyte secondary battery, for example, a lithium ion secondary battery is well known. Lithium ion secondary batteries are superior in energy density, output density, charge / discharge cycle characteristics, etc. compared to other secondary batteries such as lead-acid batteries, so mobiles such as smartphones, tablet terminals and laptop computers Used in terminals, it contributes to reducing the size and weight of terminals and improving their performance. On the other hand, secondary batteries for electric vehicles and hybrid vehicles (on-vehicle secondary batteries) have not yet achieved sufficient performance in terms of output, required charging time, and the like.
  • the non-aqueous electrolyte secondary battery is composed of a pair of electrodes disposed via a separator and a non-aqueous electrolyte solution.
  • the electrode is composed of a current collector and a mixture layer formed on the surface thereof, and the mixture layer is coated with a composition (slurry) for the electrode mixture layer containing an active material and a binder on the current collector. And formed by drying or the like.
  • a composition for an electrode mixture layer there is an increasing demand for water-based treatment from the viewpoints of environmental protection and cost reduction.
  • SBR styrene butadiene rubber
  • CMC carboxymethyl cellulose
  • a binder is used.
  • further improvement is desired in order to cope with high-rate characteristics and cycle characteristics required for in-vehicle applications.
  • a solvent-based binder such as polyvinylidene fluoride (PVDF) using an organic solvent such as N-methyl-2-pyrrolidone (NMP) is mainly used, and the above requirements are sufficiently satisfied. No water-based binder has been proposed.
  • Components constituting the lithium ion secondary battery electrode include active materials such as graphite and hard carbon (HC), and carbon-based materials such as conductive additives such as ketjen black (KC) and acetylene black (AB). Often used. In general, these carbon-based materials have poor wettability to an aqueous medium, and in order to obtain a composition for an electrode mixture layer that is uniform and excellent in dispersion stability, an aqueous system excellent in the dispersion stabilization effect of the carbon-based material is used.
  • a binder is desired. As an aqueous binder that can be applied to a lithium ion secondary battery electrode, an aqueous binder containing a crosslinked polyacrylic acid has been proposed as shown below.
  • Patent Document 1 discloses an acrylic acid polymer crosslinked with polyalkenyl ether as a binder for forming a negative electrode coating film of a lithium ion secondary battery. Further, in Patent Document 2, a polymer obtained by crosslinking polyacrylic acid with a specific crosslinking agent is used as a binder, so that the electrode structure is not destroyed even when an active material containing silicon is used. It is described that an excellent capacity retention ratio can be obtained.
  • Patent Document 1 a binder composition containing an acrylic acid polymer crosslinked with a polyalkenyl polyether is disclosed.
  • the binder composition containing the acrylic acid polymer has a high viscosity, and it is difficult to ensure uniformity when kneading and preparing the mixture layer composition by mixing with an active material or the like. There was a risk of effect.
  • the blending composition ratio of the acrylic acid polymer in the binder exceeds 95% by weight, the particle surface of the carbon material is coated and the conductivity is lowered. And has a problem of inhibiting the movement of lithium ions.
  • a binder composed of cross-linked polyacrylic acid having different types of cross-linking agents and different amounts of cross-linking agents is disclosed, and 1 wt% slurry of the cross-linked polyacrylic acid at 0.6 rpm or 60 rpm is disclosed. Viscosity is described ([Table 3] etc.). However, the binder composition containing cross-linked polyacrylic acid having a specific viscosity value of 60 rpm has a low viscosity, and there is concern about dispersion stability and binding properties of active materials and the like. .
  • the binder composition containing a cross-linked polyacrylic acid specifically having a viscosity value of 0.6 rpm has a high viscosity, and the uniformity in kneading and preparing the mixture layer composition is reduced.
  • the electrode characteristics may be adversely affected.
  • neither patent document 1 nor 2 describes anything about the high rate characteristics.
  • the present invention has been made in view of such circumstances, and is a non-aqueous electrolyte secondary battery including an aqueous binder that can satisfy both electrode characteristics such as high rate characteristics and durability (cycle characteristics). It aims at providing the composition for electrode mixture layers, and its manufacturing method. Another object of the present invention is to provide a non-aqueous electrolyte secondary battery electrode and a non-aqueous electrolyte secondary battery obtained by using the composition for an aqueous electrode mixture layer.
  • the present inventors have found a crosslinked polymer of ethylenically unsaturated carboxylic acid monomer and a salt thereof in which a 0.5 wt% aqueous dispersion has a specific viscosity range.
  • the binder to be included the present inventors have obtained knowledge that the high rate characteristics can be improved since excellent binding properties are exhibited even in a small amount.
  • the said binder was excellent in binding property, it discovered that it was effective also with respect to the durability (cycle characteristic) improvement of an electrode.
  • composition for a mixture layer containing the binder has a viscosity suitable for electrode preparation, it is possible to obtain a nonaqueous electrolyte secondary battery electrode having a uniform mixture layer and good electrode characteristics. It was.
  • the present invention has been completed based on these findings.
  • a composition for a non-aqueous electrolyte secondary battery electrode mixture layer comprising an active material, water and a binder
  • the binder contains a cross-linked polymer of a monomer component containing an ethylenically unsaturated carboxylic acid monomer and a salt thereof,
  • the viscosity of a 0.5 wt% aqueous dispersion of the crosslinked polymer at a neutralization degree of 90 mol% is 5,000 to 40,000 mPa ⁇ s
  • the cross-linked polymer is cross-linked with a cross-linkable monomer, and the use amount of the cross-linkable monomer is 0.05 to 0.05 with respect to the total amount of monomers other than the cross-linkable monomer.
  • composition for a non-aqueous electrolyte secondary battery electrode mixture layer according to any one of [1] to [3], wherein the degree of neutralization of the crosslinked polymer is 20 to 100 mol%.
