Patent ID: 7579401

Claim:
A solid polymer electrolyte comprising an electrolyte salt, and a copolymer in which a block chain A containing a repeating unit represented by a formula (I) shown below: (wherein, R 1 to R 3 each represent, independently, a hydrogen atom or a hydrocarbon group of C1 to C10, R 1 and R 3 may be bonded together to form a ring, R 4a and R 4b each represent, independently, a hydrogen atom or a methyl group, R 5 represents a hydrogen atom, a hydrocarbon group, an acyl group, or a silyl group, m represents an integer from 10 to 100, and individual R 4a and R 4b groups are either identical or different), a block chain B containing a repeating unit represented by a formula (II) shown below: (wherein, R 6 to R 8 each represent, independently, a hydrogen atom or a hydrocarbon group of C1 to C10, and R 9 represents an aryl group), and a block chain C containing a repeating unit represented by a formula (III) shown below: (wherein, R 10 to R 12 each represent, independently, a hydrogen atom or a hydrocarbon group of C1 to C10, and R 13 represents an aryl group or a heteroaryl group) are arranged in a sequence B, A, C, wherein the copolymer exhibits a microphase separated structure.