Patent ID: 7713658

Claim:
A material for electrolytic solutions which comprises, as an essential constituent, an anion represented by the general formula (1) and an onium cation: wherein X represents at least one element selected from among B, N, O, Al, Si, P, S, As, and Se; M 1 and M 2 are the same or different and each represents an organic linking group selected from the group consisting of —S—, —O—, —SO 2 — and —CO 2 ; a is an integer of not less than 1, b is 0, c is 0 and d is an integer of not less than 0, and wherein said onium cation is selected from the group consisting of wherein R is a C 1 -C 8 alkyl group and each of R 1 to R 12 independently is a hydrogen atom, a cyano group, a sulphone group or a C 1 -C 8 hydrocarbon group.