Patent ID: 8551652
Filing Date: 2013-10-08
Classification: H01M,Y02E

Abstract:
1. An electricity storage device comprising: a positive electrode; a negative electrode; and an electrolyte solution interposed between the positive electrode and the negative electrode, wherein: at least one of the positive electrode and the negative electrode includes: the electricity storage material contains a copolymer compound of first units and second units, each first unit having a side chain which includes an oxidation-reduction site having a π conjugate electron cloud and being of a structure represented by general formula (1′) below, and each second unit having no oxidation-reduction reaction site as a side chain, the electricity storage material reversibly undergoes redox reaction, and in general formula (1′), X the second unit includes a side chain which is a functional group having affinity with a nonaqueous solvent, the second unit includes a side chain which is at least one kind selected from the group consisting of an ester group, an ether group, a carbonyl group, a cyano group, a nitro group, a nitroxyl group, an alkyl group, a phenyl group, an alkylthio group, a sulfone group, and a sulfoxide group, the copolymer compound has a structure represented by general formula (4) below, in general formula (4), R L R M a constituent ratio m/n of a number n of first units composing the copolymer compound and a number m of second units is greater than 0 and equal to or less than 5, where n and m are integers: