Patent ID: 7824578

Claim:
An electrolyte for batteries, which comprises: (a) an electrolyte salt; (b) an electrolyte solvent; and (c) a sulfonate-based compound containing at least one electron withdrawing group (EWG) selected from the group consisting of a cyano group (—CN), an isocyanate group (—NCO), a thiocyanate group (—SCN) and an isothiocyanate group (—NCS), wherein the sulfonate-based compound is a compound represented by the following Formula I: wherein R 1 is a C2˜C10 alkenyl; and R 2 is a functional group selected from the group consisting of a C1˜C10 alkyl group, alkenyl group, aryl group and phenyl group containing at least one substituent selected from a cyano group, an isocyanate group, a thiocyanate group and an isothiocyanate group.