  • a method for producing a composition for a non-aqueous electrolyte secondary battery electrode mixture layer A monomer component containing an ethylenically unsaturated carboxylic acid monomer and a crosslinkable monomer is precipitated and polymerized in an aqueous medium, and the viscosity of a 0.5 wt% aqueous dispersion at a neutralization degree of 90 mol% is 5, After obtaining a crosslinked polymer of 000 to 40,000 mPa ⁇ s, A method for producing a composition for a non-aqueous electrolyte secondary battery electrode mixture layer by mixing with an active material and water.
  • Non-aqueous electrolyte 2 comprising a mixture layer formed on the current collector surface from the composition for a non-aqueous electrolyte secondary battery electrode mixture layer according to any one of [1] to [4].
  • Secondary battery electrode [1] A nonaqueous electrolyte secondary battery comprising the nonaqueous electrolyte secondary battery electrode according to [6], a separator, and a nonaqueous electrolyte solution.
  • the binder used in the composition for a nonaqueous electrolyte secondary battery electrode mixture layer of the present invention exhibits excellent binding properties even in a small amount. For this reason, it becomes possible to reduce the binder content in the composition for the mixture layer, and it is possible to obtain an electrode having high high-rate characteristics and excellent durability (cycle characteristics). Moreover, since the composition for a nonaqueous electrolyte secondary battery electrode mixture layer of the present invention has a viscosity suitable for electrode production, the nonaqueous electrolyte secondary battery electrode has a uniform mixture layer and good electrode characteristics. Can be obtained.
  • (meth) acryl means acryl and / or methacryl
  • (meth) acrylate means acrylate and / or methacrylate
  • the “(meth) acryloyl group” means an acryloyl group and / or a methacryloyl group.
  • the composition for a nonaqueous electrolyte secondary battery electrode mixture layer comprises a crosslinked polymer of a monomer component containing an ethylenically unsaturated carboxylic acid monomer, a binder containing the salt, an active material, and water. It contains.
  • the composition described above may be in a slurry state that can be applied to the current collector, or may be prepared in a wet powder state so that it can be applied to pressing on the surface of the current collector.
  • a nonaqueous electrolyte secondary battery electrode of the present invention is obtained by forming a mixture layer formed from the above composition on the surface of a current collector such as a copper foil or an aluminum foil.
  • the composition for the secondary battery electrode mixture layer and the production method thereof, and the components of the nonaqueous electrolyte secondary battery and the nonaqueous electrolyte secondary battery obtained by using the composition will be described in detail. .
  • the binder of the present invention contains a cross-linked polymer of a monomer component containing an ethylenically unsaturated carboxylic acid monomer and a salt thereof.
  • ethylenically unsaturated carboxylic acid monomer include (meth) acrylic acid, crotonic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid, monobutyl itaconic acid, monobutyl maleate, and cyclohexanedicarboxylic acid.
  • vinyl monomers having a carboxyl group such as acid, or (partial) alkali neutralized products thereof. One of these may be used alone, or two or more may be used in combination. May be.
  • carbon such as (meth) acrylic acid, crotonic acid, itaconic acid, maleic acid, maleic anhydride, and fumaric acid is preferable in that the primary chain length of the obtained polymer is long and the binding power of the binder is good.
  • carboxylic acid monomers and salts thereof are preferred, and acrylic acid is more preferred.
  • the types of salts include alkali metal salts such as lithium, sodium and potassium; alkaline earth metal salts such as calcium salts and barium salts; other metal salts such as magnesium salts and aluminum salts; ammonium salts and organic amine salts Is mentioned. Of these, alkali metal salts and magnesium salts are preferred, and alkali metal salts are more preferred because they are less likely to adversely affect battery characteristics.
  • non-crosslinkable monomers other than the ethylenically unsaturated carboxylic acid monomer can be used in combination as the monomer component.
  • Other non-crosslinkable monomers include (meth) acrylic acid alkyl esters, (meth) acrylic acid hydroxyalkyl esters, aromatic vinyl compounds, amino group-containing vinyl compounds, amide group-containing vinyl compounds, sulfonic acid group-containing vinyls. Examples thereof include a compound, a polyoxyalkylene group-containing vinyl compound, and an alkoxyl group-containing vinyl compound. These compounds can be used alone or in combination of two or more.
  • Specific compounds of the above (meth) acrylic acid alkyl ester include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, and (meth) acrylic.
  • N-butyl acid isobutyl (meth) acrylate, sec-butyl (meth) acrylate, tert-butyl (meth) acrylate, n-pentyl (meth) acrylate, isoamyl (meth) acrylate, (meth) acrylic
  • acrylic acid ester compounds having a linear, branched or cyclic alkyl group, such as hexyl acid, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and octyl (meth) acrylate.
  • (meth) acrylic acid hydroxyalkyl ester examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and (meth) Examples include ⁇ -caprolactone adduct of 2-hydroxyethyl acrylate.
  • aromatic vinyl compound examples include styrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, ⁇ -methylstyrene, 2,4-dimethylstyrene, 2,4-diisopropylstyrene, and 4-tert-butylstyrene.
  • amino group-containing vinyl compound examples include dimethylaminomethyl (meth) acrylate, diethylaminomethyl (meth) acrylate, 2-dimethylaminoethyl (meth) acrylate, 2-diethylaminoethyl (meth) acrylate, (meth) 2- (di-n-propylamino) ethyl acrylate, 2-dimethylaminopropyl (meth) acrylate, 2-diethylaminopropyl (meth) acrylate, 2- (di-n-propylamino) (meth) acrylate And propyl, 3-dimethylaminopropyl (meth) acrylate, 3-diethylaminopropyl (meth) acrylate, 3- (di-n-propylamino) propyl (meth) acrylate, and the like.
  • amide group-containing vinyl compound examples include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N-isopropylacrylamide, Nt-butylacrylamide and the like. It is done.
