WO2022138322A1 - Liant de séparateur pour batterie secondaire non aqueuse, séparateur pour batterie secondaire non aqueuse, procédé de production de bouillie de séparateur pour batterie secondaire non aqueuse et batterie secondaire non aqueuse - Google Patents

Liant de séparateur pour batterie secondaire non aqueuse, séparateur pour batterie secondaire non aqueuse, procédé de production de bouillie de séparateur pour batterie secondaire non aqueuse et batterie secondaire non aqueuse Download PDF

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Publication number
WO2022138322A1
WO2022138322A1 PCT/JP2021/046014 JP2021046014W WO2022138322A1 WO 2022138322 A1 WO2022138322 A1 WO 2022138322A1 JP 2021046014 W JP2021046014 W JP 2021046014W WO 2022138322 A1 WO2022138322 A1 WO 2022138322A1
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Prior art keywords
polymer
separator
secondary battery
aqueous secondary
structural unit
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PCT/JP2021/046014
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English (en)
Japanese (ja)
Inventor
健太郎 高橋
充 花▲崎▼
智規 倉田
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昭和電工株式会社
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Priority to JP2022572189A priority Critical patent/JPWO2022138322A1/ja
Priority to KR1020237020006A priority patent/KR20230124572A/ko
Priority to CN202180084547.2A priority patent/CN116601193A/zh
Publication of WO2022138322A1 publication Critical patent/WO2022138322A1/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
    • C08F220/52—Amides or imides
    • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/56—Acrylamide; Methacrylamide
    • 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
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • 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
    • C08L33/24—Homopolymers or copolymers of amides or imides
    • C08L33/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • 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
    • H01M50/403—Manufacturing processes of separators, membranes or diaphragms
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a separator binder for a non-aqueous secondary battery, a separator for a non-aqueous secondary battery, a method for producing a separator slurry for a non-aqueous secondary battery, and a non-aqueous secondary battery.
  • a lithium ion secondary battery is a secondary battery in which lithium ions move between a positive electrode and a negative electrode to charge and discharge the battery.
  • the main components of the lithium ion secondary battery are a positive electrode in which a positive electrode active material layer containing a metal oxide such as lithium cobaltate is formed on the surface of a current collector such as aluminum, and graphite or the like on the surface of the current collector such as copper. It contains a negative electrode on which a negative electrode active material layer containing the above-mentioned material is formed, a separator provided between the positive electrode and the negative electrode, and an electrolytic solution in which an electrolyte such as a lithium salt is dissolved in a solvent such as carbonate.
  • the separator is a member provided to isolate between the positive electrode and the negative electrode, and a base material such as a resin porous membrane is widely used as a separator in non-aqueous secondary batteries.
  • a base material such as a resin porous membrane is widely used as a separator in non-aqueous secondary batteries.
  • the holes in the separator are closed, preventing the movement of carrier ions and shutting down the battery.
  • the energy density of secondary batteries has been increasing, and the amount of heat generated by the batteries during use tends to increase. Therefore, in order to impart heat resistance to the separator, it has been proposed to form a coating layer containing a binder and non-conductive particles on at least one surface of the base material.
  • the coating layer generally contains organic or inorganic particles (fillers) and a binder for fixing the particles on the surface of the substrate.
  • Patent Document 1 describes applying a mixture containing alumina staple fibers, polyvinylidene fluoride, and N-methylpyrrolidone to a porous polypropylene sheet.
  • Patent Document 2 describes a separator for a non-aqueous electrolytic solution secondary battery in which a porous membrane of a water-soluble polymer and a porous membrane of a polyolefin are laminated, and examples of the water-soluble polymer include polyvinyl alcohol and carboxymethyl cellulose (CMC). Is described. In the examples, it is described that a slurry containing CMC and alumina fine particles is applied onto a porous film to prepare a separator.
  • CMC carboxymethyl cellulose
  • Patent Document 3 describes a multilayer porous membrane provided with a porous layer composed of an inorganic filler and polyvinyl alcohol having a saponification degree of 85% or more on at least one surface of the polyolefin resin porous membrane.
  • Patent Document 4 describes a resin composition for a binder containing a water-soluble polymer having a metal carboxylate group and a water-soluble polymer having a hydroxyl group, a carboxy group or a sulfo group, as a separator for a non-aqueous electrolyte secondary battery. It is described that it is used to bind filler particles to the surface of a substrate. Examples describe an example in which carboxymethyl cellulose and polyvinyl alcohol are used in combination as a binder and water is used as a solvent.
  • Japanese Patent No. 3756815 Japanese Unexamined Patent Publication No. 2004-227972 Japanese Unexamined Patent Publication No. 2008-186721 International Publication No. 2013/154197
  • the CMC resin is inferior in dispersibility of the inorganic filler, tends to be a highly viscous slurry, and tends to deteriorate in coatability. Further, the slurry using them is inferior in wettability to the polyolefin porous film. The heat resistance of the obtained separator is also insufficient. Further, since the layer obtained by drying the slurry is inferior in adhesion to the polyolefin porous film, the produced laminated porous separator is liable to cause powder falling off.
  • Patent Document 3 the dimensional stability of the porous layer at high temperature is insufficient.
  • the slurry containing the CMC resin has a high viscosity and is inferior in coatability.
  • the present invention it is possible to produce a slurry having good wettability to a substrate and good coatability, it is possible to form a coating layer having high peel strength on a separator, and it is possible to suppress thermal shrinkage of the separator. It is an object of the present invention to provide a separator binder for a non-aqueous secondary battery and a separator binder composition for a non-aqueous secondary battery. Another object of the present invention is to provide a separator for a non-aqueous secondary battery, which is provided with a coating layer having a high peel strength against a substrate and has a small heat shrinkage.
  • the polymer (B) is polyvinyl alcohol having a saponification degree of 55 mol% or more.
