# US 2014/0193741 A1 · Polymer electrolyte membrane for fuel cell, membrane electrode assembly and fuel cell including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0193741 A1 - Document ID: US20140193741A1 - Status: Published application - Kind: A1 - Application number: 14/115,838 - Filed: 2012-06-05 - Published: 2014-07-10 - Earliest claimed: 2011-06-16 - Assignees: LG Chem, Ltd. - Inventors: Kyung A. Sung; Hyuk Kim; Seong Ho Choi; Sang Woo Lee; Tae Geun Noh; Do Young Kim; Min Kyu Min - Web page: https://patentgrep.com/patent/US20140193741A1 ## CPC - H01M 8/1051: Non-ion-conducting additives, e.g. stabilisers, SiO2 or ZrO2 - D01D 5/40: by applying a shearing force to a dispersion or solution of filament formable polymers, e.g. by stirring - D01F 2/00: Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof - D01F 2/24: from cellulose derivatives - D01F 2/28: from organic cellulose esters or ethers, e.g. cellulose acetate - H01M 8/1023: having only carbon, e.g. polyarylenes, polystyrenes or polybutadiene-styrenes - H01M 8/1039: halogenated, e.g. sulfonated polyvinylidene fluorides - H01M 8/1053: consisting of layers of polymers with at least one layer being ionically conductive - H01M 8/1058: characterised by a porous support having no ion-conducting properties - 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 - D01D: MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS - D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Disclosed are a polymer electrolyte membrane for fuel cells and a membrane electrode assembly and fuel cell including the same. The polymer electrolyte membrane includes a fluorine-based cation exchange resin having proton conductivity and fibrous nanoparticles having a hydrophilic group. By using the fluorine-based cation exchange resin having proton conductivity and the fibrous nanoparticles having a hydrophilic group in combination, performance of a fuel cell including the polymer electrolyte membrane is not deteriorated and the polymer electrolyte membrane prevents gases from permeating thereinto and has enhanced durability for extended use. A fuel cell including the above-described polymer electrolyte membrane is provided. ## Claims ### Claim 1 A polymer electrolyte membrane for fuel cells, comprising a fluorine-based cation exchange resin having proton conductivity and fibrous nanoparticles having a hydrophilic group. ### Claim 2 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fluorine-based cation exchange resin having proton conductivity and the fibrous nanoparticles having a hydrophilic group are mixed in a weight ratio of 99.9:0.1 to 95:5. ### Claim 3 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fibrous nanoparticles having a hydrophilic group are prepared using a microfluidizer. ### Claim 4 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fibrous nanoparticles having a hydrophilic group have a diameter of 1 to 200 nm and a length of 1 to 20 μm. ### Claim 5 (depends on 4) The polymer electrolyte membrane according to claim 4, wherein the diameter of the fibrous nanoparticles having a hydrophilic group is between 10 and 200 nm. ### Claim 6 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fibrous nanoparticles having a hydrophilic group have an aspect ratio of 1:5 to 1:2,000. ### Claim 7 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fibrous nanoparticles having a hydrophilic group are cellulose-based nanofibers. ### Claim 8 (depends on 7) The polymer electrolyte membrane according to claim 7, wherein a hydroxyl group of the cellulose-based nanofibers is present in an amount of 5 to 90% with respect to a total site of the hydroxyl group. ### Claim 9 (depends on 7) The polymer electrolyte membrane according to claim 7, wherein the cellulose-based nanofibers are at least one selected from the group consisting of cellulose nanofibers, hydroxyl groups of which are unsubstituted, cellulose nanofibers substituted with an acetyl group or a derivative thereof, cellulose sulfate nanofibers, cellulose phosphate nanofibers, and cellulose nanofibers substituted with a C1-C10 alkyl group or a derivative thereof. ### Claim 10 (depends on 9) The polymer electrolyte membrane according to claim 9, wherein the cellulose-based nanofibers are at least one selected from the group consisting of cellulose nanofibers, hydroxyl groups of which are unsubstituted, cellulose nanofibers substituted with an acetyl group or a derivative thereof, cellulose sulfate nanofibers, cellulose phosphate nanofibers, and cellulose nanofibers substituted with a C2-C6 alkyl group or a derivative thereof. ### Claim 11 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fluorine-based cation exchange resin having proton conductivity is a polymer having, at a side chain thereof, at least one cation exchange group selected from the group consisting of a sulfonic acid group, a carboxylic acid group, a phosphoric acid group, a phosphonic acid group, and derivatives thereof. ### Claim 12 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fluorine-based cation exchange resin having proton conductivity is a perfluorosulfonic acid resin. ### Claim 13 (depends on 1) The polymer electrolyte membrane according to claim 1, wherein the fluorine-based cation exchange resin having proton conductivity comprises a fluorine-based one in an amount of 30 to 99 wt % based on a total weight of the fluorine-based cation exchange resin having proton conductivity. ### Claim 14 (depends on 1) The polymer electrolyte membrane according to claim 1, further comprising at least two cation exchange resin membranes having proton conductivity stacked opposite to each other with the polymer electrolyte membrane disposed therebetween. ### Claim 15 (depends on 1) A membrane electrode assembly for fuel cells, comprising an anode, a cathode facing the anode, and the polymer electrolyte membrane according claim 1 disposed therebetween. ### Claim 16 (depends on 15) A fuel cell comprising: at least one electricity generator comprising the membrane electrode assembly according to claim 15 and at least one separator and generating electricity through electrochemical reaction of a fuel and an oxidizing agent; a fuel feeder to feed the fuel to the electricity generator; and an oxidizing agent feeder to feed the oxidizing agent to the electricity generator.