Patent ID: 7682736

Claim:
An electrochemical device, comprising: a case; a nonaqueous electrolyte filled in the case and containing a room temperature molten salt in an amount of not smaller than 1% to not larger than 50% by volume, the room temperature molten salt containing a cation represented by formula (1) or formula (2) given below; a first electrode housed in the case; and a second electrode housed in the case and containing a substance having a lamellar crystal structure, where R 1 denotes a substituent including a carbonic acid ester group; and each of R 2 and R 3 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, or R 2 and R 3 are combined to denote a substituent having a cyclic structure and having not less than 4 to not more than 5 carbon atoms; where R 4 denotes a substituent including a carbonic acid ester group, R 5 denotes a substituent having an acyclic structure and having 4 or less carbon atoms, and R 6 denotes a hydrogen atom or a methyl group; wherein R 1 and R 4 denotes a substituent represented by formula (4) given below: where m is 0 or 1, and R 8 denotes a hydrogen atom.