  • sulfonic acid group-containing vinyl compound examples include methallylsulfonic acid, (meth) acrylamido-2-methyl-2-propanesulfonic acid, and the like.
  • polyoxyalkylene group-containing vinyl compound examples include (meth) acrylic acid esters of alcohols having a polyoxyethylene group and / or a polyoxypropylene group.
  • alkoxyl group-containing vinyl compound examples include 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2- (n-propoxy) ethyl (meth) acrylate, and 2- (meth) acrylic acid 2- (N-butoxy) ethyl, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 2- (n-propoxy) propyl (meth) acrylate, 2- (n) (meth) acrylate -Butoxy) propyl and the like.
  • the proportion of the ethylenically unsaturated carboxylic acid monomer in the total amount of the non-crosslinkable monomer is preferably in the range of 50 to 100% by weight, more preferably in the range of 70 to 100% by weight, and 90 to 100% by weight. The range is more preferable, and the range of 95 to 100% by weight is more preferable.
  • the polymer has a carboxyl group, it has an excellent desolvation effect and ion conductivity of lithium ions, so that an electrode having low resistance and excellent high rate characteristics can be obtained.
  • the proportion of the ethylenically unsaturated carboxylic acid monomer in the total amount of the non-crosslinkable monomer is 50% by weight or more, the effect of the carboxyl group can be sufficiently imparted.
  • a crosslinkable monomer in addition to the non-crosslinkable monomer, a crosslinkable monomer may be used.
  • the crosslinkable monomer include a polyfunctional polymerizable monomer having two or more polymerizable unsaturated groups, and a monomer having a self-crosslinkable functional group such as a hydrolyzable silyl group.
  • the polyfunctional polymerizable monomer is a compound having two or more polymerizable functional groups such as (meth) acryloyl group and alkenyl group in the molecule, and is a polyfunctional (meth) acrylate compound, polyfunctional alkenyl compound, ( Examples include compounds having both a (meth) acryloyl group and an alkenyl group.
  • These compounds may be used alone or in combination of two or more.
  • a compound having one or more alkenyl groups in the molecule such as a polyfunctional alkenyl compound and a compound having both a (meth) acryloyl group and an alkenyl group is preferable in that a uniform crosslinked structure can be easily obtained.
  • a compound having both a (meth) acryloyl group and an alkenyl group is more preferable because the reactivity is good and an unreacted product hardly remains.
  • the coating properties of the mixture layer composition and This is particularly preferable since the binding property and the bending resistance of the obtained electrode are more excellent.
  • Polyfunctional (meth) acrylate compounds include ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di ( Di (meth) acrylates of dihydric alcohols such as (meth) acrylate; trimethylolpropane tri (meth) acrylate, trimethylolpropane ethylene oxide modified tri (meth) acrylate, glycerin tri (meth) acrylate, pentaerythritol tri ( Poly (meth) acrylates such as tri (meth) acrylates and tetra (meth) acrylates of trihydric or higher polyhydric alcohols such as (meth) acrylates and pentaerythritol tetra (meth) acrylates Relate can be mentioned.
  • polyfunctional alkenyl compound examples include trimethylolpropane diallyl ether, pentaerythritol diallyl ether, pentaerythritol triallyl ether, tetraallyloxyethane, polyallyl saccharose and the like; polyfunctional allyl compounds such as diallyl phthalate; divinyl Examples thereof include polyfunctional vinyl compounds such as benzene.
  • Examples of the compound having both (meth) acryloyl group and alkenyl group include allyl (meth) acrylate, isopropenyl (meth) acrylate, butenyl (meth) acrylate, pentenyl (meth) acrylate, (meth) acrylic acid. 2- (2-vinyloxyethoxy) ethyl and the like can be mentioned.
  • Examples of other polyfunctional polymerizable monomers include bisamides such as methylene bisacrylamide and hydroxyethylene bisacrylamide.
  • the monomer having a crosslinkable functional group capable of self-crosslinking include hydrolyzable silyl group-containing vinyl monomers, N-methylol (meth) acrylamide, N-methoxyalkyl (meth) acrylate, and the like. Is mentioned. These compounds can be used alone or in combination of two or more.
  • the hydrolyzable silyl group-containing vinyl monomer is not particularly limited as long as it is a vinyl monomer having at least one hydrolyzable silyl group.
  • vinyl silanes such as vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, and vinyldimethylmethoxysilane
  • silyl such as trimethoxysilylpropyl acrylate, triethoxysilylpropyl acrylate, and methyldimethoxysilylpropyl acrylate Group-containing acrylic acid esters
  • silyl group-containing methacrylates such as trimethoxysilylpropyl methacrylate, triethoxysilylpropyl methacrylate, methyldimethoxysilylpropyl methacrylate, dimethylmethoxysilylpropyl methacrylate
  • trimethoxysilylpropyl vinyl ether etc.
  • the degree of crosslinking of the crosslinked polymer of the present invention is relatively low.
  • the amount of the cross-linkable monomer used is the total amount of monomers other than the cross-linkable monomer (non-cross-linkable monomer). On the other hand, it is preferably 0.05 to 1.0 mol%, more preferably 0.1 to 0.8 mol%. If the usage-amount of a crosslinkable monomer is the said range, the binder which has the more outstanding binding force can be obtained.
  • the amount of the crosslinkable monomer used is 0.05 to 0.5 mol%.
  • the content is 0.2 to 0.5 mol%.
  • the amount of the crosslinkable monomer used is preferably 0.1 to 1.0 mol%, preferably 0.3 to 0.8 mol. % Is more preferable.
  • the crosslinked polymer of the present invention may be crosslinked with a compound having two or more functional groups capable of reacting with a carboxyl group introduced into the polymer in addition to the above-mentioned crosslinkable monomer.