  • the value of the mass ratio of the content of the first structural unit (a1) to the content of the second structural unit (a2) in the polymer (A) is 55.0 / 45.0 or more and 95.0. It is /5.0 or less, and the value of the mass ratio of the content of the polymer (A) to the content of the polymer (B) is 55.0 / 45.0 or more and 97.0 / 3.0.
  • the following separator binder for non-aqueous secondary batteries [2] The separator binder for a non-aqueous secondary battery according to [1], which comprises only the polymer (A) and the polymer (B).
  • the total content of the first structural unit (a1) and the second structural unit (a2) in the polymer (A) is 80% by mass or more, any of [1] to [5].
  • the above-mentioned separator binder for non-aqueous secondary batteries [7] The non-aqueous secondary battery according to any one of [1] to [6], wherein the polymer (A) comprises only the first structural unit (a1) and the second structural unit (a2).
  • a separator binder composition for a non-aqueous secondary battery which comprises the separator binder for a non-aqueous secondary battery according to any one of [1] to [11] and an aqueous medium.
  • a separator slurry for a non-aqueous secondary battery which comprises the separator binder for a non-aqueous secondary battery according to any one of [1] to [11], a filler, and an aqueous medium.
  • a separator for a non-aqueous secondary battery comprising a substrate which is a porous film and a coating layer formed on the surface of the substrate.
  • the coating layer is a separator for a non-aqueous secondary battery containing the separator binder for a non-aqueous secondary battery according to any one of [1] to [11] and a filler.
  • the value of the mass ratio of the content of the separator binder for a non-aqueous secondary battery and the content of the filler in the coating layer is 1.0 / 99.0 or more and 15.0 / 85.0 or less.
  • the separator for a non-aqueous secondary battery according to [14].
  • the first step of mixing the polymer (A) and the filler in an aqueous medium, and A second step of adding and mixing the polymer (B) to the mixture obtained in the first step is included.
  • the polymer (A) is a polymer of a compound having an ethylenically unsaturated bond, and is derived from a first structural unit (a1) derived from (meth) acrylamide and a compound having a hydroxyl group and an ethylenically unsaturated bond.
  • the polymer (B) is polyvinyl alcohol having a saponification degree of 55 mol% or more.
  • the value of the mass ratio of the content of the first structural unit (a1) to the content of the second structural unit (a2) in the polymer (A) is 55.0 / 45.0 or more and 95.0. /5.0 or less
  • the value of the mass ratio of the amount of the polymer (A) used and the amount of the polymer (B) used is 55.0 / 45.0 or more and 97.0 / 3.0 or less, which is a non-aqueous secondary battery.
  • Method for manufacturing separator slurry [17] A non-aqueous secondary battery comprising the separator for a non-aqueous secondary battery according to [14] or [15].
  • a separator binder for a non-aqueous secondary battery and a separator binder composition for a non-aqueous secondary battery can be provided. Further, according to the present invention, it is possible to provide a separator for a non-aqueous secondary battery, which is provided with a coating layer having a high peel strength against a substrate and has a small heat shrinkage.
  • a separator binder for a non-aqueous secondary battery also referred to as a binder for a non-aqueous secondary battery separator
  • a separator binder composition for a non-aqueous secondary battery binder composition for a non-aqueous secondary battery separator
  • a separator slurry for a non-aqueous secondary battery also referred to as a slurry for a non-aqueous secondary battery separator
  • the separator binder for a non-aqueous secondary battery is a binder for applying to a separator for a non-aqueous secondary battery
  • the separator binder composition for a non-aqueous secondary battery is a non-aqueous secondary battery. It is a binder composition for application to a separator for a secondary battery
  • the separator slurry for a non-aqueous secondary battery is a separator slurry for application to a separator for a non-aqueous secondary battery.
  • (Meta) acrylic is a general term for acrylic and methacrylic
  • (meth) acrylate is a general term for acrylate and methacrylate.
  • the “nonvolatile component” is a component remaining after weighing 1 g of the composition in an aluminum dish having a diameter of 5 cm and drying at 130 ° C. for 1 hour while circulating air in a dryer at 1 atm (1013 hPa).
  • the form of the composition includes, but is not limited to, a solution, a dispersion, and a slurry.
  • the “nonvolatile content concentration” is the mass ratio (mass%) of the non-volatile content after drying under the above conditions with respect to the mass (1 g) of the composition before drying.
  • Ethylene unsaturated bond refers to an ethylenically unsaturated bond having radical polymerization unless otherwise specified.
  • the "hydroxyl group” does not include OH bonded to an atom other than carbon, OH possessed by an anionic functional group such as a carboxy group, and OH bonded to a carbon atom forming an aromatic ring.
  • the structural unit derived from the compound having a certain ethylenically unsaturated bond is the chemical structure of the portion other than the ethylenically unsaturated bond of the compound and its structure in the polymer. It is assumed that the chemical structure of the part other than the part forming the main chain of the unit is the same.
  • the structural unit derived from acrylamide has a structure of CONH 2 in a portion other than the main chain as a polymer.
  • the chemical structure of the monomer does not correspond to the chemical structure of the polymer, such as the chemical reaction of parts other than the main chain after polymerization
  • the chemical structure after polymerization is used as the standard.
  • the saponified structural unit is a structural unit derived from vinyl alcohol in consideration of the chemical structure of the polymer.
  • polyvinyl alcohol (PVA) obtained by saponifying polyvinyl acetate is a copolymer containing a structural unit derived from vinyl acetate and a structural unit derived from vinyl alcohol when the degree of saponification is not 100 mol%. Will be.
  • the anionic functional group is a functional group that releases cations (hydrogen ion, metal ion, ammonium ion, etc.) when dissolved in water having a pH of 7.0.
  • examples of the anionic functional group include a carboxy group, a sulfo group, a phosphoric acid group, a phenolic hydroxyl group and the like.
  • the surface means "hail noodles”.
  • the separator binder for a non-aqueous secondary battery according to an embodiment of the present invention includes a polymer (A) and a polymer (B).
