Classifications

• • 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
  • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
  • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• • 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
  • H01M50/443—Particulate 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
  • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
  • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
• • 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
  • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
• • 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 an aqueous resin composition for a lithium ion secondary battery separator, a slurry for a functional layer, and a lithium ion secondary battery separator.
• secondary batteries have used battery members that include an adhesive layer for the purpose of improving adhesion between battery members, a porous film layer for the purpose of improving heat resistance, strength, etc.
• an electrode is formed by further forming an adhesive layer and/or a porous membrane layer on an electrode base material formed by providing an electrode mixture layer on a current collector, and an electrode formed by further forming an adhesive layer and/or a porous membrane layer on a separator base material.
• a separator formed with a porous membrane layer is used as a battery member.
• the adhesive layer and porous membrane layer are usually prepared using a slurry-like adhesive layer or porous membrane layer slurry containing components for exhibiting a desired function, a binder component, and a dispersion medium such as water.
• the composition is formed by applying the composition onto a suitable substrate such as an electrode substrate or a separator substrate and drying it.
• Patent Document 1 a particulate polymer having a core-shell structure including a core part and a shell part partially covering the outer surface of the core part, and a binder containing an acrylic polymer are used in a lithium ion secondary battery.
• Techniques used to form adhesive layers are disclosed. Further, a technique is disclosed in which alumina and a binder containing an acrylic polymer are used to form a porous membrane for a lithium ion secondary battery.
• the problem to be solved by the present invention is to provide an aqueous resin composition for a lithium ion secondary battery separator that allows a separator with excellent adhesion to electrodes and heat shrinkage resistance to be obtained in one coat.
• the present invention provides an aqueous resin composition for a lithium ion secondary battery separator containing organic particles (A) and an aqueous medium (B), wherein the organic particles (A) have a volume average particle diameter of 6 to 20 ⁇ m.
• the present invention relates to an aqueous resin composition for a lithium ion secondary battery separator, which is characterized by the following.
• a separator with excellent adhesion to electrodes and heat shrinkage resistance can be obtained. It can be suitably used as a separator for secondary batteries.
• the aqueous resin composition for a lithium ion secondary battery separator of the present invention is an aqueous resin composition for a lithium ion secondary battery separator containing an organic particle (A) and an aqueous medium (B), the aqueous resin composition for a lithium ion secondary battery separator containing the organic particles (A) and an aqueous medium (B). ) has a volume average particle diameter of 6 to 20 ⁇ m.
• the volume average particle diameter of the organic particles (A) is 6 to 20 ⁇ m, and when it is 6 ⁇ m or more, the adhesion between the resulting porous membrane layer and the separator and electrode is excellent, and the volume average particle diameter is 20 ⁇ m or less. This results in excellent dispersion stability.
• the volume average particle diameter of the organic particles (A) is preferably 6 to 15 ⁇ m, since the dispersion stability is further improved.
• the CV value of the organic particles (A) is preferably 0 to 80% since the adhesion between the electrode and the separator is further improved.
• the glass transition temperature of the organic particles (A) is preferably 10 to 110°C. If the temperature is 10° C. or higher, blocking will be less likely to occur when winding up onto a separator roll, improving workability. If the temperature is 110° C. or lower, the adhesiveness between the electrode and the separator will be further improved.
• the gel fraction of the organic particles (A) with respect to the mixed solvent is preferably 90% or more, more preferably 95% or more.
• Examples of the organic component forming the organic particles (A) include resins such as acrylic resin, epoxy resin, urethane resin, and polyester resin, with acrylic resin being preferred.
• the acrylic resin can be obtained, for example, by radical polymerizing monomer raw materials such as acrylic monomers and vinyl monomers.
• the monomers include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, i-butyl (meth)acrylate, t-butyl (meth)acrylate, 2 - Alkyl (meth)acrylates such as ethylhexyl (meth)acrylate, lauryl (meth)acrylate, and stearyl (meth)acrylate; (meth)acrylic acid, unsaturated monocarboxylic acids such as crotonic acid, maleic anhydride, maleic acid, anhydride Monomers with carboxyl groups such as unsaturated dicarboxylic acids such as itaconic acid, itaconic acid, and fumaric acid; 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxy-n-butyl ( meth)acrylate, 2-hydroxypropyl(meth)acrylate,
• crosslinkable monomers such as monomers having alkoxysilyl groups, di(meth)acrylate monomers, etc. are used, since the swelling ratio and gel fraction in the mixed solvent of the organic particles (A) are further improved. Preference is given to using monomers.
