# US 2017/0288249 A1 · Electrolyte material, liquid composition and membrane/electrode assembly for polymer electrolyte fuel cell > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288249 A1 - Document ID: US20170288249A1 - Status: Published application - Kind: A1 - Application number: 15/627,861 - Filed: 2017-06-20 - Published: 2017-10-05 - Earliest claimed: 2014-12-25 - Assignees: Asahi Glass Company, Limited - Applicants: Asahi Glass Company, Limited - Inventors: Satoru HOMMURA; Susumu Saito; Hiroyuki Watabe - Web page: https://patentgrep.com/patent/US20170288249A1 ## CPC - H01M 8/1039: halogenated, e.g. sulfonated polyvinylidene fluorides - C08F 8/12: Hydrolysis - C08F 214/184: {with fluorinated vinyl ethers} - C08J 5/2237: {containing fluorine} - C08L 29/10: Homopolymers or copolymers of unsaturated ethers (C08L35/08 takes precedence) - H01B 1/06: mainly consisting of other non-metallic substances - H01B 1/122: {Ionic conductors} - H01M 4/926: {on carbon or graphite} - H01M 8/02: Details (electrodes H01M4/86 - H01M4/98) - H01M 8/10: Fuel cells with solid electrolytes - H01M 8/1018: Polymeric electrolyte materials - C08J 2327/14: Homopolymers or copolymers of vinyl fluoride - H01M 2008/1095: {Fuel cells with polymeric electrolytes} - Y02E 60/50: Fuel cells - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract To provide a membrane/electrode assembly excellent in the power generation characteristics in a wide temperature range and a wide humidity range; an electrolyte material suitable for a catalyst layer of the membrane/electrode assembly; and a liquid composition suitable for forming a catalyst layer of the membrane/electrode assembly. To use an electrolyte material which is formed of a polymer (H) obtained by converting precursor groups in a polymer (F) having structural units (A) based on a perfluoromonomer having a precursor group represented by the formula (g1), structural units (B) represented by the formula (u2), and structural units (C) based on tetrafluoroethylene, wherein the proportion of the structural units (A) is from 8 to 19 mol %, the proportion of the structural units (B) is from 65 to 80 mol %, and the proportion of the structural units (C) is from 1 to 27 mol %, to ion exchange groups. ## Claims ### Claim at position 1 1: An electrolyte material, comprising a polymer (H) obtained by converting precursor groups in the following polymer (F) to ion exchange groups: Polymer (F): a polymer having structural units (A) based on a perfluoromonomer having a precursor group represented by the following formula (g1), structural units (B) represented by the following formula (u2), and structural units (C) based on tetrafluoroethylene, wherein the proportion of the structural units (A) is from 8 to 19 mol %, the proportion of the structural units (B) is from 65 to 80 mol %, and the proportion of the structural units (C) is from 1 to 27 mol %, in 100 mol % of all structural units: wherein: Q1 is a perfluoroalkylene group which may have an etheric oxygen atom; Q2 is a single bond or a perfluoroalkylene group which may have an etheric oxygen atom; Y is a fluorine atom or a monovalent perfluoro organic group; each of R11 and R12 which are independent of each other, is a fluorine atom or a C1-5 perfluoroalkyl group; and each of R13 and R14 which are independent of each other, is a fluorine atom, a C1-5 perfluoroalkyl group or a C1-5 perfluoroalkoxy group. ### Claim at position 2 (depends on 1) 2: The electrolyte material according to claim 1, wherein the proportion of the structural units (A) is from 13 to 18 mol %, the proportion of the structural units (B) is from 67 to 78 mol %, and the proportion of the structural units (C) is from 4 to 20 mol %, in 100 mol % of all structural units constituting the polymer (F). ### Claim at position 3 (depends on 1) 3: The electrolyte material according to claim 1, wherein the following TQ value of the polymer (F) is from 250 to 330° C.: TQ value: a temperature at which the extrusion rate becomes 100 mm3/sec, when the polymer (F) is subjected to melt-extrusion under an extrusion pressure condition of 2.94 MPa from a nozzle having a length of 1 mm and an inner diameter of 1 mm. ### Claim at position 4 (depends on 1) 4: The electrolyte material according to claim 1, wherein the ion exchange capacity of the polymer (H) is from 0.7 to 1.29 meq/g dry resin. ### Claim at position 5 (depends on 1) 5: The electrolyte material according to claim 1, wherein at least one type of structural units (A′) obtained by converting precursor groups of the structural units (A) to ion exchange groups is structural units represented by the following formula (u′1): wherein: Rf is a perfluoroalkyl group which may have an etheric oxygen atom; X is an oxygen atom, a nitrogen atom or a carbon atom, such that a=0 when X is an oxygen atom, a=1 when X is a nitrogen atom, and a=2 when X is a carbon atom; and q is 0 or 1. ### Claim at position 6 (depends on 1) 6: The electrolyte material according to claim 1, wherein each of Q1 and Q2 which are independent of each other, is a C1-6 perfluoroalkylene group which may have an etheric oxygen atom. ### Claim at position 7 (depends on 6) 7: The electrolyte material according to claim 6, wherein at least one of Q1 and Q2 is a C1-6 perfluoroalkylene group having an etheric oxygen atom. ### Claim at position 8 (depends on 1) 8: The electrolyte material according to claim 1, wherein at least one type of the structural units (B) is structural units represented by the follo ### Claim at position 9 (depends on 1) 9: A liquid composition, comprising a dispersion medium and the electrolyte material as defined in claim 1, dispersed in the dispersion medium, wherein the dispersion medium comprises an organic solvent having a hydroxy group. ### Claim at position 10 (depends on 9) 10: The liquid composition according to claim 9, comprising from 1 to 50 mass % of the electrolyte material. ### Claim at position 11 (depends on 1) 11: A catalyst layer in an electrode of a membrane/electrode assembly for a polymer electrolyte fuel cell, the catalyst layer comprising a proton conductive polymer formed of the electrolyte material of claim 1. ### Claim at position 12 (depends on 1) 12: A membrane/electrode assembly for a polymer electrolyte fuel cell, the membrane/electrode assembly comprising an anode having a catalyst layer containing a proton conductive polymer, a cathode having a catalyst layer containing a proton conductive polymer, and a polymer electrolyte membrane disposed between the anode and the cathode, wherein the proton conductive polymer contained in the catalyst layer of at least one of the cathode and the anode is the electrolyte material of claim 1.