  • the separator binder for a non-aqueous secondary battery according to an embodiment of the present invention is preferably composed of only the polymer (A) and the polymer (B). Each of the polymer (A) and the polymer (B) will be described below.
  • the polymer (A) is a polymer of a compound having an ethylenically unsaturated bond.
  • the polymer (A) is a copolymer containing a first structural unit (a1) derived from (meth) acrylamide and a second structural unit (a2) derived from a compound having a hydroxyl group and an ethylenically unsaturated bond. be.
  • the polymer (A) preferably does not have an anionic functional group.
  • the solubility of the polymer (A) in 100 g of water is preferably 2.0 g / 100 g or more, more preferably 5.0 g / 100 g or more, and further preferably 10.0 g / 100 g or more. ..
  • the first structural unit (a1) is a structural unit derived from (meth) acrylamide, and examples of the (meth) acrylamide for the first structural unit (a1) include acrylamide, methacrylamide, and mixtures thereof. Be done.
  • the second structural unit (a2) is a structural unit derived from a compound having a hydroxyl group and an ethylenically unsaturated bond, and is a structural unit containing a hydroxyl group.
  • a compound having only one hydroxyl group is preferable.
  • a structural unit derived from (meth) acrylate having a hydroxyl group or vinyl alcohol can be considered.
  • the second structural unit (a2) is preferably a structural unit derived from a (meth) acrylate having a hydroxyl group, and is an alkyl (meth) acrylate in which any hydrogen atom of an alkyl group is substituted with a hydroxyl group. More preferred.
  • Examples of (meth) acrylates having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, hydroxybutyl (meth) acrylate, hydroxypentyl (meth) acrylate, and hydroxyhexyl (meth) acrylate. , Hydroxyoctyl (meth) acrylate, pentaerythritol tri, di or mono (meth) acrylate, trimethylolpropane di or hydroxyalkyl (meth) acrylate such as mono (meth) acrylate and the like.
  • the second structural unit (a2) is more preferably a structural unit derived from 2-hydroxyethyl (meth) acrylate or 2-hydroxypropyl (meth) acrylate, and 2-. It is more preferably hydroxyethyl (meth) acrylate.
  • 2-hydroxyethyl methacrylate is particularly preferable from the viewpoint of improving peel strength and reducing heat shrinkage. The reason why 2-hydroxyethyl methacrylate is particularly effective is not clear, but it is presumed to be due to the synergistic effect with (meth) acrylamide for the first structural unit (a1).
  • the polymerizable property with (meth) acrylamide is different between 2-hydroxyethyl methacrylate and other compounds such as 2-hydroxyethyl acrylate.
  • 2-hydroxyethyl methacrylate has a non-uniform composition ratio of the polymer, and a part of the polymer causes microphase separation, so that the peel strength at a more suitable level is used. It is considered that the improvement of the heat shrinkage and the reduction of heat shrinkage are realized.
  • the value of the mass ratio of the content of the first structural unit (a1) to the content of the second structural unit (a2) in the polymer (A) is It is 55.0 / 45.0 or more, preferably 65.0 / 35.0 or more, and more preferably 75.0 / 25.0 or more. This is because when the binder is applied to a separator for a non-aqueous secondary battery, the heat resistance and electrolytic solution resistance of the coating layer are improved.
  • the value of the mass ratio of the content of the first structural unit (a1) to the content of the second structural unit (a2) in the polymer (A) is , 95.0 / 5.0 or less, more preferably 90.0 / 10.0 or less, and even more preferably 85.0 / 15.0 or less. This is to improve the compatibility between the polymer (A) and the polymer (B), suppress the increase in the viscosity of the slurry described later, and improve the coatability.
  • the polymer (A) may contain structural units derived from other compounds, but the first structural unit (a1) and the second structural unit (a1) and the second structural unit (a1) among all the structural units in the polymer (A).
  • the total content of a2) is preferably 80% by mass or more, more preferably 90% by mass or more, and particularly preferably 100% by mass. That is, it is particularly preferable that the polymer (A) is a copolymer composed of only the first structural unit (a1) and the second structural unit (a2). This is because the effect of the polymer (A), which is the object of the present invention, is further enhanced.
  • the structural unit in the polymer (A1) does not include a structure derived from a polymerization initiator, a terminator, a chain transfer agent, or the like used in the production process.
  • the polymer (A) or the separator binder composition for a non-aqueous secondary battery described later does not contain a heat-crosslinkable constituent component (heat-crosslinkable structural unit or heat-crosslinkable compound). This is to suppress a decrease in dispersibility due to a decrease in the wettability of the polymer with respect to the filler when the polymer (A) is applied to a separator slurry for a non-aqueous secondary battery described later.
  • a heat-crosslinkable constituent component heat-crosslinkable structural unit or heat-crosslinkable compound
  • the polymer (A) when applied to a separator for a non-aqueous secondary battery, it suppresses a change in the size of the separator due to curing shrinkage of the polymer in the coating layer and a decrease in the peel strength of the coating layer with respect to the substrate. Because.
  • the heat-crosslinkable constituent component according to the present embodiment contains a heat-crosslinkable structural unit or a heat-crosslinkable compound.
  • the heat-crosslinkable structural unit include a structural unit derived from a monomer having an epoxy group, a structural unit derived from another functional (meth) acrylate, and the like. Examples of the monomer from which these structural units are derived include glycidyl methacrylate and ethylene glycol dimethacrylate.
  • the heat-crosslinkable compound include compounds used as a cross-linking agent, and examples thereof include carbodiimide compounds, epoxy compounds, and isocyanate compounds.
  • the weight average molecular weight of the polymer (A) is preferably 100,000 or more, more preferably 300,000 or more, and even more preferably 350,000 or more. This is because when the binder is applied to a separator for a non-aqueous secondary battery, the electrolytic solution resistance, strength, and peel strength of the coating layer with respect to the substrate are improved.
