Patent ID: 7553589

Claim:
A fluorine-containing polymer solid electrolyte which has an ionic conductivity of from 10 −10 to 10 1 S/cm measured at 25° C. by alternating current complex impedance method and comprises: (I) a non-crystalline fluorine-containing polymer which has a polar nonionic functional group Y and has recurring units having, in a side chain thereof, a structural unit D derived from a fluorine-containing ether and represented by the formula (D): -(d1) n1 -(d2) n2 -(d3) n3 -(d4) n4 - wherein (d1) is —(OCF 2 CF 2 CF 2 )—, (d2) is —(OCFX 1 CF 2 )— or —(OCF 2 CFX 1 )—, (d3) is —(OCFX 2 )—, (d4) is —(OCH 2 CF 2 CF 2 )— or —(OCF 2 CF 2 CH 2 )—; n1, n2, n3 and n4 are the same or different and each is 0 or an integer of 1 or more, provided that n1+n2+n3+n4 is an integer of from 1 to 4; X 1 and X 2 are the same or different and each is F or CF 3 ; in the side chain, two or more structural units (D) are not bonded continuously to each other, and (II) an electrolytic compound.