• the amount of the crosslinkable monomer in the monomer raw material is preferably 0.1 to 20% by mass. If it is 0.1% by mass or more, the swelling ratio and gel fraction with respect to the mixed solvent will be further improved. If it is 20% by mass or less, the adhesiveness between the electrode and the separator will be further improved.
• (meth)acrylic acid refers to one or both of acrylic acid and methacrylic acid
• (meth)acryloyl refers to one or both of acryloyl and methacryloyl
• (meth)acrylic acid refers to one or both of acryloyl and methacryloyl
• (meth)acrylic acid refers to one or both of acryloyl and methacryloyl.
• “Acrylate” refers to one or both of acrylate and methacrylate.
• the organic particles (A) having a volume average particle diameter of 6 to 20 ⁇ m there are various methods for producing the organic particles (A) having a volume average particle diameter of 6 to 20 ⁇ m, but the organic particles (A) can be obtained by simple operations without using any special additives. Therefore, the suspension polymerization method is preferable.
• the monomer raw material and the polymerizable monomer component including the polymerization initiator and the critical micelle concentration for example, the monomer raw material and the polymerizable monomer component including the polymerization initiator and the critical micelle concentration
• surfactant Prepare an emulsion by stirring an aqueous solution containing a surfactant at a concentration higher than the minimum concentration at which micelles are formed in an aqueous solution, and add an aqueous solution containing a dispersion stabilizer to this emulsion to adjust the concentration of the surfactant.
• a method of radical polymerization at a temperature of 50 to 100° C. after reducing the micelle concentration to less than the critical micelle concentration can be mentioned.
• Examples of the polymerization initiator include azo compounds such as 2,2'-azobis(isobutyronitrile), 2,2'-azobis(2-methylbutyronitrile), and azobiscyanovaleric acid; tert-butylperoxy Organic peroxides such as pivalate, tert-butyl peroxybenzoate, tert-butyl peroxy-2-ethylhexanoate, di-tert-butyl peroxide, cumene hydroperoxide, benzoyl peroxide, and tert-butyl hydroperoxide.
• Oxides examples include inorganic peroxides such as hydrogen peroxide, ammonium persulfate, potassium persulfate, and sodium persulfate. Note that these polymer initiators can be used alone or in combination of two or more.
• Examples of the aqueous medium (B) include water, organic solvents miscible with water, and mixtures thereof.
• organic solvents that are miscible with water include alcohols such as methanol, ethanol, n-propanol, and isopropanol; ketones such as acetone and methyl ethyl ketone; polyalkylene glycols such as ethylene glycol, diethylene glycol, and propylene glycol; and alkyl ethers of polyalkylene glycols. and lactams such as N-methyl-2-pyrrolidone.
• water alone may be used, a mixture of water and a water-miscible organic solvent may be used, or only a water-miscible organic solvent may be used. From the viewpoint of safety and environmental impact, it is preferable to use only water or a mixture of water and an organic solvent miscible with water, and it is particularly preferable to use only water.
• aqueous medium (B) it is convenient and preferable to use the aqueous medium used when producing the organic particles (A) by a suspension polymerization method as is.
• the emulsifier examples include sulfuric esters of higher alcohols and their salts, alkylbenzene sulfonates, polyoxyethylene alkylphenyl sulfonates, polyoxyethylene alkyl diphenyl ether sulfonates, sulfuric acid half ester salts of polyoxyethylene alkyl ethers, Anionic emulsifiers such as alkyldiphenyl ether disulfonates, succinic acid dialkyl ester sulfonates; polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene diphenyl ethers, polyoxyethylene-polyoxypropylene block copolymers, Examples include nonionic emulsifiers such as acetylene diol-based emulsifiers; cationic emulsifiers such as alkylammonium salts; and amphoteric emulsifiers such as alkyl (amide) betaines and al
• the mixed liquid consisting of the polymerizable monomer component containing the acrylic monomer and the polymerization initiator and the aqueous solution containing the surfactant while applying shear, for example, using a homomixer, high pressure, etc.
• Stirring devices such as homogenizers, ultrasonic dispersion devices, high-pressure jet dispersion devices, and static mixers can be used.
• an emulsion with a volume average particle diameter of 6 to 20 ⁇ m can be easily prepared.
