. . "y way of a polymerization reaction to form a polymer matrix as the ion conductor structural body wherein R1 and R2 is, respectively, H or an alkyl group of 2 or fewer carbon atoms, A is a group comprising at least a polyether group, and R3 is a group having at least an alkyl group of 6 or more carbon atoms, wherein a weight ratio of the solvent to the polymer matrix is from 1 to 20, and wherein a" . . . . .