  • the weight average molecular weight of the polymer (A) is preferably 3,000,000 or less, more preferably 1,500,000 or less, and even more preferably 650,000 or less. This is because it suppresses an increase in the viscosity of the slurry, which will be described later, and improves the coatability of the slurry on the substrate.
  • the weight average molecular weight is a pullulan-equivalent value measured using gel permeation chromatography (GPC).
  • Examples of the method for synthesizing the polymer (A) include aqueous solution polymerization of a monomer containing (meth) acrylamide and a compound having a hydroxyl group and an ethylenically unsaturated bond.
  • Examples of the radical polymerization initiator used in the synthesis include, but are not limited to, ammonium persulfate, potassium persulfate, hydrogen peroxide, t-butyl hydroperoxide, and azo compounds.
  • Examples of the azo compound include 2,2'-azobis (2-methylpropionamidine) dihydrochloride.
  • a radical polymerization initiator and a reducing agent may be used in combination at the time of polymerization for redox polymerization.
  • the reducing agent include sodium bisulfite, longalit, ascorbic acid and the like.
  • the polymer (B) is polyvinyl alcohol (PVA).
  • the degree of saponification of the polymer (B) is 55 mol% or more, preferably 65 mol% or more, more preferably 70 mol% or more, still more preferably 80 mol% or more. This is because when the binder is applied to a separator for a non-aqueous secondary battery, the heat resistance and electrolytic solution resistance of the coating layer are improved.
  • the saponification degree is a value measured by the measuring method according to JIS K6726 (1994) 3.5 (the simple method is not used).
  • the degree of saponification of the polymer (B) may be 100 mol%, but is preferably 99 mol% or less, more preferably 95 mol% or less, still more preferably 90 mol% or less. This is to ensure the compatibility between the polymer (B) and the polymer (A), suppress the increase in the viscosity of the slurry described later, and improve the coatability on the substrate.
  • the degree of polymerization of the polymer (B) is preferably 100 or more, more preferably 300 or more, further preferably 1000 or more, still more preferably 1500 or more. This is because when the binder is applied to a separator for a non-aqueous secondary battery, the heat resistance and electrolytic solution resistance of the coating layer are improved.
  • the degree of polymerization is a value measured by the measuring method according to JIS K6726 (1994) 3.7.
  • the degree of polymerization of the polymer (B) is preferably 5000 or less, more preferably 4000 or less, and even more preferably 3000 or less. This is to suppress an increase in the viscosity of the slurry, which will be described later, and to improve the coatability on the substrate.
  • the value of the mass ratio of the content of the polymer (A) to the content of the polymer (B) in the separator binder for a non-aqueous secondary battery is 97.0 / 3.0 or less, and 93.0 / 7 It is preferably 0.0 or less, and more preferably 85.0 / 15.0 or less. This is because when the porous organic film is used as the base material, the wettability of the slurry to the base material is improved. Further, when the binder is applied to the separator for a non-aqueous secondary battery, the peel strength of the coating layer with respect to the substrate is improved.
  • the separator binder composition for a non-aqueous secondary battery according to the present embodiment includes the above-mentioned separator binder for a non-aqueous secondary battery and an aqueous medium.
  • a separator binder composition for a non-aqueous secondary battery may be used as a binder composition.
  • the binder composition it is preferable that both the polymer (A) and the polymer (B) are dissolved in an aqueous medium.
  • the binder composition according to the present embodiment may contain components derived from the components used for producing the binder, and polymers other than the polymers contained in the binder of the present invention. It may contain various additives and the like.
  • the organic solvent preferably has a boiling point at atmospheric pressure of 50 to 150 ° C.
  • organic solvent compatible with water examples include alcohols such as methanol, ethanol, n-propyl alcohol and isopropyl alcohol; saturated aliphatic ether compounds such as dipropyl ether, diisopropyl ether, dibutyl ether and diisobutyl ether; tetrahydrofuran, Cyclic ether compounds such as tetrahydropyran and dioxane; organic acid ester compounds such as butyl formate, amyl formate, ethyl acetate, propyl acetate, isopropyl acetate and butyl acetate; ketone compounds such as acetone, ethyl ketone and cyclohexanone can be mentioned.
  • alcohols such as methanol, ethanol, n-propyl alcohol and isopropyl alcohol
  • saturated aliphatic ether compounds such as dipropyl ether, diisopropyl ether, dibutyl ether and diisobut
  • the content of the organic solvent with respect to 100 parts by mass of water is not particularly limited, but is preferably 100 parts by mass or less, and is preferably 20 parts by mass or less. Is more preferable.
  • the total content of the polymer (A) and the polymer (B) in the binder composition can be appropriately adjusted according to the specifications and the like, and is not particularly limited.
  • the total content of the polymer (A) and the polymer (B) in the binder composition is preferably 1.0% by mass or more, more preferably 5.0% by mass or more, and 10%. It is more preferably 0.0% by mass or more. This is because, in the case of producing the slurry described later, the content of the binder can be sufficiently maintained without removing the components such as the aqueous medium.
  • the total content of the polymer (A) and the polymer (B) in the binder composition is preferably 70% by mass or less, more preferably 50% by mass or less. This is to prevent the viscosity of the binder composition from becoming too high.
  • the separator slurry for a non-aqueous secondary battery according to the present embodiment includes the above-mentioned separator binder for a non-aqueous secondary battery, a filler, and an aqueous medium.
  • the separator binder for a non-aqueous secondary battery is as described above.
  • the separator slurry for a non-aqueous secondary battery may be used as a slurry.
  • the slurry according to the present embodiment may contain a component derived from the component used for producing the binder, or may contain a binder or the like other than the binder of the present invention.
  • the filler may be either an organic filler or an inorganic filler, and these may be used in combination.
  • the filler preferably contains an inorganic filler, and more preferably consists of an inorganic filler.
