Patent ID: 6878492

Claim:
A solid polymer electrolyte comprising a polymer compound having a branched carbonate structure represented by formula (1) as a partial structure and at least one electrolyte salt: wherein each R 1 and R 2 independently represents a hydrogen atom, a linear, branched or cyclic alkyl group having from 1 to 10 carbon atoms, a linear, branched or cyclic alkoxy group having from 1 to 10 carbon atoms or a linear, branched or cyclic alkoxyalkyl group having from 1 to 10 carbon atoms, m represents an integer of 3 to 10, n represents an integer of 1 to 500, and each R 1 and R 2 and each value of m and n can be the same or different, provided that R 1 or R 2 present in plurality within the same molecule are not a hydrogen atom at the same time.