WO2022202958A1 - Composition polymère pour batterie secondaire non aqueuse et batterie secondaire non aqueuse - Google Patents

Composition polymère pour batterie secondaire non aqueuse et batterie secondaire non aqueuse Download PDF

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Publication number
WO2022202958A1
WO2022202958A1 PCT/JP2022/013823 JP2022013823W WO2022202958A1 WO 2022202958 A1 WO2022202958 A1 WO 2022202958A1 JP 2022013823 W JP2022013823 W JP 2022013823W WO 2022202958 A1 WO2022202958 A1 WO 2022202958A1
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mass
secondary battery
polymer
aqueous secondary
monomer
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PCT/JP2022/013823
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English (en)
Japanese (ja)
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きらら 小枝
和孝 竹野
匡志 岩本
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旭化成株式会社
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Publication of WO2022202958A1 publication Critical patent/WO2022202958A1/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
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/45—Heterocyclic compounds having sulfur in the ring
    • C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
    • 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
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/42—Acrylic resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/443—Particulate material
    • 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 relates to a polymer composition for non-aqueous secondary batteries and non-aqueous secondary batteries.
  • a liquid composition obtained by adding a binder, a thickening agent, etc. to an electrode active material is applied to the surface of a current collector.
  • Styrene-butadiene-based copolymer latex is known as a binder capable of forming an electrode layer having high adhesion to the metal constituting the current collector and having high flexibility.
  • the binder functions to improve the adhesion between the electrode layer containing the active material and the current collector or separator. may be inadequate. Insufficient adhesion tends to impair the charge-discharge cycle characteristics of the secondary battery.
  • Patent Document 1 proposes an electrode binder containing a predetermined polymer containing 2 to 25% by mass of a structural unit derived from an ethylenically unsaturated carboxylic acid and having a glass transition temperature adjusted to 25° C. or lower. It is Further, in Patent Document 2, a predetermined weight containing 20 to 70 parts by mass of repeating units derived from a conjugated diene compound and 10 to 50 parts by mass of repeating units derived from an unsaturated carboxylic acid and having specified physical properties related to the glass transition temperature Compositions for electrical storage devices have been proposed that contain coalescence.
  • the electrode binder described in Patent Document 1 it is described that an electrode having excellent active material coverage, a certain degree of flexibility, and good cycle characteristics when used in a battery can be obtained. Further, according to the composition for an electricity storage device described in Patent Document 2, it is described that an electricity storage device electrode having excellent flexibility, abrasion resistance, and powder-off resistance as well as exhibiting good charge-discharge durability characteristics can be obtained. .
  • the desired carboxylic acid content cannot be achieved, and as a result, the cycle characteristics are still insufficient.
  • the desired flexibility cannot be expressed, and as a result, electrode cracks may occur during winding during battery production, and cycle It turns out that the properties are still not sufficient.
  • the present invention has been made in view of the above-mentioned problems of the prior art, and as a result of expressing high flexibility that can suppress cracks and high peel strength after immersion in the electrolyte when used in non-aqueous secondary batteries.
  • An object of the present invention is to provide a polymer composition for non-aqueous secondary batteries that can exhibit high cycle characteristics.
  • a polymer particle comprising a polymer having units U1 derived from ethylenic monomer M1 and units U2 derived from (meth)acrylate monomer M2,
  • the ethylenic monomer M1 as a homopolymer has a glass transition temperature of ⁇ 15° C. or less ⁇ 50° C.
  • the (meth)acrylate monomer M2 as a homopolymer has a glass transition temperature of less than ⁇ 40° C.,
  • the content of the unit U1 is 1.0% by mass or more and 44% by mass or less, and the content of the unit U2 is 56% by mass or more, relative to 100% by mass of the total units constituting the polymer.
  • a polymer composition for a non-aqueous secondary battery which is 99% by mass or less.
  • the polymer composition for non-aqueous secondary batteries according to any one of [1] to [5], wherein the polymer particles have an average particle size of 150 nm or more.
  • the polymer further has a unit U3 derived from the ethylenic monomer M3, The ethylenic monomer M3 as a homopolymer has a glass transition temperature of ⁇ 15° C. or higher, and the ethylenic monomer M3 contains a polar functional group, The content of the unit U3 is 1% by mass or more and 43% by mass or less with respect to 100% by mass of all units constituting the polymer,
  • the non-aqueous two according to any one of [1] to [6] A polymer composition for secondary batteries.
  • the polar functional group possessed by the ethylenic monomer M1 and the polar functional group possessed by the ethylenic monomer M3 are from a carboxylic acid group, a hydroxy group, a sulfonic acid group, a phosphoric acid group, or the like, or an alkali metal salt thereof.
  • the content of the alkali metal salt G2 is 5.0 mol% or more and 95 mol% or less with respect to the total molar amount (100 mol%) of the carboxy group G1 and the alkali metal salt G2, [7] or [8]
  • [11] [1] A polymer composition for a non-aqueous secondary battery electrode binder, comprising the polymer composition for a non-aqueous secondary battery according to any one of [1] to [10].
  • a non-aqueous secondary battery comprising the polymer composition for a non-aqueous secondary battery according to any one of [1] to [11].
