Patent ID: 8241795

Claim:
An electrolytic solution comprising: a solvent containing a sulfone compound shown in Chemical formula 1 an electrolyte salt, wherein R1 represents a halogen group, —O—R4, —S—R4, —O—SiR5 3 , or —S—SiR5 3 , R2 is a halogen group, —O—R6, —S—R6, —S—SiR7 3 , or —O—SiR7 3 , wherein R3 consists of carbon and flourine, wherein R4 and R6 are an alkyl group with the carbon number in the range from 1 to 4 or an alkyl halide group with the carbon number in the range from 1 to 4, wherein R5 and R7 are an alkyl group with the carbon number in the range from 1 to 4, an alkylene group with the carbon number in the range from 1 to 4, or an aryl group, and wherein R4, R6, R5 and R7 may be identical or different.