  • Inorganic fillers include calcium carbonate, talc, clay, kaolin, silica, hydrotalcite, diatomaceous soil, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, barium sulfate, aluminum hydroxide, magnesium hydroxide, calcium oxide, magnesium oxide. , Titanium oxide, alumina, mica, zeolite, glass and the like.
  • the inorganic filler may be particles made of one kind of material, or may contain particles made of two or more kinds of materials. Further, the inorganic filler may be prepared by mixing particles having different particle size distributions.
  • the filler preferably contains metal oxide particles, and more preferably contains alumina particles. This is because the alumina particles have an excellent affinity with the binder according to the present embodiment, have good dispersibility during kneading, and can obtain a slurry having a low viscosity and good coatability.
  • the average particle size of the particles constituting the filler is preferably 3 ⁇ m or less, and more preferably 1 ⁇ m or less.
  • the average particle size referred to here is a number average value of the primary particle size obtained by SEM (scanning electron microscope) observation. Specifically, 100 particles of the filler reflected in the SEM are randomly selected, the longest dimension of each particle is measured, and the average value of these measured dimensions is the average particle size of the filler.
  • the value of the mass ratio (binder content / filler content) between the binder content and the filler content in the slurry is preferably 1.0 / 99.0 or more, and 2.0 / 98. It is more preferably 0 or more, and further preferably 4.0 / 96.0 or more. This is to improve the peel strength of the coating layer made from the slurry to the substrate and to sufficiently fix the filler particles to the coating layer. It is also for improving the heat resistance of the coating layer.
  • the value of the mass ratio of the content of the binder to the content of the filler in the slurry is preferably 15.0 / 85.0 or less, more preferably 10.0 / 90.0 or less, and 7. It is more preferably 0 / 93.0 or less. This is to obtain a battery having good load characteristics by sufficiently maintaining the air permeability and the permeability of ions in the separator described later.
  • a mixed solvent of water and an organic solvent having a boiling point at atmospheric pressure of 50 to 150 ° C. and compatible with water may be used.
  • the organic solvent are the same as those of the compound exemplified in the section of the binder composition.
  • the content of the organic solvent with respect to 100 parts by mass of water is not particularly limited, but is preferably 100 parts by mass or less, and is preferably 20 parts by mass or less. Is more preferable.
  • the content of the aqueous medium in the slurry can be appropriately adjusted according to the specifications and the like, and is not limited.
  • the content of the aqueous medium in the slurry is preferably 80% by mass or less, more preferably 70% by mass or less, and further preferably 60% by mass or less. This is because when the slurry is applied to the substrate, a coating layer having a sufficient thickness can be formed with a smaller amount of slurry.
  • the content of the aqueous medium in the slurry is preferably 20% by mass or more, more preferably 30% by mass or more, and further preferably 40% by mass or more. This is to keep the viscosity of the slurry within a range suitable for coating.
  • Manufacturing method of separator slurry for non-aqueous secondary batteries for example, a first method in which a polymer (A) and a polymer (B) are mixed in an aqueous medium to prepare a binder composition, and then a filler is mixed and dispersed; a filler and a weight are used. A second method in which the coalescence (A) is mixed in an aqueous medium, the filler is dispersed, and then the polymer (B) is added; the filler and the polymer (B) are mixed in the aqueous medium, and the filler is dispersed.
  • the second method is preferable in order to improve the peel strength of the coating layer described later.
  • the first method of preparing the binder composition in advance may be preferable in order to reduce the production cost of the slurry and the management cost of the material.
  • the separator for a non-aqueous secondary battery according to the present embodiment includes a base material which is a porous film and a coating layer formed on the surface of the base material.
  • the coating layer according to the present embodiment may be formed on either of the surfaces of the base material facing the positive electrode and the surface facing the negative electrode, or may be formed on both surfaces.
  • the separator for a non-aqueous secondary battery may include, for example, an adhesive layer, a protective layer, and the like.
  • the separator for a non-aqueous secondary battery according to the present embodiment may be referred to as a separator.
  • the material of the base material examples include thermoplastic resins such as polyolefin, papermaking such as biscorayon and natural cellulose, mixed papermaking obtained by papermaking fibers such as cellulose and polyester, electrolytic paper, kraft paper, and Manila paper. , Manila hemp sheet, glass fiber, porous polyester, aramid fiber, polybutylene terephthalate non-woven fabric, para-aramid, vinylidene fluoride, tetrafluoroethylene, copolymer of vinylidene fluoride and propylene hexafluoride, fluororubber, etc.
  • examples thereof include a non-woven fabric such as a fluororesin or a porous film.
  • the material of the base material is preferably polyolefin.
  • the polyolefin include homopolymers or copolymers such as ethylene, propylene, 1-butene, 4-methyl-1-pentene and 1-hexene. Of these, a copolymer mainly composed of ethylene or a homopolymer of ethylene is preferable, and a homopolymer of ethylene, that is, polyethylene is more preferable.
  • the thickness of the base material is preferably 5 to 50 ⁇ m, more preferably 5 to 30 ⁇ m.
  • a commercially available porous film may be used as the base material.
  • the coating layer contains the above-mentioned separator binder for a non-aqueous secondary battery and the above-mentioned filler.
  • the thickness of the coating layer is not particularly limited, but is preferably 10 ⁇ m or less. This is to improve the load characteristics of the non-aqueous electrolyte secondary battery provided with the separator.
  • the method for producing the separator for a non-aqueous secondary battery is not particularly limited, and examples thereof include a method in which the slurry according to the present embodiment is applied to the surface of the base material and the applied slurry is dried. Before applying the slurry to the surface of the base material, the base material may be subjected to surface treatment such as corona treatment in advance.
  • Examples of the method of applying the slurry to the surface of the base material include industrially usual methods such as application with a doctor blade.
  • the thickness of the coating layer can be controlled by adjusting the coating amount of the slurry, the concentration of the solid content in the slurry, and the like.
  • drying the slurry applied to the base material By drying the slurry applied to the base material, volatile components are removed from the slurry and a coating layer is formed.