  • a polymer composition can be provided.
  • a polymer composition for a non-aqueous secondary battery according to one aspect of the present embodiment includes an ethylenic monomer M1 (hereinafter simply referred to as “monomer M1 ” or “M1”. (hereinafter also simply referred to as “U2”), including polymer particles.
  • the ethylenic monomer unit M1 as a homopolymer has a glass transition temperature of less than ⁇ 15° C. and ⁇ 50° C. or more, and the ethylenic monomer M1 has a polar functional group (hereinafter also referred to as “polar group”. ).
  • the glass transition temperature of the ethylenic monomer M2 as a homopolymer is less than -40°C.
  • the content of unit U1 is 1.0% by mass or more and 44% by mass or less, and the content of unit U2 is 56% by mass or more and 99% by mass, based on 100% by mass of all units constituting the polymer. It is below.
  • the strength is improved due to the high adhesiveness and flexibility mainly based on the unit U1 derived from the ethylenic monomer M1 having a polar functional group. , and cycle characteristics can be expressed.
  • the unit U1 can contribute as a soft component in the polymer particles because the glass transition temperature of the monomer M1 as a homopolymer is less than ⁇ 15° C. and ⁇ 50° C. or more.
  • the glass transition temperature of the ethylenic monomer M1 as a homopolymer is preferably ⁇ 17° C. or lower, more preferably ⁇ 20° C. or lower.
  • the glass transition temperature of the ethylenic monomer M1 as a homopolymer is preferably ⁇ 45° C. or higher, more preferably ⁇ 40° C. or higher.
  • the glass transition temperature can be calculated by the method described in Examples below. Further, the glass transition temperature can be adjusted within the above range by, for example, selecting a monomer having a relatively low SP value as the ethylenic monomer M1.
  • the unit U1 can contribute as an adhesion component in the polymer particles, since the ethylenic monomer M1 has a polar functional group.
  • the polar group possessed by the ethylenic monomer M1 is not particularly limited. mentioned.
  • the polar group is preferably a carboxylic acid group or an alkali metal salt thereof.
  • the ethylenic monomer M1 is not particularly limited, but for example, 2-acryloyloxyethyl succinic acid, 4-hydroxybutyl acrylate, ⁇ -carboxy-polycaprolactone (meth)acrylate, 3-sulfopropyl (meth)acrylate Acrylic acid esters such as potassium and 2-(meth)acryloyloxyethyl acid phosphate are included.
  • the ethylenic monomer M1 one of the above-exemplified ones may be used alone, or two or more thereof may be used in combination.
  • the ethylenic monomer M1 is preferably 2-acryloyloxyethyl succinic acid and 4-hydroxybutyl acrylate, more preferably 2-acryloyloxyethyl succinate, from the viewpoint of productivity and cost.
  • Ethyl succinate is preferably 2-acryloyloxyethyl succinic acid and 4-hydroxybutyl acrylate, more preferably 2-acryloyloxyethyl succinate, from the viewpoint of productivity and cost.
  • the unit U2 can contribute as a soft component in the polymer particles by having a glass transition temperature of less than ⁇ 40° C. as a homopolymer of the (meth)acrylate monomer M2.
  • the glass transition temperature of the (meth)acrylate monomer M2 as a homopolymer is preferably ⁇ 45° C. or lower, more preferably ⁇ 50° C. or lower.
  • the glass transition temperature can be calculated by the method described in Examples below. Further, the glass transition temperature can be adjusted within the above range by, for example, selecting a monomer having a relatively low SP value as the (meth)acrylate monomer M2.
  • the (meth)acrylate monomer M2 is not particularly limited, but examples include normal butyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and isodecyl (meth)acrylate. , lauryl (meth)acrylate, octadecyl (meth)acrylate, tetradecyl (meth)acrylate and other (meth)acrylic acid esters.
  • the (meth)acrylate monomer M2 one of the above-exemplified monomers may be used alone, or two or more thereof may be used in combination.
  • the (meth)acrylate monomer M2 is preferably 2-ethylhexyl (meth)acrylate and normal-butyl (meth)acrylate, more preferably 2- Ethylhexyl (meth)acrylate.
  • the polymer in the present embodiment further includes units U3 (hereinafter also simply referred to as "U3") derived from the ethylenic monomer M3 (hereinafter also simply referred to as "monomer M3" or “M3”).
  • U3 units U3 derived from the ethylenic monomer M3
  • M3 ethylenic monomer M3
  • the ethylenic monomer unit M3 as a homopolymer has a glass transition temperature of ⁇ 15° C. or higher, and the ethylenic monomer M3 has a polar functional group (polar group).
  • the polar group possessed by the ethylenic monomer M3 is not particularly limited, and examples thereof include a carboxylic acid group, a hydroxy group, a sulfonic acid group, phosphoric acid, and alkali metal salts thereof.
  • the polar group is preferably a carboxylic acid group or an alkali metal salt thereof. Since the unit U3 has a glass transition temperature of ⁇ 15° C. or higher as a homopolymer of the ethylenic monomer M3, it can contribute as a hard component and an adhesion component in the polymer particles. From the viewpoint of obtaining higher strength, the glass transition temperature of the ethylenic monomer M3 as a homopolymer is preferably 50° C.
