Patent ID: 6872493

Claim:
A nonaqueous electrolytic solution having an electrolyte salt dissolved in an organic solvent, which contains a silicon compound having an unsaturated bond which is represented by formula (I): wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each represent an alkyl group, an alkoxy group, an alkenyl group, an alkenyloxy group, an alkynyl group, an alkynyloxy group, an aryl group or an aryloxy group, each of which may have an ether bond in the chain thereof; n represents a number of from 0 to 5; when n is 1 to 5, X represents a single bond, an oxygen atom, an alkylene group, an alkylenedioxy group, an alkenylene group, an alkenylenedioxy group, an alkynylene group, an alkynylenedioxy group, an arylene group or an arylenedioxy group; provided that at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and X represents a group containing an unsaturated bond, an organotin compound or an organogermanium compound, and wherein said silicon compound is represented by formula (I) wherein X is an ethynylene group.