Patent ID: 7824810

Claim:
An electrolytic solution comprising (a) an ethylene sulfide, (b) a vinylene carbonate, (c) a LiPF 6 , and (d) a compound represented by a Chemical formula 1: where, R11 represents a —C(═O)—R21-C(═O)-group; R21 represents an alkylene group, an alkylene halide group, an arylene group, or an arylene halide group, or a —C(═O)—C(═O)-group; R12 represents a halogen group, an alkyl group, an alkyl halide group, an aryl group, or an aryl halide group; each of X11 and X12 represent oxygen (O) or sulfur (S); M11 represents a transition metal element, a 313 Group element, a 413 Group element, or a 513 Group element in the short period periodic table; M21 represents an IA Group element or a 2A Group element in the short period periodic table or aluminum (Al); a represents an integer number from 1 to 4; b represents an integer number from 0 to 8m; and each of c, d, e and f represent an integer number from 1 to 3, wherein, the ethylene sulfide content is in the range from 0.1 wt % to 3 wt %, the vinylene carbonate content is in the range from 0.1 wt % to 5 wt %, the LiPF 6 content is in the range from 10 wt % to 18 wt %, and the content of the light metal salt shown in Chemical formula 1 is in the range from 0.025 wt % to 1 wt %.