  • the compound having two or more functional groups capable of reacting with a carboxyl group include the following compounds. i) A compound that forms a covalent bond with a carboxyl group such as an epoxy group, a carbodiimide group, or an oxazoline group. ii) A compound having Ca 2+ , Mg 2+ and the like and forming an ionic bond with a carboxyl group. iii) A compound having Zn 2+ , Al 3+ , Fe 3+ and the like and forming a coordinate bond with a carboxyl group.
  • the viscosity is in the range of 5,000 to 40,000 mPa ⁇ s.
  • the viscosity is measured by the B-type viscosity at the liquid temperature 25 (rotor rotation speed 20 rpm).
  • the viscosity of the 0.5 wt% aqueous dispersion is preferably in the range of 10,000 to 40,000 mPa ⁇ s, more preferably in the range of 20,000 to 40,000 mPa ⁇ s, and even more preferably 30 , 000 to 40,000 mPa ⁇ s.
  • the viscosity When the viscosity is less than 5,000 mPa ⁇ s, the dispersion stability of the active material may not be sufficient, and an electrode having a uniform mixture layer may not be obtained. In addition, sufficient binding properties may not be obtained. On the other hand, when the viscosity exceeds 40,000 mPa ⁇ s, kneading at the time of preparing the composition for electrode mixture layer may be difficult, and the uniformity of the composition for mixture layer obtained may be reduced. Battery characteristics may be adversely affected.
  • the cross-linked polymer When the cross-linked polymer is not neutralized or has a neutralization degree of less than 90 mol%, it is neutralized in an aqueous medium with an alkali compound to a neutralization degree of 90 mol%, and after making a 0.5 wt% aqueous dispersion, the viscosity is taking measurement. When the degree of neutralization of the cross-linked polymer exceeds 90 mol%, 0.5 wt% after the neutralization degree is adjusted to 90 mol% with the addition of an appropriate acid such as sulfuric acid or the like. Measure the viscosity of the% aqueous dispersion.
  • the toughness increases, it becomes possible to obtain high binding properties, and the viscosity of the aqueous dispersion increases.
  • a crosslinked polymer (salt) obtained by subjecting a polymer having a long primary chain length to a relatively small amount of crosslinking exists as a microgel body swollen in water in water.
  • the viscosity of the aqueous dispersion also increases.
  • the water swellability of the crosslinked polymer is limited, and as a result, the viscosity of the aqueous dispersion tends to decrease.
  • a thickening effect and a dispersion stabilizing effect are expressed by the interaction of the microgel bodies.
  • the interaction of the microgel body varies depending on the water swelling degree of the microgel body and the strength of the microgel body, and these are controlled by the crosslinking degree of the crosslinked polymer.
  • the degree of crosslinking is too low, the strength of the microgel is insufficient, and the dispersion stabilizing effect and the binding property may be insufficient.
  • the degree of crosslinking is too high, the degree of swelling of the microgel may be insufficient and the dispersion stabilizing effect and binding properties may be insufficient.
  • the cross-linked polymer is desirably a micro-crosslinked polymer obtained by appropriately crosslinking a polymer having a sufficiently long primary chain length.
  • the degree of crosslinking of the crosslinked polymer of the present invention is relatively low, even an aqueous dispersion having a low concentration of 0.5% by weight exhibits a viscosity of 5,000 mPa ⁇ s or more due to microgel packing. Therefore, it is assumed that the primary chain length is sufficiently long and has an appropriate degree of crosslinking. Since the binder made of such a crosslinked polymer exhibits excellent binding properties, the amount of the binder used can be reduced, and the high rate characteristics of the electrode can be improved.
  • the crosslinked polymer of the present invention is used as a salt form in which an acid group such as a carboxyl group derived from an ethylenically unsaturated carboxylic acid monomer is neutralized so that the degree of neutralization is 20 to 100 mol%. Is preferred.
  • the neutralization degree is more preferably 50 to 100 mol%, and further preferably 60 to 95 mol%. When the degree of neutralization is 20 mol% or more, water swellability is good and a dispersion stabilizing effect is easily obtained.
  • the amount of the crosslinked polymer and its salt used in the composition for electrode mixture layer of the present invention is 0.5 to 5.0% by weight based on the total amount of the active material.
  • the amount used is preferably 1.0 to 5.0% by weight, more preferably 1.5 to 5.0% by weight, and still more preferably 2.0 to 5.0 parts by weight.
  • the amount of the crosslinked polymer and its salt used is less than 0.5% by weight, sufficient binding properties may not be obtained. Further, the dispersion stability of the active material or the like becomes insufficient, and the uniformity of the formed mixture layer may be lowered.
  • the usage-amount of a crosslinked polymer and its salt exceeds 5.0 weight%, the composition for electrode mixture layers may become high viscosity, and the coating property to a collector may fall. As a result, bumps and irregularities are generated in the obtained mixture layer, which may adversely affect the electrode characteristics. In addition, the interface resistance increases, and there is a concern that the high-rate characteristics will deteriorate. If the use amount of the crosslinked polymer and its salt is within the above range, a composition having excellent dispersion stability can be obtained, and a mixture layer having extremely high adhesion to the current collector can be obtained. As a result, the durability of the battery is improved. Furthermore, since the amount used is as small as 0.5 to 5.0% by weight with respect to the active material, and the polymer has a carboxy anion, an electrode having low interface resistance and excellent high rate characteristics can be obtained. .
  • the crosslinked polymer of the present invention can use a known polymerization method such as solution polymerization, precipitation polymerization, suspension polymerization, reverse phase emulsion polymerization, etc., but has a long primary chain length and is appropriately crosslinked.
  • Precipitation polymerization is preferred in that the polymer can be produced efficiently.
  • Precipitation polymerization is a method for producing a polymer by carrying out a polymerization reaction in a solvent that dissolves an unsaturated monomer as a raw material but does not substantially dissolve the produced polymer.
  • the polymer particles become larger due to aggregation and growth, and a dispersion of polymer particles in which primary particles of several tens to several hundreds of nm are aggregated to several ⁇ m to several tens of ⁇ m is obtained.