• An aqueous solution containing a dispersion stabilizer is added to the emulsion obtained as described above to form a dispersion in which the concentration of surfactant in the emulsion is less than the critical concentration of 0.01 to 1.0, and then suspension polymerization is carried out. By doing so, the organic particles having a volume average particle diameter of 6 to 20 ⁇ m can be obtained.
• dispersion stabilizer examples include water-soluble resins such as polyvinyl alcohol, polyvinylpyrrolidone, methylcellulose, and hydroxyethylcellulose. Note that these dispersion stabilizers can be used alone or in combination of two or more.
• the aqueous resin composition for a lithium ion secondary battery separator of the present invention contains the organic particles (A) and the aqueous medium (B), and the resin particles obtained by the suspension polymerization method ( Preferably, A) is dispersed in an aqueous medium (B).
• the amount of organic solvent in the aqueous resin composition of the present invention can be reduced by performing a solvent removal step as necessary.
• the aqueous resin composition of the present invention obtained by the above method contains 5 to 60% by mass of the organic particles (A) based on the total amount of the aqueous resin composition, since coating workability is further improved. is preferable, and one containing 10 to 50% by mass is more preferable.
• the aqueous resin composition of the present invention preferably contains 95 to 40% by mass of the aqueous medium (B) based on the total amount of the aqueous resin composition, since the coating workability is further improved. It is more preferable to contain up to 50% by mass.
• the aqueous resin composition of the present invention may contain a water-soluble polymerization inhibitor such as sodium nitrite and hydroquinone, if necessary.
• the aqueous resin composition of the present invention may contain a curing agent, a curing catalyst, a lubricant, a filler, a thixotropic agent, a tackifier, a wax, a heat stabilizer, a light stabilizer, and a fluorescent whitening agent, as necessary.
• additives such as foaming agents, pH adjusters, leveling agents, anti-gelling agents, dispersion stabilizers, antioxidants, radical scavengers, heat resistance imparters, inorganic fillers, organic fillers, plasticizers, reinforcing agents , catalyst, antibacterial agent, antifungal agent, rust preventive agent, thermoplastic resin, thermosetting resin, pigment, dye, conductivity imparting agent, antistatic agent, moisture permeability improver, water repellent, oil repellent, hollow foam crystal water-containing compounds, flame retardants, water absorbing agents, moisture absorbing agents, deodorizing agents, foam stabilizers, antifoaming agents, antifungal agents, preservatives, algaecides, pigment dispersants, antiblocking agents, hydrolysis prevention Agents and pigments can be used in combination.
• the slurry for a lithium ion secondary battery separator functional layer of the present invention contains the aqueous resin composition of the present invention, non-conductive particles, and a water-soluble polymer.
• the aqueous resin composition contains 0.1 to 100% by mass of organic particles (A) and 0.1 to 100% by mass of water-soluble polymer based on 100 parts by mass of non-conductive particles. It is preferable to do so.
• non-conductive particles for example, inorganic particles or organic particles can be used, but inorganic particles are preferable.
• the inorganic particles include oxide particles such as aluminum oxide (alumina), silicon oxide, magnesium oxide, titanium oxide, BaTiO 2 , ZrO, and alumina-silica composite oxide, and nitrides such as aluminum nitride and boron nitride.
• oxide particles such as aluminum oxide (alumina), silicon oxide, magnesium oxide, titanium oxide, BaTiO 2 , ZrO, and alumina-silica composite oxide, and nitrides such as aluminum nitride and boron nitride.
• covalent crystal particles such as silicon and diamond, poorly soluble ionic crystal particles such as barium sulfate, calcium fluoride, and barium fluoride, and fine clay particles such as talc and montmorillonite.
• aluminum oxide (Alumina) is preferred.
• these inorganic particles can be used alone or in combination of two or more types.
• the organic particles include, for example, polyethylene, polystyrene, polydivinylbenzene, crosslinked styrene-divinylbenzene copolymer, polyimide, polyamide, polyamideimide, melamine resin, phenol resin, benzoguanamine-formaldehyde condensate, etc.
• examples include various crosslinked polymer particles and heat-resistant polymer particles such as polysulfone, polyacrylonitrile, polyaramid, polyacetal, and thermoplastic polyimide. Note that these organic particles can be used alone or in combination of two or more.
