# US 2020/0399458 A1 · Binder composition for non-aqueous secondary battery electrode and method of producing same, slurry composition for non-aqueous secondary battery electrode, electrode for non-aqueous secondary battery, and non-aqueous secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0399458 A1 - Document ID: US20200399458A1 - Status: Published application - Kind: A1 - Application number: 16/975,709 - Filed: 2019-03-05 - Published: 2020-12-24 - Earliest claimed: 2018-03-07 - Assignees: Zeon Corporation - Applicants: Zeon Corporation - Inventors: Tetsuya AKABANE; Hiroto KIDOKORO; Karin HOTTA - Web page: https://patentgrep.com/patent/US20200399458A1 ## CPC - C08L 51/003: {grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence)} - C08F 287/00: Macromolecular compounds obtained by polymerising monomers on to block polymers - C08F 297/046: {polymerising vinyl aromatic monomers and isoprene, optionally with other conjugated dienes} - C08L 51/006: {grafted on to block copolymers containing at least one sequence of polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds} - H01M 4/622: {being polymers} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - Y02E 60/10: Energy storage using batteries - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Provided is a binder composition for a non-aqueous secondary battery electrode that can form an electrode having excellent peel strength and a secondary battery having excellent cycle characteristics. The binder composition for a non-aqueous secondary battery electrode contains a hindered phenol antioxidant and a particulate polymer formed of a graft polymer that includes a hydrophilic graft chain and that is obtained through a graft polymerization reaction of 1 part by mass to 40 parts by mass, in total, of either or both of a hydrophilic monomer and a macromonomer with 100 parts by mass of core particles containing a block copolymer that includes an aromatic vinyl block region formed of an aromatic vinyl monomer unit and an isoprene block region formed of an isoprene unit, and in which proportional content of the isoprene block region is 70 mass % to 99 mass %. ## Claims ### Claim 1 A binder composition for a non-aqueous secondary battery electrode comprising: a particulate polymer formed of a graft polymer that includes a hydrophilic graft chain and that is obtained through a graft polymerization reaction of not less than 1 part by mass and not more than 40 parts by mass, in total, of either or both of a hydrophilic monomer and a macromonomer with 100 parts by mass of core particles containing a block copolymer that includes an aromatic vinyl block region formed of an aromatic vinyl monomer unit and an isoprene block region formed of an isoprene unit, and in which proportional content of the isoprene block region is not less than 70 mass % and not more than 99 mass %; and a hindered phenol antioxidant. ### Claim 2 (depends on 1) The binder composition for a non-aqueous secondary battery electrode according to claim 1, further comprising a phosphite antioxidant. ### Claim 3 (depends on 1) The binder composition for a non-aqueous secondary battery electrode according to claim 1, further comprising a metal trapping agent. ### Claim 4 (depends on 1) The binder composition for a non-aqueous secondary battery electrode according to claim 1, wherein the particulate polymer has a median diameter of not less than 0.6 μm and not more than 2.5 μm. ### Claim 5 (depends on 1) The binder composition for a non-aqueous secondary battery electrode according to claim 1, wherein the hydrophilic graft chain includes an acidic group, and the particulate polymer has a surface acid content of not less than 0.02 mmol/g and not more than 1.0 mmol/g. ### Claim 6 (depends on 1) The binder composition for a non-aqueous secondary battery electrode according to claim 1, further comprising a particulate binder, wherein the particulate binder is formed of either or both of a styrene-butadiene copolymer and an acrylic polymer. ### Claim 7 (depends on 6) The binder composition for a non-aqueous secondary battery electrode according to claim 6, wherein content of the particulate polymer is not less than 50 mass % and not more than 90 mass % of total content of the particulate polymer and the particulate binder. ### Claim 8 (depends on 1) A slurry composition for a non-aqueous secondary battery electrode comprising: an electrode active material; and the binder composition for a non-aqueous secondary battery electrode according to claim 1. ### Claim 9 (depends on 8) An electrode for a non-aqueous secondary battery comprising an electrode mixed material layer formed using the slurry composition for a non-aqueous secondary battery electrode according to claim 8. ### Claim 10 (depends on 9) A non-aqueous secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution, wherein at least one of the positive electrode and the negative electrode is the electrode for a non-aqueous secondary battery according to claim 9. ### Claim 11 (depends on 1) A method of producing a binder composition for a non-aqueous secondary battery electrode that is a method of producing the binder composition for a non-aqueous secondary battery electrode according to claim 1, comprising: a step of obtaining core particles by emulsifying a mixture containing a hindered phenol antioxidant, an aqueous medium, and a solution of a block copolymer that includes an aromatic vinyl block region formed of an aromatic vinyl monomer unit and an isoprene block region formed of an isoprene unit, and in which proportional content of the isoprene block region is not less than 70 mass % and not more than 99 mass %; and a step of obtaining a particulate polymer formed of a graft polymer by providing the core particles with a hydrophilic graft chain. ### Claim 12 (depends on 11) The method of producing a binder composition for a non-aqueous secondary battery electrode according to claim 11, wherein the mixture further contains a phosphite antioxidant. ### Claim 13 (depends on 11) The method of producing a binder composition for a non-aqueous secondary battery electrode according to claim 11, wherein the mixture further contains a metal trapping agent. ### Claim 14 (depends on 11) The method of producing a binder composition for a non-aqueous secondary battery electrode according to claim 11, wherein the mixture further contains a coupling agent, and the solution of the block copolymer, the hindered phenol antioxidant, the aqueous medium, and the coupling agent are mixed to obtain the mixture before the emulsifying. ### Claim 15 (depends on 11) The method of producing a binder composition for a non-aqueous secondary battery electrode according to claim 11, further comprising a step of adding a coupling agent to an emulsion containing the core particles between the step of obtaining the core particles and the step of obtaining the particulate polymer.