  • the glass transition temperature can be measured by the method described in Examples below. Further, the glass transition temperature can be adjusted within the above range by, for example, selecting a monomer having a relatively high SP value as the ethylenic monomer M3.
  • the ethylenic monomer M3 is not particularly limited, but examples thereof include ethylenically unsaturated carboxylic acids such as itaconic acid, fumaric acid, hydroxyethyl (meth)acrylate, (meth)acrylic acid, and alkali metal salts thereof.
  • ethylenic monomer M3 one of the above examples may be used alone, or two or more thereof may be used in combination.
  • the ethylenic monomer M3 is preferably (meth)acrylic acid or an alkali metal salt thereof, more preferably methacrylic acid or an alkali metal salt thereof, from the viewpoint of productivity and the like.
  • the polymer may further have a unit U4 (hereinafter also simply referred to as "U4") other than the units U1, U2 and U3.
  • U4 a unit U4 (hereinafter also simply referred to as "U4") other than the units U1, U2 and U3.
  • optional unit U4 include, but are not limited to, aromatic vinyl monomers such as styrene and vinylnaphthalene, nitrile group-containing monomers such as (meth)acrylonitrile, sulfones such as vinylsulfonic acid, Acid group-containing monomers, aromatic divinyl monomers such as divinylbenzene, acrylic acid ester monomers such as methyl (meth)acrylate, ethyl (meth)acrylate, and butyl methacrylate Ethylene glycol di(meth)acrylate, propylene glycol alkylene glycol di(meth)acrylates such as di(meth)acrylate 1,4-butanediol di(meth)acryl
  • the content of unit U1 is 1.0% by mass or more and 44% by mass or less, and the content of unit U2 is 56% by mass or more and 99% by mass, based on 100% by mass of all units constituting the polymer. It is below. While the unit U1 that contributes as a soft component and adhesion component is an essential component, the polymer particles can achieve both high strength and flexibility by containing a certain amount of units U2 that contribute as a soft component. can. From the viewpoint of achieving both high strength and flexibility, the content of the unit U1 is preferably 3.0% by mass or more and 43% by mass or less, more preferably 5.0% by mass or more and 40% by mass or less.
  • the content of U1 is less than 1%, flexibility is impaired, and if it exceeds 44%, aggregation occurs during polymerization.
  • the content of the unit U2 is preferably 56.5% by mass or more and 95% by mass or less, more preferably 57% by mass or more and 90% by mass or less. If the U2 content is less than 56%, the flexibility and electrolyte resistance are impaired, and if it exceeds 99%, the strength is reduced.
  • the content of the unit U3 is not particularly limited to 100% by mass of the total units constituting the polymer, but is preferably 1% by mass or more and 43% by mass or less.
  • each unit can also be specified by analyzing the polymer particles by a conventional method.
  • the number of polar functional groups of the polymer particles is preferably 1.0 ⁇ 10 21 or more. When the number of polar functional groups is 1.0 ⁇ 10 21 or more, high strength tends to be obtained. The number of polar functional groups is more preferably 1.5 ⁇ 10 21 or more, still more preferably 1.8 ⁇ 10 21 or more. The upper limit of the number of polar functional groups is not particularly limited. When the number of polar functional groups is 1.0 ⁇ 10 21 or more, the peel strength before and after immersion in the electrolytic solution is improved. The number of polar functional groups can be determined by the method described in Examples below.
  • the Young's modulus can be adjusted within the above range by, for example, using the types of the above-mentioned preferred monomers as the constituent components of the polymer, or by including the preferred amount as the content of each unit.
  • the Young's modulus of the polymer particles is measured from the dry coating and is preferably 1000 MPa or less.
  • a Young's modulus of 1000 MPa or less tends to provide high flexibility.
  • Young's modulus is more preferably 900 MPa or less, and still more preferably 800 MPa or less.
  • the lower limit of Young's modulus is not particularly limited.
  • the Young's modulus of the polymer particles is 1000 MPa or less, the peel strength before and after immersion in the electrolytic solution is improved. From the viewpoint of strength, the Young's modulus is preferably 10 or more.
  • the Young's modulus can be measured by the method described in Examples below.
  • the Young's modulus can be adjusted within the above range by, for example, using the types of the above-mentioned preferred monomers as the constituent components of the polymer, or by including the preferred amount as the content of each unit.
  • the insoluble content of the polymer particles in the electrolytic solution (hereinafter also referred to as “electrolytic solution-insoluble content”) is preferably 0.90 times or more.
  • the electrolyte-insoluble matter is an index for evaluating the dissolution of the polymer particles into the electrolyte, and when the value is 0.90 times or more, side reactions other than the battery reaction can be suppressed in the electrolyte. , the adhesive strength tends to be maintained even in the electrolytic solution.
  • the electrolyte insoluble content is more preferably 0.92 times or more, still more preferably 0.94 times or more, and even more preferably 0.96 times or more.
  • the upper limit of the electrolyte insoluble content is not particularly limited.
  • the electrolyte-insoluble matter is 0.9 times or more, the peel strength of the electrode after immersion in the electrolyte is improved.
