Patent ID: 7851090

Claim:
An organic electrolytic solution comprising: a lithium salt; an organic solvent comprising a first solvent having high permittivity and a second solvent having a low boiling point; and a phosphine oxide compound represented by Formula 1: where l is 1, n is 0 or 1 and each of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 is independently selected from the group consisting of C1 to C20 unsubstituted alkyl groups, C1 to C20 halogen substituted alkyl groups, C6 to C30 unsubstituted aryl groups, C6 to C30 halogen substituted aryl groups, C2 to C30 unsubstituted heteroaryl groups, and C2 to C30 halogen substituted heteroaryl groups, wherein the phosphine oxide compound is present in an amount ranging from about 0.5 to about 20 wt % based on the total weight of the organic solvent.