  • a dispersion stabilizer can also be used to control the particle size of the polymer.
  • the polymerization solvent may be a solvent selected from water and various organic solvents in consideration of the type of monomer used. In order to obtain a polymer having a longer primary chain length, it is preferable to use a solvent having a small chain transfer constant.
  • specific polymerization solvents when the ethylenically unsaturated carboxylic acid monomer is polymerized in an unneutralized state, examples thereof include benzene, ethyl acetate, dichloroethane, n-hexane, cyclohexane, and n-heptane. These can be used alone or in combination of two or more.
  • water-soluble solvents such as methanol, t-butyl alcohol, acetone and tetrahydrofuran can be used.
  • methanol, t-butyl alcohol, acetone and tetrahydrofuran can be used.
  • One of these may be used alone or 2
  • a combination of more than one species can be used.
  • the water-soluble solvent refers to a solvent having a solubility in water at 20 ° C. of more than 10 g / 100 ml.
  • a (partial) neutralized product of an ethylenically unsaturated carboxylic acid monomer is precipitated in an aqueous medium containing water and a water-soluble solvent because a polymer having excellent dispersion stability of the active material is obtained.
  • a polymerization method is preferred.
  • the ratio of the water-soluble solvent contained in the aqueous medium is preferably 50 to 100% by weight, more preferably 70 to 100% by weight, and still more preferably 90 to 100% by weight with respect to the total amount of the aqueous medium.
  • the polymerization initiator may be a known polymerization initiator such as an azo compound, an organic peroxide, or an inorganic peroxide, but is not particularly limited.
  • the conditions of use can be adjusted by a known method such as thermal initiation, redox initiation using a reducing agent in combination, UV initiation, or the like so as to obtain an appropriate radical generation amount.
  • thermal initiation redox initiation using a reducing agent in combination
  • UV initiation or the like so as to obtain an appropriate radical generation amount.
  • Examples of the azo compound include 2,2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (N-butyl-2-methylpropionamide), 2- (tert-butylazo) -2. -Cyanopropane, 2,2'-azobis (2,4,4-trimethylpentane), 2,2'-azobis (2-methylpropane), etc., and one or more of these are used be able to.
  • organic peroxide examples include 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane (manufactured by NOF Corporation, trade name “Pertetra A”), 1,1-di (t- Hexylperoxy) cyclohexane (same as “Perhexa HC”), 1,1-di (t-butylperoxy) cyclohexane (same as “PerhexaC”), n-butyl-4,4-di (t-butylperoxy) Valerate ("Perhexa V"), 2,2-di (t-butylperoxy) butane ("Perhexa 22"), t-butyl hydroperoxide ("Perbutyl H”), cumene hydroperoxide (Japan) Made by Oil Co., Ltd., trade name “Park Mill H”), 1,1,3,3-tetramethylbutyl hydroperoxide (“Perocta H”), t-
  • inorganic peroxide examples include potassium persulfate, sodium persulfate, and ammonium persulfate.
  • potassium persulfate sodium persulfate
  • sodium persulfate sodium persulfate
  • ammonium persulfate sodium sulfite, sodium thiosulfate, sodium formaldehyde sulfoxylate, ascorbic acid, sulfurous acid gas (SO 2 ), ferrous sulfate and the like can be used as a reducing agent.
  • the preferred use amount of the polymerization initiator is 0.001 to 2 parts by weight, more preferably 0.005 to 1 part by weight, further preferably 100 parts by weight based on the total amount of monomer components to be used. Is 0.01 to 0.1 parts by weight.
  • the amount of the polymerization initiator used is 0.001 part or more, the polymerization reaction can be stably performed, and when it is 2 parts or less, a polymer having a long primary chain length is easily obtained.
  • the concentration of the monomer component is usually in the range of about 2 to 30% by weight.
  • Polymerization takes place at The monomer concentration at the start of polymerization is preferably 5 to 30% by weight, more preferably 15 to 30% by weight, and even more preferably 20 to 30% by weight.
  • the polymerization temperature is preferably 0 to 100 ° C., more preferably 20 to 80 ° C., although it depends on conditions such as the type and concentration of the monomer used.
  • the polymerization temperature may be constant or may change during the polymerization reaction.
  • the polymerization time is preferably 1 minute to 10 hours, more preferably 10 minutes to 5 hours, and further preferably 30 minutes to 2 hours.
  • the binder of the present invention comprises a cross-linked polymer of a monomer component containing the ethylenically unsaturated carboxylic acid monomer and a salt thereof, but in addition to this, a styrene / butadiene latex (SBR). ),
  • SBR styrene / butadiene latex
  • Other binder components such as acrylic latex and polyvinylidene fluoride latex can be used in combination.
  • the amount used is preferably 5% by weight or less, more preferably 2% by weight or less, still more preferably 1% by weight or less based on the active material. .
  • the amount of other binder components used exceeds 5% by weight, the resistance increases and the high rate characteristics may be insufficient.
  • the mixture layer composition for a non-aqueous electrolyte secondary battery of the present invention contains a binder, an active material, and water composed of the crosslinked polymer and a salt thereof.
  • a lithium salt of a transition metal oxide is mainly used as a positive electrode active material.
  • a layered rock salt type and a spinel type lithium-containing metal oxide can be used.
  • Specific compounds of the positive electrode active material of layered rock-salt, lithium cobaltate, lithium nickelate, and, NCM ⁇ Li (Ni x, Co y, Mn z), x + y + x 1 ⁇ called ternary and NCA ⁇ Li (Ni 1-ab Co a Al b ) ⁇ and the like.
  • the spinel positive electrode active material include lithium manganate.
  • oxides, phosphates, silicates, sulfur and the like are used, and examples of the phosphate include olivine type lithium iron phosphate.
  • the positive electrode active material one of the above may be used alone, or two or more may be used in combination as a mixture or a composite.
