Patent ID: 8163422

Claim:
An electrochemical device provided with an electrolytic solution comprising: (I) a solvent for dissolving an electrolyte salt comprising: (A) a fluorine-containing ether represented by the formula (1): R f 1 —O—R f 2 wherein R f 1 and R f 2 are the same or different and each is a fluorine-containing alkyl group having 3 or 4 carbon atoms, (B) a cyclic carbonate, and (C) a chain carbonate being compatible with both of the fluorine-containing ether (A) and the cyclic carbonate (B), and (II) an electrolyte salt, said solvent (I) for dissolving an electrolyte salt comprises 30 to 60% by volume of the fluorine-containing ether (A), 3 to 40% by volume of the cyclic carbonate (B) and 10 to 67% by volume of the chain carbonate (C) based on the whole solvent (I).