To provide a solid polymer electrolyte having high proton conductivity in a wide temperature region and humidity region, and having a practically justifiable heat resistance, at a comparatively low cost, and its usage.
The solid polymer electrolyte formed by copolymerizing a phosphoric acid group-containing unsaturated monomer (A) having one or more phosphoric acid groups and one or more ethylenically unsaturated bonds in the molecule, a fluorine group-containing unsaturated monomer (B) having one or more fluorine groups and one or more ethylenically unsaturated bonds in the molecule, a sulfonic acid group-containing unsaturated monomer (C) having one or more sulfonic acid groups and one or more ethylenically unsaturated bonds in the molecule, has high proton conductivity in a wide temperature region and humidity region, and has a justifiable heat resistance in practical use.
COPYRIGHT: (C)2005,JPO&NCIPI
Masahiro Rikukawa
Yuko Takeoka
Kazuhiro Ishikawa
Yoshio Kanzaki
Itou Ito
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