Patent ID: 8034490

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: (Ib) a non-crystalline fluorine-containing polymer having hydroxyl which has a number average molecular weight of from 500 to 1,000,000, has recurring units having, in its side chain, a structural unit D derived from a fluorine-containing ether and represented by the formula (D): -(d1) n 1 -(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, 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 is represented by the formula (1b): -(M1b)-(A)- (1b) wherein the structural unit M1b is a structural unit derived from a fluorine-containing ethylenic monomer (m1b) having hydroxyl and represented by the formula (M1b-2): wherein X 3 and X 4 are the same or different and each is H or F; X 5 is H, F, CH 3 or CF 3 ; X 6 and X 7 are the same or different and each is H, F or CF 3 ; Rf 2 is a fluorine-containing monovalent organic group having hydroxyl which has 2 to 100 carbon atoms and 1 to 4 structures of the formula (D1b): wherein R 1 is a di-, tri- or tetra-valent organic group; n5 is 0 or 1; n6 is an integer of from 1 to 3; D is as defined in the formula (D), and two or more structural units (D) are not bonded continuously to each other; a is 0 or an integer of from 1 to 3; c is 0 or 1; the structural unit A is a structural unit derived from a monomer (a) copolymerizable with the monomer (m1b), and the structural units M1b and A are contained in amounts of from 1 to 100% by mole and from 0 to 99% by mole, respectively, and (IIc) at least one selected from ionic polymers and salts thereof.