  • the electrolyte-insoluble matter can be measured by the method described in Examples below.
  • the electrolyte-insoluble matter is adjusted to the above range by using the above-described preferred monomer types as the constituent components of the polymer particles, or by including an amount that is considered preferable as the content of each unit. can.
  • the degree of swelling of the polymer particles with respect to the electrolytic solution is preferably less than 2.5 times.
  • the degree of swelling of the electrolyte solution is an index for evaluating the resistance of the polymer particles to the electrolyte solution. It tends to stay strong.
  • the degree of swelling is more preferably 2.3 times or less, still more preferably less than 2.0 times, still more preferably 1.9 times or less, still more preferably 1.5 times or less, and most preferably 1.3 times. less than double.
  • the lower limit of the degree of swelling of the electrolytic solution is not particularly limited.
  • the degree of swelling of the electrolytic solution can be measured by the method described in Examples below.
  • the degree of swelling of the electrolytic solution is adjusted to the above range by using the above-described preferred types of monomers as the constituent components of the polymer particles, or by including the preferred amount as the content of each unit. can.
  • both the electrolyte-insoluble matter and the electrolyte-swelling degree of the polymer particles satisfy the numerical ranges described above.
  • the method for adjusting the values of the electrolyte-insoluble matter and the electrolyte-swelling degree of the polymer particles in the present embodiment to the numerical ranges described above is not limited to the methods described above.
  • the SP value means the cohesive energy density (E) of various atomic groups and the molar molecule
  • E the cohesive energy density of various atomic groups
  • V the volume of the solubility parameter
  • the SP value of a typical electrolytic solution is not limited to the following, but is about 11, for example.
  • a monomer component with an SP value exceeding 11 can be treated as a high SP value component, and a monomer component with an SP value of less than 11 can be treated as a low SP value component.
  • the ethylenic monomer M1 usually tends to have a high SP value.
  • the SP value of the homopolymer composed of the ethylenic monomer M1 is not limited to the following, but is 10.0 to 13.0. is preferably Moreover, the ethylenic monomer M2 usually tends to have a low SP value.
  • the SP value of the ethylenic monomer M2 is not limited to the following, it is preferably 8.0 to 10.0.
  • the SP value of the ethylenic monomer M2 is within the above range, it is possible to suppress the degree of swelling of the electrolytic solution to a low level.
  • the ethylenic monomer M3 usually tends to have a high SP value.
  • the SP value of the ethylenic monomer M3 is not limited to the following, it is preferably 10.0 to 17.0.
  • the content of the former is 56% by mass or more and less than 99%
  • the SP value of the ethylenic monomer M2 is in the above range, so that the peel strength can be maintained even after immersion in the electrolyte, and the latter is 1% or more and 44% by mass. %, the peel strength after immersion in the electrolytic solution can be maintained, which is preferable.
  • the average particle size of the polymer particles in the present embodiment is preferably 150 nm or more from the viewpoint of suppressing migration of the binder during drying after application of the coating liquid for the secondary battery negative electrode and not decreasing the peel strength of the electrode. It is preferably 200 nm or more, more preferably 250 nm or more, still more preferably 300 nm or more, 350 nm or more, or 400 nm or more. This improves the peel strength of the electrode before and after immersion in the electrolyte. Moreover, the average particle diameter of the polymer particles in the present embodiment is preferably 2000 nm or less from the viewpoint of suppressing sedimentation of the binder.
  • the above-mentioned average particle diameter can be measured by the method described in Examples below, and is adjusted within the above range by adjusting the composition ratio of each unit derived from the monomer of the polymer particles, the polymerization temperature, the emulsifier, etc. can.
  • the composition of the present embodiment can contain various known optional components in addition to the polymer particles of the present embodiment, depending on its use.
  • the application of the composition of the present embodiment is not particularly limited as long as it is used as one material for non-aqueous secondary batteries, and it can be used as a negative electrode material, a positive electrode material, a separator material, and the like. , it is particularly preferable to use it as a negative electrode material.
  • composition for manufacturing a battery material when used for manufacturing a negative electrode, a positive electrode, or a separator, it is particularly referred to as "a composition for manufacturing a battery material.”
  • the composition for producing a battery material when a negative electrode is produced using the composition for producing a battery material, the composition for producing a battery material may contain the polymer particles of the present embodiment, a negative electrode active material, and optionally optional components. can.
  • the composition for producing a battery material may contain the polymer particles of the present embodiment, a positive electrode active material, and optionally optional components. .
  • the composition for producing a battery material may contain the polymer particles of the present embodiment, a separator raw material, and optional components as necessary.
  • the composition of the present embodiment does not contain any of the negative electrode active material, positive electrode active material, and separator raw material, it can be applied as an additive for manufacturing battery materials. That is, when the composition of the present embodiment is used as a binder, it is referred to as a "binder composition", and when it is used as a thickener, it is referred to as a "thickener composition”.
  • composition of the present embodiment can be said to include “battery material manufacturing composition”, “binder composition” and “thickener composition”. All of the applications are common in that the polymer particles of the present embodiment are contained. Moreover, in any application, when the composition of the present embodiment contains an optional component, the type and mixing ratio thereof are not particularly limited, and may be appropriately determined according to the application.
