Patent ID: 8343374

Claim:
An electrolytic solution comprising a chain carbonate (I) represented by the formula (I): wherein Rf is a fluorine-containing ether group having, at its end, HCF 2 - and Rf is a fluorine-containing ether group (Ia-1) having hydrogen atom at its end and represented by the formula (Ia-1): wherein R 1 and R 2 are the same or different; R 1 is an alkylene group which has fluorine atom; R 2 is an alkylene group which optionally has fluorine atom; n1 is 1; n2 is an integer of 1 to 3; R is a fluorine-containing alkyl group which has the moiety represented by HCFX- (Ia) where X is H or F at its end and optionally has hetero atom in its chain, and a fluorine content of Rf is 30 to 76% by mass, and an electrolyte salt (II).