Electrolyte composition, solid electrolyte membrane, solid polymer fuel cell and manufacturing method for solid electrolyte membrane

摘要

An electrolyte composition that shows low methanol cross-over and exhibits high proton conductivity when used as a solid electrolyte for solid polymer fuel cells or the like, and a solid electrolyte membrane and a solid polymer fuel cell that use the electrolyte composition are provided. This electrolyte composition comprises a perfluorocyclobutane-containing polymer having a specific structure. High proton conductivity is provided by sulfonic acid groups connected to the benzene rings. Reduction of methanol crossover is realized by introduction of a rigid structure with aromatic rings, or a combination o a rigid structure with aromatic rings and a three-dimensional cross-linked structure.

主权项

1. A solid polymer fuel cell comprising a solid electrolyte membrane, wherein said solid electrolyte membrane is made from an electrolyte composition comprising an organic solvent and a perfluorocyclobutane-containing polymer comprising a structural unit represented by formula (1),(in formula (1), Ar1is a structural unit represented by formula (2) or (3)),(in formulae (2) and (3), Z's are, independent from each other, F or CF3; m's are, independent from each other, an integer of not less than 0 on each benzene ring; and n's are, independent from each other, an integer of not less than 1); and
said solid electrolyte membrane is formed by a method comprising applying the electrolyte composition onto a substrate, and then, removing the solvent.