  • the drying include a method using a heating device such as a drying furnace, a method using a depressurizing device, a method of performing both heating and depressurization, and the like.
  • Conditions such as heating, depressurization, and drying time can be appropriately selected according to the material and form of the base material, the type of solvent contained in the volatile matter, etc.
  • the drying temperature is equal to or lower than the melting point or glass transition point of the base material. It is preferable to set it in the range of.
  • the drying temperature of the slurry is preferably 100 ° C. or lower, more preferably 80 ° C.
  • the temperature is preferably 50 ° C. or higher. Further, it is preferable to set the depressurization condition to such an extent that bubbles and the like are not generated in the coating layer while considering productivity.
  • the drying conditions are preferably 55 to 65 ° C. for 2 to 10 minutes, and 60 ° C. for 5 minutes. It is more preferable to do so. This is to prevent the pores in the porous film from being crushed due to softening or melting of the thermoplastic resin contained in the porous film. It was
  • Non-water-based secondary battery has a configuration in which a positive electrode, a negative electrode, an electrolytic solution, and a separator are housed in an exterior body.
  • the separator is arranged between the positive electrode and the negative electrode. It is preferable that the positive electrode active material layer of the positive electrode and the negative electrode active material layer of the negative electrode are arranged so as to face each other with the separator interposed therebetween.
  • the separator has the above-mentioned configuration.
  • the non-aqueous secondary battery is a lithium ion secondary battery
  • the non-aqueous secondary battery is not limited to this, and for example, a potassium ion secondary battery, a sodium ion secondary battery, etc. But it may be.
  • Electrodes positive electrode and negative electrode
  • the electrode includes a current collector and an electrode active material layer formed on the current collector.
  • a metal foil is used as the current collector, and in the case of a lithium ion secondary battery, an aluminum foil is preferably used as the positive electrode and a copper foil is preferably used as the negative electrode.
  • Examples of the shape of the current collector include a foil, a flat plate, a mesh, a net, a lath, a punching shape, an embossed shape, or a combination thereof (for example, a mesh flat plate). ..
  • the surface of the current collector may have irregularities formed by etching.
  • the electrode active material layer has a structure in which the electrode active material is fixed to the current collector via the electrode binder. Further, the electrode active material layer may contain an additive such as a conductive auxiliary agent.
  • the electrode active material can store and release ions that become charge carriers (lithium ions in the case of a lithium ion secondary battery), and the positive electrode active material uses a material that is electrochemically more precious than the negative electrode active material. ..
  • a lithium composite oxide containing nickel such as a Ni—Co—Mn-based lithium composite oxide, a Ni—Mn—Al based lithium composite oxide, and a Ni—Co—Al based lithium composite oxide.
  • these substances may be used alone or in combination of two or more.
  • the negative electrode active material examples include silicon, silicon oxide (SiO 2 and the like), carbonaceous substances, metal composite oxides and the like, and preferably carbonaceous materials such as amorphous carbon, artificial graphite and natural graphite;
  • a x M. y O z In the formula, A is Li, M is at least one selected from Co, Ni, Al, Sn and Mn, O is an oxygen atom, and x, y and z are 1.10 ⁇ x ⁇ 0, respectively. .05, 4.00 ⁇ y ⁇ 0.85, 5.00 ⁇ z ⁇ 1.5), and other metal oxides and the like.
  • the negative electrode active material may be composed of one kind of substance or may be composed of two or more kinds of substances.
  • the binder according to this embodiment may be used, or other resin or the like may be used.
  • the material used as the electrode binder is an acrylic obtained by copolymerizing a monomer containing (meth) acrylic acid ester and (meth) acrylic acid in addition to the polymer (A) and the polymer (B) described in the present embodiment. Examples thereof include, but are not limited to, a system copolymer, a copolymer of (meth) acrylate and N-vinylacetamide, styrene-butadiene rubber, and polyvinylidene fluoride. Further, the electrode binder may contain a plurality of types of materials.
  • carbon black examples include furnace black, acetylene black, denka black (registered trademark) (manufactured by Denka Co., Ltd.), and Ketjen black (registered trademark) (manufactured by Ketjen Black International Co., Ltd.).
  • Examples of the carbon fiber include carbon nanotubes and carbon nanofibers, and examples of the carbon nanotube include VGCF (registered trademark, manufactured by Showa Denko Co., Ltd.), which is a vapor phase carbon fiber.
  • Electrolyte examples of the electrolytic solution include a solution in which an electrolyte is dissolved in an organic solvent and an ionic liquid, and a solution is preferable.
  • an alkali metal salt can be used and can be appropriately selected depending on the type of the electrode active material and the like.
  • the electrolyte include LiClO 4 , LiBF 6 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiB 10 Cl 10 , LiAlCl 4 , LiCl, LiBr, LiB (C2H 5 ). 4 , CF 3 SO 3 Li, CH 3 SO 3 Li, LiCF 3 SO 3 , LiC 4 F 9 SO 3 , Li (CF 3 SO 2 ) 2 N, lithium aliphatic carboxylate and the like can be mentioned. Further, other alkali metal salts can also be used as the electrolyte.
  • the organic solvent that dissolves the electrolyte is not particularly limited, and is, for example, ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC), methyl ethyl carbonate (MEC), dimethyl carbonate (DMC), and fluoroethylene carbonate.
  • EC ethylene carbonate
  • PC propylene carbonate
  • DEC diethyl carbonate
  • MEC methyl ethyl carbonate
  • DMC dimethyl carbonate
  • fluoroethylene carbonate examples thereof include carbonic acid ester compounds such as (FEC) and vinylene carbonate (VC), nitrile compounds such as acetonitrile, and carboxylic acid esters such as ethyl acetate, propyl acetate, methyl propionate, ethyl propionate and propyl propionate.
  • FEC propylene carbonate
  • MEC methyl ethyl carbonate
  • DMC dimethyl carbonate
  • fluoroethylene carbonate
  • the exterior body for example, a laminated material of an aluminum foil and a resin film can be appropriately used, but the exterior body is not limited to this.
