POLYELECTROLYTE COMPOSITION, POLYELECTROLYTE MEMBRANE, MEMBRANE ELECTRODE ASSEMBLY, AND SOLID POLYMER ELECTROLYTE FUEL CELL

摘要

This invention provides a polyelectrolyte composition, a polyelectrolyte membrane, a membrane electrode assembly, a solid polymer electrolyte fuel cell and the like. The solid polymer electrolyte fuel cell comprises a membrane electrode assembly comprising a gas diffusion electrode joined to both sides of a polyelectrolyte membrane. A perfluoro-type membrane having high chemical stability has hitherto been used as the polyelectrolyte membrane. When the fuel cell is used for automobiles, operation under high-temperature low-humidity conditions of a temperature around 100°C and humidification at 50°C has been desired. The perfluoro-type membrane, however, has suffered from problems such as unsatisfactory durability. The fuel cell according to the present invention has solved the above problems, for example, by forming a polyelectrolyte membrane using a composition containing a polyelectrolyte having an ion exchange capacity of 0.5 to 3.0 milliequivalents/g, a compound containing a thioether group, and an azole ring-containing compound in respective specific contents.