• water-soluble polymer examples include cellulose polymers such as carboxymethyl cellulose, methyl cellulose, and hydroxypropyl cellulose, and their ammonium salts and alkali metal salts; poly(meth)acrylic acid and their ammonium salts and alkali metal salts; polyvinyl Polyvinyl alcohol compounds such as alcohol, acrylic acid or a copolymer of acrylic acid and vinyl alcohol, maleic anhydride or a copolymer of maleic acid or fumaric acid and vinyl alcohol; polyethylene glycol, polyethylene oxide, polyvinylpyrrolidone, modified polyacrylic Examples include acid, oxidized starch, phosphate starch, casein, and various modified starches. Note that these water-soluble polymers can be used alone or in combination of two or more.
• the particulate polymer examples include crosslinked poly(meth)acrylic acid particles, crosslinked poly(meth)acrylic ester particles, crosslinked polystyrene particles, copolymerized crosslinked resin particles of (meth)acrylic ester and styrene, and melamine.
• examples include resin particles, nylon particles, polyimide particles, polyamideimide particles, phenol resin particles, polytetrafluoroethylene particles, fluororesin particles, and silicone resin particles. Note that these particulate polymers can be used alone or in combination of two or more.
• the functional layer in the present invention can be formed by coating the above-mentioned functional layer slurry on a separator.
• the method for applying the functional layer slurry composition onto the base material is not particularly limited, and any known method can be used. Specifically, as a coating method, a doctor blade method, a dip method, a reverse roll method, a direct roll method, a gravure method, an extrusion method, a brush coating method, etc. can be used. At this time, the functional layer slurry composition may be applied to only one side of the base material, or may be applied to both sides of the base material.
• the method for drying the functional layer slurry composition on the base material is not particularly limited and any known method can be used, such as drying with warm air, hot air, low humidity air, vacuum drying, infrared rays or electron beams. Examples include drying methods using irradiation such as.
• the adhesion between the separator of the present invention and the electrode material is preferably 10 N/m or more.
• the heat shrinkage rate of the separator of the present invention is preferably 5% or less.
• the particle diameter of the organic particles was measured using a laser diffraction method. Specifically, an aqueous dispersion containing organic particles (solid content concentration 25% by mass) was used as a sample, and the particle size distribution was obtained using a laser diffraction particle size distribution measuring device (Malvern Panalytical, "Mastersizer 2000"). (on a volume basis), the particle size was determined as the particle size at which the cumulative volume calculated from the small diameter side was 50%, and was defined as the volume average particle size ( ⁇ m).
• Tg glass transition temperature
• Example 1 Synthesis of aqueous resin composition (1)
• t-butyl peroxyoctoate 1.00 g of t-butyl peroxyoctoate was dissolved in a mixed solution consisting of 121.4 g of styrene, 76.2 g of 2-ethylhexyl acrylate, and 2.4 g of 3-methacryloxypropyltrimethoxysilane. And so.
• 3.00 g of alkylbenzene sulfonate (“Neogen S-20F" manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was dissolved in 200.0 g of water.
• the above polymerizable monomer component was mixed with this aqueous solution, and T. K.
• the mixture was stirred for 10 minutes at a rotation speed of 6000 rpm using a Homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.).
• the obtained emulsion was placed in a 2 L reaction vessel equipped with a stirrer and a thermometer, and an aqueous solution of 8.0 g of polyvinyl alcohol ("44-88" manufactured by Kuraray Co., Ltd.) dissolved in 430.7 g of water was further added.
• Polymerization was carried out at 75° C. for 5 hours while stirring in a nitrogen stream. Thereafter, the temperature was raised to 85° C., and polymerization was performed for 2 hours to obtain an aqueous resin composition (1).
• the volume average particle diameter of the organic particles (A-1) in the aqueous resin composition (1) was 7.2 ⁇ m.
• Example 2 Synthesis of aqueous resin composition (2)
• An aqueous resin composition (2) was obtained in the same manner as in Example 1 except that the rotation speed of the Homomixer was changed to 3500 rpm.
• the volume average particle diameter of the organic particles (A-2) in the aqueous resin composition (2) was 9.5 ⁇ m.
• Example 3 Synthesis of aqueous resin composition (3)
• t-butyl peroxyoctoate 1.00 g was dissolved in a mixed solution consisting of 140.5 g of styrene, 57.1 g of 2-ethylhexyl acrylate, and 2.4 g of 3-methacryloxypropyltrimethoxysilane, and the polymerizable monomer component
• Aqueous resin composition (3) was obtained in the same manner as in Example 1 except that The volume average particle diameter of the organic particles (A-3) in the aqueous resin composition (3) was 6.8 ⁇ m.
