Electrolyte for fuel cell, electrolyte membrane for fuel cell, binder for fuel cell, membrane electrode assembly for fuel cell, and fuel cell

Abstract

Disclosed is an electrolyte for fuel cells, which is mainly composed of a copolycondensate of a polyimide having an alkoxysilyl group at an end and an alkoxysilane having an ion-conducting group. Also disclosed are an electrolyte membrane for fuel cells, a binder for fuel cells and a membrane electrode assembly for fuel cells, each using the electrolyte, and a fuel cell using such a membrane electrode assembly for fuel cells. The electrolyte enables to obtain an electrolyte membrane, a binder and a membrane electrode assembly, each having high ion conductivity, high strength, high toughness, low swelling and low fuel permeability suitable for fuel cells. By using such an electrolyte, there can be obtained a low-cost fuel cell having high output power and high durability.

Dependencies are inferred from the claim text.