  • the shape of the battery may be any shape such as a coin type, a button type, a sheet type, a cylindrical type, a square type, and a flat type.
  • any one of “polymer (A-1) to polymer (A-6)” may be referred to as “polymer (A)".
  • polymer (CA-1), polymer (CA-2), or polymer (CA-3) (described later) may be referred to as “polymer (CA)”.
  • Step 1 In the synthesis of each polymer, ion-exchanged water was poured into a reaction vessel equipped with a stirrer, a thermometer and a condenser in the amount shown in the column of step 1 in Table 1, and the temperature was 80 ° C. while stirring in a nitrogen atmosphere. The temperature was raised to.
  • Step 2 When the temperature reached 80 ° C., an initiator aqueous solution prepared by dissolving 0.50 g of ammonium persulfate in 6.6 g of ion-exchanged water was added in a batch. Simultaneously with the addition of the initiator aqueous solution, in the synthesis of each polymer, 50% by mass acrylamide aqueous solution, 2-hydroxyethyl acrylate, and ion-exchanged water were started to be dropped in the amounts shown in the column of step 2 in Table 1, and then dropped. Went for 30 minutes. Then, the reaction was carried out at 80 ° C. for 2 hours. The amount of Am alone in Table 1 is the mass (g) of acrylamide contained in the aqueous acrylamide solution used.
  • Step 3 Then, in the synthesis of each polymer, ion-exchanged water was added in the amount shown in the column of step 3 in Table 1.
  • the non-volatile content, viscosity, pH, and weight average molecular weight of the polymer were measured by the methods described below, and the measurement results are shown in Table 1.
  • aqueous solution of the polymer (A) and the aqueous solution of the polymer (CA) were measured by a Brookfield viscometer (manufactured by Toki Sangyo Co., Ltd.) at a liquid temperature of 23 ° C. and a rotation speed of 10 rpm. 3, No. 4 and No. Viscosity was measured using any of the rotors of 5. The rotor is selected according to the viscosity of each aqueous solution.
  • GPC device GPC-101 (manufactured by Showa Denko KK) Solvent: 0.1M NaNO 3 aqueous solution
  • Sample column Shodex Volume Ohpak SB-806 HQ (8.0 mm ID x 300 mm) x 2 Reference column: Shodex Colon Ohpak SB-800 RL (8.0 mm ID x 300 mm) x 2
  • Column temperature 40 ° C
  • Pump DU-H2000 (manufactured by Shimadzu Corporation) Pressure: 1.3MPa Flow rate: 1 ml / min
  • Molecular weight standard Pullulan (P-5, P-10, P-20, P-50, P-100, P-200, P-400, P-800, P-1300, P-2500 (Showa Denko KK) Made))
  • Table 1 shows the copolymerization ratio of the produced polymer, that is, the mass ratio of the structural unit derived from acrylamide and the structural unit derived from 2-hydroxyethyl acrylate in the polymer.
  • the copolymerization ratio shown here is the mass ratio of acrylamide and 2-hydroxyethyl acrylate used in step 2.
  • the saponification degree of the polymers (B-1) to (B-4) was measured by the measuring method of JIS K6726 (1994) Section 3.5 (the simple method is not used).
  • the degree of polymerization of the polymers (B-1) to (B-4) was measured by the measuring method of JIS K6726 (1994) Section 3.7.
  • the non-volatile content (mass%) and viscosity (mPa ⁇ s) of the prepared aqueous solution were measured by the same method as that of the aqueous solution of the polymer (A), and the measurement results are shown in Table 2.
  • Example 1 the components used in each Example / Comparative Example and their amounts are as shown in Tables 3 to 5.
  • Example 1 a 14.5% by mass aqueous solution of the polymer (A-2) was added in an amount of 65.5 g (9.5 g of the polymer (A-2) and 56.0 g of water).
  • the amount of alumina added is as shown in Tables 3 to 5. For example, in Example 1, 190 g of alumina was added.
  • the amount of ion-exchanged water added is combined with the water contained in the aqueous solution of the polymer (A) or the aqueous solution of the polymer (CA) for Examples 1 to 8 and 14 to 21 and Comparative Examples 1 to 4. It was adjusted to 100 g. For example, in Example 1, 44.0 g of ion-exchanged water was added. Further, in Examples 10 to 12, 23 to 25 and Comparative Example 5, the amount of ion-exchanged water added was 233 g including the water contained in the aqueous solution of the polymer (A) or the aqueous solution of the polymer (CA). Adjusted to be.
  • the types of the aqueous solution of the polymer (B) used in each Example / Comparative Example are as shown in Tables 3 to 5, and the amount of the aqueous solution of the polymer (B) added is the polymer (B).
  • the amount of the above was adjusted to be the amount shown in Tables 3 to 5.
  • Example 1 5.0 g (0.50 g of polymer (B-1), 4.5 g of water) of a 10.0 mass% aqueous solution of the polymer (B-1) was added.
  • the amount of ion-exchanged water added in this step was adjusted to 100 g together with the water contained in the aqueous solution of the polymer (B). For example, in Example 1, 95.5 g of ion-exchanged water was added.
  • preparation method I The slurry preparation method described above is referred to as preparation method I in Tables 3 to 5.
  • the types of the aqueous solution of the polymer (A) used in each example are as shown in Tables 3 to 5, and the amount of the aqueous solution of the polymer (A) added is the amount of the polymer (A).
  • the amount was adjusted to be as shown in Tables 3 to 5.
  • 55.2 g (8.0 g of the polymer (A-2) and 47.2 g of water) of a 14.5% by mass aqueous solution of the polymer (A-2) was added.
  • the amount of alumina added was 190 g in Example 9 and 323 g in Example 13.
  • the types of the aqueous solution of the polymer (B) used in each example are as shown in Tables 3 to 5, and the amount of the aqueous solution of the polymer (B) added is the amount of the polymer (B).
