Patent ID: 7211203

Claim:
A polymer electrolyte comprising at least one polymer selected from the group consisting of polyimide, polyetherimide, polybenzothiazole, polybenzoxazole, polyhydantoin, polyquinoxaline, polyquinone, polyoxadiazole and polyparabanic acid; said polymer comprising a repeating structural unit having one or both of an aromatic ring and a heterocyclic ring, and a repeating structural unit represented by the formula (1): wherein X denotes a single bond, an electron-withdrawing group or an electron-donating group; R denotes a single bond or —(CH 2 ) q — where q ranges from 1 to 10; m denotes an integer of 1 to 10 and when m is from 1 to 10 Xs may be the same as or different from one another; k denotes an integer of 0 to 5; l denotes an integer of 0 to 4; and k+l≧1.