  • the dispersion When the layered rock salt type positive electrode active material is dispersed in water, the dispersion exhibits alkalinity by exchanging lithium ions on the surface of the active material and hydrogen ions in water. For this reason, there exists a possibility that the aluminum foil (Al) etc. which are general collector materials for positive electrodes may be corroded. In such a case, it is preferable to neutralize the alkali content eluted from the active material by using an unneutralized or partially neutralized crosslinked polymer as a binder. The amount of unneutralized or partially neutralized cross-linked polymer is used so that the amount of unneutralized carboxyl groups in the cross-linked polymer is equal to or greater than the amount of alkali eluted from the active material. It is preferable.
  • any positive electrode active material has low electrical conductivity, it is common to add a conductive auxiliary agent.
  • the conductive assistant include carbon-based materials such as carbon black, carbon nanotube, carbon fiber, graphite fine powder, and carbon fiber. Among these, carbon black, carbon nanotube, and carbon fiber are easy to obtain excellent conductivity. Are preferred. Moreover, as carbon black, ketjen black and acetylene black are preferable.
  • the conductive assistant one of the above may be used alone, or two or more may be used in combination.
  • the amount of the conductive aid used is preferably 2 to 20% by weight and more preferably 2 to 10% by weight with respect to the total amount of the active material from the viewpoint of achieving both conductivity and energy density.
  • the positive electrode active material may be a surface coated with a conductive carbon-based material.
  • examples of the negative electrode active material include carbon materials, lithium metals, lithium alloys, metal oxides, and the like, and one or more of them can be used in combination.
  • active materials composed of carbon-based materials such as natural graphite, artificial graphite, hard carbon, and soft carbon (hereinafter, also referred to as “carbon-based active material”) are preferable, graphite such as natural graphite and artificial graphite, and Hard carbon is more preferable.
  • carbon-based active material such as natural graphite, artificial graphite, hard carbon, and soft carbon
  • graphite such as natural graphite and artificial graphite
  • Hard carbon is more preferable.
  • spheroidized graphite is preferably used from the viewpoint of battery performance, and the preferred particle size range is 1 to 20 ⁇ m, and the more preferred range is 5 to 15 ⁇ m.
  • silicon has a higher capacity than graphite, and an active material composed of silicon-based materials such as silicon, silicon alloys and silicon oxides such as silicon monoxide (SiO) (hereinafter referred to as “silicon-based active material”).
  • silicon-based active material has a high capacity, but has a large volume change due to charge / discharge. For this reason, it is preferable to use together with the carbon-based active material.
  • the compounding amount of the silicon-based active material is large, the electrode material may be collapsed and the cycle characteristics (durability) may be greatly reduced.
  • the amount used is preferably 60% by mass or less, and more preferably 30% by mass or less with respect to the carbon-based active material.
  • the carbon-based active material itself has good electrical conductivity, it is not always necessary to add a conductive additive.
  • a conductive additive is added for the purpose of further reducing resistance, the amount used is preferably 10% by weight or less, preferably 5% by weight or less based on the total amount of the active material from the viewpoint of energy density. Is more preferable.
  • the amount of the active material used is preferably in the range of 10 to 75% by weight, preferably 30 to 65% by weight, based on the total amount of the composition. More preferably, it is the range.
  • the amount of the active material used is 10% by weight or more, the migration of the binder and the like is suppressed, and the medium drying cost is advantageous.
  • it is 75 weight% or less, the fluidity
  • the amount of the active material used is preferably in the range of 60 to 97% by weight, preferably 70 to 90% by weight with respect to the total amount of the composition. A range is more preferable. Further, from the viewpoint of energy density, it is preferable that the non-volatile components other than the active material such as the binder and the conductive assistant are as small as possible within a range in which necessary binding properties and conductivity are ensured.
  • the composition for a nonaqueous electrolyte secondary battery electrode mixture layer of the present invention uses water as a medium.
  • water-soluble organic solvents such as lower alcohols such as methanol and ethanol, carbonates such as ethylene carbonate, ketones such as acetone, tetrahydrofuran, N-methylpyrrolidone, etc. It is good also as a mixed solvent.
  • the proportion of water in the mixed medium is preferably 50% by weight or more, and more preferably 70% by weight or more.
  • the content of the medium containing water in the entire composition is determined from the viewpoints of slurry coating properties, energy costs required for drying, and productivity. Is preferably in the range of 25 to 90% by weight, more preferably in the range of 35 to 70% by weight. Further, in the case of a pressable wet powder state, the content of the medium is preferably in the range of 3 to 40% by weight, more preferably in the range of 10 to 30% by weight from the viewpoint of the uniformity of the mixture layer after pressing. .
  • composition for a non-aqueous electrolyte secondary battery electrode mixture layer and method for producing the same comprises the above active material, water and binder as essential components, and by mixing each component using known means. can get.
  • the mixing method of each component is not particularly limited, and a known method can be adopted. However, after dry blending the powder components such as the active material, the conductive auxiliary agent and the crosslinked polymer particles as a binder, A method of mixing and dispersing and kneading with a dispersion medium such as the above is preferable.
  • the composition for an electrode mixture layer is obtained in a slurry state, it is preferable to finish the slurry without any poor dispersion or aggregation.
  • a mixing means known mixers such as a planetary mixer, a thin film swirl mixer, and a self-revolving mixer can be used, but a thin film swirl mixer is used because a good dispersion state can be obtained in a short time. It is preferable to carry out.
  • a thin film swirling mixer it is preferable to perform preliminary dispersion with a stirrer such as a disper in advance.
  • the viscosity of the slurry is preferably in the range of 500 to 100,000 mPa ⁇ s, and more preferably in the range of 1,000 to 50,000 mPa ⁇ s as the B-type viscosity at 60 rpm.
  • the electrode mixture layer composition when obtained in a wet powder state, it is preferably kneaded to a uniform state with no density unevenness using a planetary mixer, a biaxial kneader or the like.
