Electrolyte membrane for solid polymer-type fuel cell, method for producing same, and solid polymer-type fuel cell

摘要

An object of the present invention is to provide an electrolyte membrane that suppresses swelling and shrinkage caused by water retained in the electrolyte membrane for a solid polymer-type fuel cell, improves the durability of the electrolyte membrane, and obtains excellent power generation characteristics with a low resistance. The electrolyte membrane for a solid polymer-type fuel cell includes, as a reinforcing membrane, a nonwoven fabric composed of an electrolyte material and PVDF bicomponent fibers 2a, thereby improving the durability of the electrolyte membrane. Furthermore, the bicomponent fiber 2a has pores 23 that can effectively retain generated water, thereby improving battery performance under the condition of a low humidity.

主权项

1. An electrolyte membrane for a solid polymer-type fuel cell, the electrolyte membrane comprising a reinforcing membrane of a nonwoven fabric composed of bicomponent fibers and a first electrolyte material filling voids of the reinforcing membrane,
wherein the bicomponent fibers have a cross section structure that is a sea-island structure including fibers and a second electrolyte material filling voids of the fibers, the bicomponent fibers containing pores in the sea of the second electrolyte material, the second electrolyte material is a perfluorocarbon polymer having a sulfonic group, and the fibers are composed of one of a polyvinylidene fluoride polymer, a polyvinylfluoride polymer, a copolymer composed of multiple monomer units constituting a polymer selected from a polyvinylidene fluoride polymer and a polyvinylfluoride polymer, and a mixture of these polymers.