  • the negative electrode active material that can be used is not particularly limited, but examples thereof include carbon-based active materials and silicone-based active materials.
  • carbon-based active materials include, but are not limited to, graphite, carbon fiber, coke, hard carbon, mesocarbon microbeads (MCMB), furfuryl alcohol resin sintered body (PFA), conductive polymer (poly-p -phenylene, etc.).
  • silicone-based active material include, but are not limited to, silicon, SiO x (0.01 ⁇ x ⁇ 2), alloys of silicon and transition metals, and the like.
  • the positive electrode active material that can be used is not particularly limited, but examples include lithium-containing composite oxides, transition metal oxides, transition metal fluorides, transition metal sulfides, and the like. mentioned.
  • lithium-containing composite oxides include, but are not limited to, LiCoO 2 , LiMnO 2 , LiNiO 2 , LiMn 2 O 4 , LiXCoYSnZO 2 , LiFePO 4 , and LiXCoYSnZO 2 .
  • transition metal oxides include, but are not limited to, MnO 2 , MoO 3 , V 2 O 5 , V 6 O 13 , Fe 2 O 3 and Fe 3 O 4 .
  • transition metal fluorides include, but are not particularly limited to, CuF 2 and NiF 2 .
  • transition metal sulfides include, but are not particularly limited to, TiS 2 , TiS 3 , MoS 3 , FeS 2 and the like.
  • the unit U1 and / or the unit U3 is a carboxyl group G1 derived from the monomer M1 and / or the monomer M3 (hereinafter also simply referred to as "G1") and its It can have an alkali metal salt G2 (hereinafter also simply referred to as "G2").
  • G1 carboxyl group G1 derived from the monomer M1 and / or the monomer M3
  • G2 alkali metal salt
  • the unit U1 and the unit U3 each have a carboxyl group G1 and its alkali metal salt G2
  • the content of G2 is 5.0 mol% or more and 95 mol% with respect to 100 mol% of the total molar amount of G1 and G2. The following are preferable.
  • the monomers M1 and M3 at least a part of the above-described polar functional group-containing monomer may be contained in the monomer unit of the water-soluble molecule in the form of a neutralized alkali metal salt.
  • the content of G2 is more preferably 5 to 75 mol%, still more preferably 5 to 70 mol%, and even more preferably 5 to 65%.
  • Alkali metal salts are not particularly limited, but include, for example, lithium salts, potassium salts, sodium salts, etc., with sodium salts being preferred.
  • the composition of the present embodiment when used as a binder composition, the polymer particles of the present embodiment and 0.0001 parts by mass or more and 1.0 parts by mass or less with respect to 100 parts by mass of the polymer particles and an isothiazoline-based compound.
  • the isothiazoline-based compound is not particularly limited, and various known compounds can be employed.
  • the binder composition of the present embodiment can contain an antifoaming agent as an optional component.
  • antifoaming agents include mineral oil-based, silicone-based, acrylic-based, and polyether-based various antifoaming agents. When it contains an antifoaming agent, it tends to be more excellent in defoaming properties.
  • the type and mixing ratio of the optional component are not particularly limited.
  • the method for producing the composition of the present embodiment is not particularly limited, but the following production method (hereinafter also referred to as "the production method of the present embodiment") can be preferably used. That is, in order to obtain a composition containing polymer particles, a method of carrying out emulsion polymerization using the raw material monomers and the like described above is preferable. Appropriate seed particles can be used during polymerization, and the seed particles can also be obtained by ordinary emulsion polymerization.
  • a known method can be employed for the emulsion polymerization, and it can be produced by appropriately using a polymerization initiator, a molecular weight adjuster, a chelating agent, a pH adjuster, an emulsifier, etc. in an aqueous medium.
  • the emulsifier is not particularly limited, but for example, anionic surfactants, nonionic surfactants, amphoteric surfactants, reactive surfactants, etc. can be used alone or in combination of two or more.
  • anionic surfactants include, but are not limited to, higher alcohol sulfate esters, alkylbenzene sulfonates, aliphatic sulfonates, polyethylene glycol alkyl ether sulfate esters, and the like.
  • nonionic surfactant is not particularly limited, for example, polyethylene glycol alkyl ester type, alkyl ether type, alkylphenyl ether type and the like are used.
  • amphoteric surfactant is not particularly limited, but examples thereof include betaines such as lauryl betaine and stearyl betaine, amino acid types such as lauryl- ⁇ -alanine, stearyl- ⁇ -alanine, and lauryl di(aminoethyl)glycine. Used.
  • reactive surfactants include, but are not limited to, polyoxyethylene alkylpropenylphenyl ether, ⁇ -[1-[(allyloxy)methyl]-2-(nonylphenoxy)ethyl]- ⁇ -hydroxypolyoxyethylene etc.
  • the polymerization initiator is not particularly limited, but for example, water-soluble polymerization initiators such as sodium persulfate, potassium persulfate and ammonium persulfate; A combination of redox polymerization initiators and the like can be used alone or in combination.