  • the electrode for nonaqueous electrolyte secondary batteries of the present invention comprises a mixture layer formed from the above composition for an electrode mixture layer on the surface of a current collector such as copper or aluminum.
  • the mixture layer is formed by coating the surface of the current collector with the composition for electrode mixture layer of the present invention, and then drying and removing a medium such as water.
  • the method for applying the mixture layer composition is not particularly limited, and a known method such as a doctor blade method, a dip method, a roll coat method, a comma coat method, a curtain coat method, a gravure coat method, and an extrusion method is adopted. be able to.
  • the said drying can be performed by well-known methods, such as hot air spraying, pressure reduction, (far) infrared rays, and microwave irradiation.
  • the mixture layer obtained after drying is subjected to a compression treatment by a die press, a roll press or the like.
  • a compression treatment by a die press, a roll press or the like.
  • the strength of the mixture layer and the adhesiveness to the current collector can be improved. It is preferable to adjust the thickness of the mixture layer by compression to about 30 to 80% before compression, and the thickness of the mixture layer after compression is generally about 4 to 200 ⁇ m.
  • the nonaqueous electrolyte secondary battery of the present invention comprises the electrode for a nonaqueous electrolyte secondary battery according to the present invention, a separator, and a nonaqueous electrolyte solution.
  • the separator is disposed between the positive electrode and the negative electrode of the battery, and plays a role of ensuring ionic conductivity by preventing a short circuit due to contact between both electrodes and holding an electrolytic solution.
  • the separator is preferably a film-like insulating microporous film having good ion permeability and mechanical strength.
  • polyolefins such as polyethylene and polypropylene, polytetrafluoroethylene, and the like can be used.
  • non-aqueous electrolyte solution a known one generally used for non-aqueous electrolyte secondary batteries can be used.
  • the solvent include cyclic carbonates having a high dielectric constant such as propylene carbonate and ethylene carbonate and high electrolyte dissolving ability, and low-viscosity chain carbonates such as ethyl methyl carbonate, dimethyl carbonate, and diethyl carbonate. These can be used alone or as a mixed solvent.
  • the non-aqueous electrolyte solution is used by dissolving lithium salts such as LiPF 6 , LiSbF 6 , LiBF 4 , LiClO 4 , LiAlO 4 in these solvents.
  • the non-aqueous electrolyte secondary battery of the present invention can be obtained by storing a positive electrode plate and a negative electrode plate partitioned by a separator in a spiral or laminated structure in a case or the like.
  • the mixture was mixed with water so that the concentration of the crosslinked polymer R-1 obtained above was 0.5% by weight, and stirred until it became a transparent uniform dispersed (swelled) state. After adjusting the obtained dispersion to 25 ⁇ 1 ° C., the viscosity at a rotor rotational speed of 20 rpm was measured using a B-type viscometer TVB-10 (manufactured by Toki Sangyo Co., Ltd.).
  • the polymerization reaction liquid (polymer slurry) was filtered by suction filtration.
  • the polymer separated by filtration was washed with twice the amount of ethyl acetate as the polymerization reaction solution, and then the filter cake was collected and vacuum dried at 100 ° C. for 6 hours to obtain a powdery crosslinked polymer R-11. Since crosslinked polymer R-11 has a hygroscopic property, it was hermetically stored in a container having a water vapor barrier property.
  • AA Acrylic acid
  • AAM Acrylamide
  • AMA Allyl methacrylate
  • P-30 Pentaerythritol triallyl ether (trade name “Neoallyl P-30” manufactured by Daiso Corporation)
  • T-20 Trimethylolpropane diallyl ether (Daiso Co., Ltd., trade name “Neoallyl T-20”)
  • ACVA 4,4′-azobiscyanovaleric acid (Otsuka Chemical Co., Ltd.)
  • V-65 2,2′-azobis (2,4-dimethylvaleronitrile) (manufactured by Wako Pure Chemical Industries, Ltd.)
  • Nonaqueous Electrolyte Secondary Battery Electrode Example 1-1 Regarding the composition for the mixture layer using graphite as the negative electrode active material and the cross-linked polymer R-1 as the binder, the coating property and the peel strength between the formed mixture layer / current collector (that is, binder binding) Property). Take 100 parts of artificial graphite (trade name “CGB-10” manufactured by Nippon Graphite Co., Ltd.) and 3 parts of powdered cross-linked polymer R-1, mix well in advance, add 126 parts of ion-exchanged water, and use a disper.
  • artificial graphite trade name “CGB-10” manufactured by Nippon Graphite Co., Ltd.
  • this dispersion is performed for 15 seconds under the condition of a peripheral speed of 20 m / sec using a thin film swirling mixer (manufactured by PRIMIX Co., Ltd., FM-56-30) to obtain a slurry-like negative electrode mixture layer A composition was obtained.
  • a variable applicator the mixture layer composition was coated on a 20 ⁇ m thick copper foil (manufactured by Nihon Foil Co., Ltd.) so that the film thickness after drying was 50 ⁇ m, and then immediately in the ventilation dryer. The mixture layer was formed by drying at 100 ° C. for 10 minutes.
  • the mixture layer density was adjusted to 1.7 ⁇ 0.05 g / cm 3 with a roll press machine to prepare an electrode, and then cut into a 25 mm width strip to prepare a peel test sample.
  • the mixture layer surface of the above sample was attached to a double-sided tape fixed to a horizontal surface, 90 ° peeling was performed at a tensile speed of 50 mm / min, and the peel strength between the mixture layer and the copper foil was measured.
  • the peel strength was as high as 4.5 N / m.
