Patent ID: 7097942

Claim:
A polymer electrolyte comprising: a fluoride copolymer represented by Formula 1: wherein R 1 , R 2 and R 3 are independently H or CH 3 , R 4 is selected from the group consisting of —C≡N, —C(═O)OCH 3 and groups represented by the following structural formulae: n is in the range of from 1 to 45, x is in the range of from 5 to 200, y is in the range of from 10 to 800, and z is in the range of from 0 to 2,000; a lithium salt selected from the group consisting of LiClO 4 , LiCF 3 SO 3 , LiPF 6 , LiN(CF 3 SO 2 ) 2 , LiBF 4 , and mixtures thereof, wherein the content of the lithium salt is in the range of from 5 to 50 parts by weight, based on 100 parts by weight of the fluoride copolymer; and polyethylene glycol dimethylether, wherein the content of the polyethylene glycol dimethylether is in the range of from 10 to 200 parts by weight, based on 100 parts by weight of the fluoride copolymer.