  • conditions such as stirring speed, polymerization temperature, reaction (polymerization) time, etc. are not particularly limited as long as the composition of the present embodiment can be obtained.
  • the stirring speed can be usually 50 rpm or more and 500 rpm or less
  • the polymerization temperature can be usually 50° C. or more and 100° C. or less
  • the reaction time can be usually 3 hours or more and 72 hours or less.
  • the polymer particles are dispersed in a dispersion medium and optional components are added to obtain the composition of the present embodiment. can be obtained.
  • Water can be used as the dispersion medium, and an organic solvent suitable for the active material can also be used as necessary.
  • the non-aqueous secondary battery of this embodiment can be manufactured using the composition of this embodiment.
  • the non-aqueous secondary battery of this embodiment contains the composition of this embodiment.
  • typical constituent members thereof include a negative electrode, a negative electrode current collector, a positive electrode, a positive electrode current collector, a separator, and an electrolytic solution.
  • at least one of its main members is obtained using the composition of the present embodiment, that is, at least one of the main members is , as long as it contains the composition of the present embodiment.
  • each member contains the composition of the present embodiment can be specified by whether or not the member contains the polymer particles of the present embodiment.
  • the method for producing the non-aqueous secondary battery of the present embodiment is not particularly limited, but taking a lithium ion secondary battery as an example, the composition of the present embodiment is applied to a current collector, heated, and dried.
  • the positive and negative electrodes are opposed to each other with a separator interposed therebetween, and an electrolytic solution is injected and sealed.
  • the negative electrode current collector is not particularly limited, but for example, copper foil is used, and the positive electrode current collector is not particularly limited, but for example, aluminum foil is used.
  • the electrolytic solution is not particularly limited, but for example, a solution obtained by dissolving an electrolyte such as LiClO 4 , LiBF 4 , or LiPF 6 in an organic solvent can be used.
  • organic solvents include, but are not limited to, ethers, ketones, lactones, nitriles, amines, amides, carbonates, chlorinated hydrocarbons, etc.
  • Representative examples include tetrahydrofuran and acetonitrile. , butyronitrile, propylene carbonate, ethylene carbonate, diethyl carbonate, etc., which are used singly or as a mixture of two or more.
  • the coating method is not particularly limited, but any coater head such as a reverse roll coater, comma bar coater, gravure coater, and air knife coater can be used.
  • the drying method is also not particularly limited, and for example, standing drying, air drying, hot air drying, infrared heating, far infrared heating, etc. can be used.
  • the drying temperature is not particularly limited, it can be performed at, for example, 60°C to 150°C.
  • composition and “coating liquid”, but both concepts are included in the composition of the present embodiment.
  • Example 1 0.2 parts by mass of polyoxyethylene polycyclic phenyl ether/sulfate ammonium salt (Nippon Nyukazai Co., Ltd., trade name "Newcol 707-SF”) and 750 parts by mass of ion-exchanged water were added to the reactor, and the mixture was stirred to 70 parts by mass. The temperature was raised to °C and held. To this, 1.0 part by mass of sodium persulfate (hereinafter also referred to as "NPS”) was added.
  • NPS sodium persulfate
  • MAES 2-acryloyloxyethyl succinic acid
  • 2-EHA 2-ethylhexyl acrylate
  • methacrylic acid hereinafter referred to as 1.0 parts by mass of a monomer solution obtained by mixing 50 parts by mass of "MAA” and polyoxyethylene polycyclic phenyl ether sulfate ammonium salt (Nippon Nyukazai Co., Ltd. trade name "Newcol 707-SF) and 300 parts by mass of ion-exchanged water were added.
  • the resulting mixture was emulsified with a homogenizer and the obtained emulsion was added dropwise, and the dropwise addition was completed in 2.5 hours while the temperature was kept at 70° C. After that, the polymerization was continued for 2 hours. After that, the temperature was raised from 70° C. to 80° C. and held for 1.5 hours to complete the polymerization.
  • the blending amount of each monomer component is 13% by mass for MAES and 62% by mass for 2-EHA relative to 100% by mass of the total amount of monomer components (MAES, 2-EHA and MAA).
  • MAA was 25 mass %.
  • filtration was performed using a 200 ⁇ m mesh.
  • the polymerization rate was 99%.
  • An aqueous solution prepared by dissolving 63.0 parts by mass of a 10% aqueous sodium hydroxide solution in 347.8 parts by mass of ion-exchanged water was added to the obtained polymer particles to neutralize them, thereby obtaining a composition.
  • the resulting composition had a pH of 7 and a solids content of 10%.
  • the polymerization rate was calculated by adding the solid content to the ratio of the amount of residue to the amount of all ingredients charged.
  • ⁇ Preparation of coating liquid for secondary battery negative electrode> To 1.5 parts by mass of the composition obtained as a solid content, 1.0 parts by mass of carboxymethyl cellulose as a thickener component and 100 parts by mass of natural graphite as a negative electrode active material are added. Exchanged water was added and stirred with a mechanical stirrer to adjust the total solid content to 60%. This is used as a premix, and then dispersed for 30 seconds at a peripheral speed of 20 m / sec using a thin film swirling high-speed mixer (PRIMIX, product name "TK Filmix FM56-L type”), and the secondary battery This was used as a coating liquid for the negative electrode.