  • Examples 1-2 to 1-12 and Comparative Examples 1-1 to 1-5 A mixture layer composition was prepared by the same operation as in Example 1-1 except that the crosslinked polymer used as the binder was used as shown in Tables 2 and 3, and the coating property and 90 ° peel strength were obtained. Evaluated. The results are shown in Tables 2 and 3. For Example 1-9 and Comparative Example 1-4, a 48% NaOH aqueous solution was added so that the degree of neutralization of the crosslinked polymer was 90 mol%. The amount corresponding to parts was used.
  • Examples 1-1 to 1-12 electrodes were prepared using the composition for a non-aqueous electrolyte secondary battery electrode mixture layer belonging to the present invention.
  • the coating property of each composition (slurry) is good, and the peel strength between the obtained mixture layer and the current collector (copper foil) is 1.0N / m or more. Excellent binding properties were exhibited.
  • Comparative Example 1-5 in which the amount of the cross-linked polymer with respect to the active material is small has almost no binding property of the mixture layer, and the mixture layer is not formed when the electrode is cut to prepare a sample for a peel test. Since it peeled off, the peel strength could not be measured.
  • Example 2-1 A lithium ion secondary battery was prepared using a mixture layer composition containing hard carbon as a negative electrode material, acetylene black as a conductive additive, and a crosslinked polymer R-1 as a binder, and the battery characteristics were evaluated.
  • the above mixture layer composition was coated on both sides with a coating width of 120 mm on a 20 ⁇ m thick copper foil (manufactured by Nippon Foil Co., Ltd.) as a current collector. After drying, roll press treatment was performed to prepare a negative electrode having a mixture layer on both sides of the current collector.
  • the adhesion amount of the mixture layer was 4.96 mg / cm 2 (for one side), and the density was 1.0 g / cm 3 .
  • NCM manufactured by Nippon Chemical Industry Co., Ltd.
  • HS-100 as a conductive additive
  • polyvinylidene fluoride trade name “KF # 1000”, manufactured by Kureha Co., Ltd.
  • the adhesion amount of the positive electrode mixture layer was 6.80 mg / cm 2 (for one side), and the density was 2.78 g / cm 3 .
  • Both the positive electrode and the negative electrode were vacuum-dried at 120 ° C. for 12 hours, and then the positive electrode was slit to a size of 96 ⁇ 84 mm and the negative electrode was 100 ⁇ 88 mm.
  • Examples 2-2 to 2-4 and Comparative Examples 2-1 to 2-4 A laminate cell was assembled by performing the same operation as in Example 2-1, except that the crosslinked polymer used as the binder was used as shown in Table 4, and the battery characteristics were evaluated. The results are shown in Table 4.
  • a 48% NaOH aqueous solution was added so that the degree of neutralization of the crosslinked polymer was 90 mol%, and the crosslinked polymer was an amount corresponding to 3 parts as a 90 mol% neutralized product. It was used.
  • SBR styrene butadiene rubber
  • CMC carboxymethyl cellulose
  • Examples 2-1 to 2-4 belong to the nonaqueous electrolyte secondary battery of the present invention, and the discharge capacity retention rate after the cycle test was as high as 93 to 95%, and the results of excellent cycle characteristics were obtained. .
  • each example showed good high rate characteristics. This is because the internal resistance of the battery is small because the interface resistance value is small due to the characteristics of the used crosslinked polymer, the uniform dispersibility of the active material and the conductive assistant is good, and the electronic resistance is small. This is presumed to be due to Among them, comparing Example 2-1 and Example 2-3 in which the amount of the crosslinked polymer used is the same, Example 2- using the crosslinked polymer R-6 having a high viscosity of 0.5 wt% aqueous dispersion No.
  • Comparative Examples 2-2 and 2-3 using the crosslinked polymers R-9 and R-11 in which the viscosity of the 0.5 wt% aqueous dispersion is outside the range specified in the present invention are as follows. 82% and 88%. Further, it can be seen that Comparative Example 2-3 and Comparative Example 2-4 using SBR and CMC as binders are inferior to the examples in terms of high rate characteristics. In Comparative Example 2-3, the active material and the conductive additive are not sufficiently dispersed, which is considered to be due to an increase in electronic resistance.
  • Comparative Example 2-4 it is presumed that the interface resistance increased because the binder did not have sufficient carboxyl groups, and as a result, the high-rate characteristics decreased. Similarly, Comparative Example 2-1 having a high content of the crosslinked polymer also had insufficient high rate characteristics.
  • the electrode obtained from the composition for a non-aqueous electrolyte secondary battery electrode mixture layer of the present invention has an excellent binding force and an effect of reducing battery resistance. For this reason, the nonaqueous electrolyte secondary battery provided with the electrode exhibits excellent high rate characteristics and durability (cycle characteristics), and is expected to be applied to a vehicle-mounted secondary battery.

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Abstract

L'invention concerne une composition pour une couche de mélange d'électrode d'une batterie secondaire à électrolyte non aqueux, ladite composition contenant un matériau actif, de l'eau et un liant. Le liant comprend : un polymère réticulé d'un composant monomère contenant un monomère d'acide carboxylique à insaturation éthylénique ; et un sel du polymère réticulé. La viscosité d'une dispersion aqueuse à 0,5 % en poids du polymère réticulé à un degré de neutralisation de 90 % en mole est de 5 000 à 40 000 mPa∙s. La teneur du polymère réticulé et de son sel est de 0,5 % à 5,0 % en poids par rapport au matériau actif.
PCT/JP2016/060098 2015-03-30 2016-03-29 Composition pour couche de mélange d'électrode de batterie secondaire à électrolyte non aqueux, procédé de production de ladite composition et utilisation de ladite composition WO2016158939A1 (fr)

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CN112421034A (zh) * 2019-08-22 2021-02-26 荒川化学工业株式会社 锂离子电池用粘合剂水溶液、锂离子电池负极用浆料、锂离子电池用负极及锂离子电池
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US11773246B2 (en) 2017-03-28 2023-10-03 Toagosei Co. Ltd. Binder for nonaqueous electrolyte secondary battery electrode
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