• Example 4 Synthesis of aqueous resin composition (4)
• 1.00 g of t-butyl peroxyoctoate was dissolved in a mixed solution consisting of 121.4 g of methyl methacrylate, 76.2 g of 2-ethylhexyl acrylate, and 2.4 g of 3-methacryloxypropyltrimethoxysilane, and the polymerizable monomer
• An aqueous resin composition (4) was obtained in the same manner as in Example 1 except that the body component was used as a body component.
• the volume average particle diameter of the organic particles (A-4) in the aqueous resin composition (4) was 7.0 ⁇ m.
• Example 5 Synthesis of aqueous resin composition (5) Except that 1.00 g of t-butyl peroxyoctoate was dissolved in a mixed solution consisting of 121.4 g of styrene, 76.2 g of 2-ethylhexyl acrylate, and 2.4 g of ethylene glycol dimethacrylate to form a polymerizable monomer component. In the same manner as in Example 1, an aqueous resin composition (5) was obtained. The volume average particle diameter of the organic particles (A-5) in the aqueous resin composition (5) was 6.2 ⁇ m.
• the mixture was stirred for 10 minutes at a rotation speed of 8000 rpm using a Homomixer (manufactured by Tokushu Kika Kogyo Co., Ltd.).
• the obtained emulsion was placed in a 2 L reaction vessel equipped with a stirrer and a thermometer, and an aqueous solution of 8.0 g of polyvinyl alcohol ("44-88" manufactured by Kuraray Co., Ltd.) dissolved in 430.7 g of water was further added.
• Polymerization was carried out at 75° C. for 5 hours while stirring in a nitrogen stream. Thereafter, the temperature was raised to 85° C., and polymerization was performed for 2 hours to obtain an aqueous resin composition (R2).
• the volume average particle diameter of the organic particles (A-1) in the aqueous resin composition (R2) was 3.2 ⁇ m.
• ion-exchanged water 50 g of ion-exchanged water, 0.5 g of sodium dodecylbenzenesulfonate as an emulsifier, 94 g of butyl acrylate as polymerizable monomers, 2 g of acrylonitrile, 2 g of methacrylic acid, 1 g of N-hydroxymethylacrylamide, and allylglycidyl.
• a monomer mixture was obtained by supplying and mixing 1 g of ether. Polymerization was carried out by continuously adding the monomer mixture to the reactor over a period of 4 hours. Note that during the addition of the monomer mixture, the polymerization reaction was continued at a temperature of 60°C.
• the mixture was further stirred for 3 hours at a temperature of 70°C to complete the polymerization reaction, and an aqueous resin composition (R3) was obtained.
• the volume average particle diameter of the organic particles (RA-3) in the aqueous resin composition (R3) was 0.3 ⁇ m.
• the functional layer slurry was coated onto a polyethylene separator base material having a thickness of 12 ⁇ m using a bar coater so as to have a dry film thickness of 4 ⁇ m to obtain a separator having a functional layer.
• the drying temperature was 80°C and the drying time was 1 minute.
• Peel strength was measured and adhesion was evaluated as follows. Specifically, the mixture layer of the negative electrode (manufactured by Hosen Co., Ltd., HS-LIB-N-Gr-001) and the functional layer on the separator were placed opposite each other at a temperature of 80° C. and a load of 6.5 MPa. A test sample in which the negative electrode and separator were bonded together was prepared by pressing for 1 minute. This was cut out to a width of 20 mm and a height of 120 mm, double-sided tape was attached to the surface of the negative electrode, and then fixed to a metal plate with double-sided tape.
• the mixture layer of the negative electrode manufactured by Hosen Co., Ltd., HS-LIB-N-Gr-001
• a test sample in which the negative electrode and separator were bonded together was prepared by pressing for 1 minute. This was cut out to a width of 20 mm and a height of 120 mm, double-sided tape was attached to the surface of the negative electrode, and then fixed to a metal plate
• separators coated with the aqueous resin compositions of Examples 1 to 5 of the present invention had excellent adhesion to electrodes and heat shrinkage resistance.
• Comparative Examples 1 to 3 are examples in which the volume average particle diameter of the organic particles (A) is smaller than the lower limit of the present invention, but it was confirmed that the adhesion to the electrode was insufficient.

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• 2023
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