Sumitomo Chemical Company, Limited

Diazaburo Yashiki

Mitsunori Nodono

Yasuhiro Yamashita

A polymer electrolyte composition obtained by mixing a plurality of ion-conductive polymers, wherein if the ion-conductive polymer that is highest in ion exchange capacity among the plurality of ion-conductive polymers is termed first ion-conductive polymer, and the ion-conductive polymer that is lowest in ion exchange capacity is termed second ion-conductive polymer, then the first ion-conductive polymer and the second ion-conductive polymer are both block copolymers composed of a segment having an ion-exchange group and a segment having substantially no ion-exchange groups, and if the weight fraction of the segment having an ion-exchange group in the first ion-conductive polymer is termed Wh1, and the weight fraction of the segment having an ion-exchange group in the second ion-conductive polymer is termed Wh2, then the relations (I) and (II) listed below are satisfied: (I) Wh1&#x3e;Wh2; (II) Wh1&#x2212;Wh2&#x2266;0.25.

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Niihama, Japan

Diazaburo Yashiki