  • PRIMIX product name "TK Filmix FM56-L type
  • the above coating solution was applied to one side of a copper foil with a die coater so that the thickness after drying was 100 ⁇ m, and then dried at 60° C. for 60 minutes. After drying at 120° C. for 3 minutes, compression molding was performed using a roll press.
  • the negative electrode active material coating amount was 106 g/m 2 and the negative electrode active material bulk density was 1.35 g/cm 3 .
  • Examples 2 to 11 and Comparative Examples 1 to 5 were performed in the same manner as in Example 1, except that the types and/or blending amounts of the monomers and additives were changed as shown in the table below. was prepared to prepare a secondary battery negative electrode. Further, monomers other than the monomers used in Example 1 were also added at the same time as the monomers used in Example 1.
  • the mass display of each monomer component in the above table indicates the amount of the monomer compounded as mass% with respect to the total amount of the monomer components of 100 mass%. However, methylisothiazoline is shown in parts by mass actually used.
  • MAES 2-acryloyloxyethyl succinic acid 4HBA: 4-hydroxybutyl acrylate
  • 2-EHA 2-ethylhexyl acrylate
  • BA butyl acrylate
  • MAA methacrylic acid AA: acrylic acid 1,9-ND: 1,9 nonanediol dimethacrylate
  • EA ethyl acrylate
  • HEMA 2-hydroxyethyl methacrylate
  • DVB divinylbenzene
  • the number of polar functional groups per 1 g of polymer particles is determined by dividing the contents of the monomer M1 and the monomer M3 per 1 g of the polymer particles specified by analyzing the polymer particles by a conventional method into the monomer M1 and the monomer It was calculated by dividing by the molecular weight of the compound M3, multiplying Avogadro's number by the acid value, and adding them together.
  • the composition containing the polymer particles was left to dry in an oven at 130° C. for 1 hour.
  • the average particle size of the polymer particles was measured using a particle size measuring device (manufactured by Otsuka Electronics Co., Ltd., FPAR-1000).
  • the measurement conditions were light intensity of 10,000 to 50,000 cps and measurement time of 180 seconds, and the average particle diameter (nm) was determined by cumulant analysis of the obtained data.
  • Glass transition temperature: Tg Glass transition temperature
  • crack A composition containing polymer particles was adjusted to have a solid content of 10% and a pH of 7.0, and 100 g of the composition was poured into a SUS container of length 10 cm ⁇ width 10 cm ⁇ height 7 cm. This was dried at 45° C. for 36 hours, then dried at 85° C. for 12 hours, and then dried at 115° C. for 2 hours to obtain a film. It was visually evaluated whether cracks had occurred in this film. It can be evaluated that the more flexible the film does not crack, the less likely it is that electrode cracks will occur during winding during battery production. Specifically, cracks were evaluated based on the following criteria. It is preferable that the crack is ⁇ or more. More preferably, it is (double-circle). ⁇ : No cracks ⁇ : 1 or more but less than 3 cracks ⁇ : 3 or more but less than 5 cracks ⁇ : 5 or more cracks
  • peel strength A test piece having a width of 2 cm and a length of 12 cm was cut out from the obtained secondary battery negative electrode, and the surface of the test piece on the collector side was attached to an aluminum plate with a double-sided tape.
  • a tape with a width of 18 mm (trade name “Cellotape (registered trademark)” (manufactured by Nichiban Co., Ltd.)) was attached to the electrode layer side of the test piece, and the tape was applied in a 180 ° direction at a speed of 100 mm / min.
  • the peel strength was measured six times, and the average value (N/18 mm) was calculated as the peel strength (before immersion in the electrolytic solution).
  • ⁇ is more preferable, and ⁇ is even more preferable.
  • a secondary battery using a secondary battery negative electrode and manufactured by the following method is charged at a constant current of 2C at 60° C. by a constant current and constant voltage charging method until it reaches 4.2 V, and then a constant voltage. and then discharged to 3.0V at a constant current of 2C.
  • the cycle test was performed up to 100 cycles, and the ratio of the discharge capacity at the 100th cycle to the initial discharge capacity was defined as the capacity retention rate, which was evaluated according to the following criteria. The larger this value, the smaller the decrease in capacity due to repeated charging and discharging.
  • Cycle characteristics are preferably ⁇ or higher. ⁇ is more preferable, and ⁇ is even more preferable.
  • Capacity retention rate is 90% or more ⁇ : Capacity retention rate is 80% or more and less than 90% ⁇ : Capacity retention rate is 70% or more and less than 80% ⁇ : Capacity retention rate is less than 70%
  • a positive electrode and a negative electrode of a secondary battery were punched into circular shapes, and the positive electrode, separator, and negative electrode were laminated in this order so that the active material surfaces of the positive electrode and the negative electrode faced each other, and then housed in a stainless steel container with a lid.
  • the container and the lid were insulated, and the container was placed in contact with the copper foil of the negative electrode, and the lid was placed in contact with the aluminum foil of the positive electrode. Then, an electrolytic solution was poured into the container, the container was sealed, and the container was left at room temperature for one day to produce a secondary battery.