  • the amount was adjusted to be as shown in Tables 3 to 5.
  • a 10.0 mass% aqueous solution of the polymer (B-1) was added in an amount of 20.0 g (2.0 g of the polymer (B-1) and 18.0 g of water).
  • Example 9 The amount of ion-exchanged water added was 34.8 g in Example 9 and 170.9 g in Example 13.
  • preparation method II The slurry preparation method described above is referred to as preparation method II in Tables 3 to 5.
  • Comparative Example 7 A slurry was prepared in the same manner as in Comparative Example 6 except that the same amount of a 14.5% by mass aqueous solution of the polymer (CA-1) was used.
  • Comparative Example 10 A slurry was prepared in the same manner as in Comparative Example 9 except that the same amount of a 10.0% by mass aqueous solution of the polymer (B-4) was used instead of the 10.0% by mass aqueous solution of the polymer (B-3). ..
  • Comparative Example 11 In Comparative Example 11, the slurry was not prepared, and the evaluation was performed using only the separator described later.
  • Comparative Example 11 the slurry was not applied to the separator, and only the heat shrinkage described later was evaluated.
  • peeling strength of coating layer The peel strength of the coating layer with respect to the substrate was measured as follows. A separator having coating layers on both sides produced by the above step was cut into a size of 15 mm ⁇ 100 mm to obtain a test piece.
  • the pasting was performed by reciprocating a 2 kg roller once in an atmosphere of 23 ° C. After leaving the cellophane tape attached to the coating layer for 20 minutes, one end of the cellophane tape is folded back 180 ° and pulled toward the other end facing the other end at a speed of 100 mm / min to peel it off, and the peeling length (mm). ) -A graph of peeling force (mN) was obtained.
  • a testing machine Teensilon RTG-1210 (manufactured by A & D Co., Ltd.) was used.
  • the average value (mN) of the peeling force at the peeling length of 10 to 45 mm was calculated, and the value obtained by dividing the average value of the peeling force by the width of the test piece of 15 mm was the peeling strength (mN / mm) of the coating layer. And said.
  • the peeling strength (mN / mm) of the coating layer was the peeling strength (mN / mm) of the coating layer.
  • the separator was placed on a stainless steel plate having a thickness of 0.8 mm, a length of 150 mm, a width of 70 mm, and a mass of 65 g, and a stainless steel plate of the same size and mass was placed on the separator. That is, the separator is sandwiched between two stainless steel plates, and the separator is fixed by the weight of the upper stainless steel plate.
  • the separator sandwiched between the stainless steel plates was allowed to stand in a constant temperature bath at 150 ° C. for 60 minutes. After taking out the separator, the length in the MD direction was read with a caliper, and the heat shrinkage rate was calculated according to the following equation.
  • Heat shrinkage rate (%) [ ⁇ (100 (mm) -length after heating (mm)) / 100 (mm) ⁇ x 100]
  • Comparative Example 1 a slurry was prepared using a polymer (CA-1) containing a large amount of structural units (first structural unit (a1)) derived from acrylamide instead of the polymer (A). However, the produced slurry could not be applied to the base material, and a coating layer was not formed.
  • Comparative Example 6 a binder containing no polymer (B) was used, but the peel strength of the formed coating layer was not sufficient.
  • Comparative Example 7 a polymer (CA-1) containing a large amount of structural units derived from acrylamide (first structural unit (a1)) is used instead of the polymer (A), and the polymer (B) is not contained.
  • a slurry was prepared. However, the produced slurry had insufficient wettability to the base material, the slurry could not be applied to the base material, and the coating layer could not be formed.
  • Comparative Example 9 and Comparative Example 10 a binder containing no polymer (A) was used, but the formed coating layer could not sufficiently suppress the thermal shrinkage of the separator.
  • Comparative Example 11 the evaluation was performed using a separator containing only the base material without forming the coating layer, but the heat shrinkage of the separator was large.
  • the present invention it is possible to produce a slurry having good wettability to a substrate and good coatability, a coating layer having high peel strength can be formed on the separator, and the heat of the separator can be formed. It can be said that it is possible to provide a separator binder for a non-aqueous secondary battery and a separator binder composition for a non-aqueous secondary battery capable of suppressing shrinkage. Further, according to the present invention, it can be said that it is possible to provide a separator for a non-aqueous secondary battery which is provided with a coating layer having a high peel strength against a substrate and has a small heat shrinkage.

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Abstract

L'invention concerne un liant de séparateur pour batterie secondaire non aqueuse et une composition de liant de séparateur pour batterie secondaire non aqueuse qui permettent de produire une bouillie ayant une bonne mouillabilité et une bonne aptitude au revêtement sur un substrat, qui permettent de former une couche de revêtement ayant une résistance au pelage élevée sur un séparateur, et qui peuvent supprimer le retrait thermique du séparateur. Le liant de séparateur pour batterie secondaire non aqueuse de la présente invention comprend un polymère (A) et un polymère (B). Dans le polymère (A), la chaîne principale est une structure de polyoléfine et a une première unité structurale (a1) dérivée d'un (méth)acrylamide et une seconde unité structurale (a2) dérivée d'un composé ayant un groupe hydroxyle et une liaison insaturée éthylénique. Le polymère (B) est un alcool polyvinylique ayant un degré de saponification de 55 % en moles ou plus. Dans le polymère (A), la valeur du rapport massique de (a1) et (a2) est de 55,0/45,0 à 95,0/5,0, et la valeur du rapport massique de (A) et (B) est de 55,0/45,0 à 97,0/3,0.
PCT/JP2021/046014 2020-12-24 2021-12-14 Liant de séparateur pour batterie secondaire non aqueuse, séparateur pour batterie secondaire non aqueuse, procédé de production de bouillie de séparateur pour batterie secondaire non aqueuse et batterie secondaire non aqueuse WO2022138322A1 (fr)

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