Patent ID: 8809602

Claim:
An electrolyte comprising: an acid used as a supporting electrolyte; and iodine molecules, wherein: the supporting electrolyte contains the acid only; the acid has a concentration of not less than 0.01 mol/L but not more than 19.0 mol/L; the acid is at least one selected from the group consisting of: sulphonic acids and phosphoric acids, the sulphonic acids are represented by the following General Formula (1): R 1 SO 3 H (1) (where: R 1 is one selected from the group consisting of a hydroxyl group, a C 1-6 alkyl group, a phenyl group, and a naphthyl group; in the alkyl group, a hydrogen atom may be substituted with a fluorine atom; the phenyl group and the naphthyl group may have a substituent group); and the phosphoric acids being represented by the following General Formula (2): (where: R 2 and R 3 are identically or differently a hydrogen atom, a C 1-10 alkyl group, or a phenyl group; and the phenyl group may have a substituent group).