Patent ID: 8007679

Claim:
An electrolytic solution comprising a chain carbonate (I) and an electrolyte salt (II), wherein the chain carbonate (I) is represented by the formula (I): wherein Rf 1 is a fluorine-containing ether group having CF 3 end group and represented by the formula (Ia-1): CF 3 (R 1 n1 OR 2 n2 (Ia-1) wherein R 1 is an alkylene group optionally containing fluorine atom; R 2 is a fluorine-containing alkylene group; n1 is 0 or 1; n2 is an integer of 1 to 3; Rf 2 is a fluorine-containing alkyl group having a CF 3 end group or a fluorine-containing ether group having CF 3 or CH 3 end group.