  • the separator was made of a polyethylene porous film, and the secondary battery negative electrode obtained in Examples 1 to 6 and Comparative Examples 1 to 4 was used.
  • the secondary battery positive electrode one manufactured as follows was used. 92.2% by mass of lithium cobalt composite oxide (LiCoO 2 ) as a positive electrode active material, 2.3% by mass each of flaky graphite and acetylene black as a conductive material, and 3.2% by mass of polyvinylidene fluoride (PVDF) as a binder.
  • LiCoO 2 lithium cobalt composite oxide
  • PVDF polyvinylidene fluoride
  • NMP N-methylpyrrolidone

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Abstract

L'invention concerne une composition polymère pour batterie secondaire non aqueuse comprenant des particules polymères qui contiennent un polymère qui possède un motif U1 dérivé d'un monomère du type éthylène M1 et un motif U2 dérivé d'un monomère du type (méth)acrylate M2, la température de transition vitreuse d'un homopolymère du monomère du type éthylène M1 étant inférieure à -15 °C mais supérieure ou égale à -50 °C ; le monomère du type éthylène M1 contenant un groupe fonctionnel polaire ; la température de transition vitreuse d'un homopolymère du monomère du type (méth)acrylate M2 étant inférieure à -40 °C ; la teneur en motif U1 par rapport à 100 % en masse de tous les motifs constituant le polymère allant de 1,0 à 44 % en masse ; et la teneur en motif U2 allant de 56 à 99 % en masse.
PCT/JP2022/013823 2021-03-24 2022-03-24 Composition polymère pour batterie secondaire non aqueuse et batterie secondaire non aqueuse WO2022202958A1 (fr)

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WO2012002451A1 (fr) * 2010-06-29 2012-01-05 日本ゼオン株式会社 Composition de liant aqueux pour électrode négative de batterie rechargeable
WO2012029839A1 (fr) * 2010-09-01 2012-03-08 日本ゼオン株式会社 Composition liante aqueuse pour cathode de batterie secondaire, composition pâteuse pour cathode de batterie secondaire, cathode de batterie secondaire et batterie secondaire
WO2013133167A1 (fr) * 2012-03-09 2013-09-12 日東電工株式会社 Ruban adhésif
KR20160064025A (ko) * 2014-11-27 2016-06-07 주식회사 엘지화학 우수한 성능을 갖는 바인더 조성물 및 이를 포함하는 이차전지
JP2016201238A (ja) * 2015-04-09 2016-12-01 東洋インキＳｃホールディングス株式会社 蓄電デバイス用包装材料
JP2017526104A (ja) * 2014-07-11 2017-09-07 エルジー・ケム・リミテッド 正極およびその製造方法
WO2019230592A1 (fr) * 2018-05-31 2019-12-05 富士フイルム株式会社 Collecteur de courant ayant une couche d'adhérence facile, électrode, batterie secondaire tout solide, dispositif électronique, véhicule électrique, et procédés de fabrication de collecteur de courant ayant une couche d'adhérence facile, d'électrode et de batterie secondaire tout solide
WO2021039468A1 (fr) * 2019-08-30 2021-03-04 富士フイルム株式会社 Composition contenant un électrolyte solide inorganique, feuille pour batteries secondaires entièrement solides, batterie secondaire entièrement solide, méthode de fabrication de feuille pour batteries secondaires entièrement solides, et méthode de fabrication de batterie secondaire entièrement solide

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012002451A1 (fr) * 2010-06-29 2012-01-05 日本ゼオン株式会社 Composition de liant aqueux pour électrode négative de batterie rechargeable
WO2012029839A1 (fr) * 2010-09-01 2012-03-08 日本ゼオン株式会社 Composition liante aqueuse pour cathode de batterie secondaire, composition pâteuse pour cathode de batterie secondaire, cathode de batterie secondaire et batterie secondaire
WO2013133167A1 (fr) * 2012-03-09 2013-09-12 日東電工株式会社 Ruban adhésif
JP2017526104A (ja) * 2014-07-11 2017-09-07 エルジー・ケム・リミテッド 正極およびその製造方法
KR20160064025A (ko) * 2014-11-27 2016-06-07 주식회사 엘지화학 우수한 성능을 갖는 바인더 조성물 및 이를 포함하는 이차전지
JP2016201238A (ja) * 2015-04-09 2016-12-01 東洋インキＳｃホールディングス株式会社 蓄電デバイス用包装材料
WO2019230592A1 (fr) * 2018-05-31 2019-12-05 富士フイルム株式会社 Collecteur de courant ayant une couche d'adhérence facile, électrode, batterie secondaire tout solide, dispositif électronique, véhicule électrique, et procédés de fabrication de collecteur de courant ayant une couche d'adhérence facile, d'électrode et de batterie secondaire tout solide
WO2021039468A1 (fr) * 2019-08-30 2021-03-04 富士フイルム株式会社 Composition contenant un électrolyte solide inorganique, feuille pour batteries secondaires entièrement solides, batterie secondaire entièrement solide, méthode de fabrication de feuille pour batteries secondaires entièrement solides, et méthode de fabrication de batterie secondaire entièrement solide

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