Patent ID: 8524400
Filing Date: 2013-09-03
Classification: H01M,Y02E,Y02T

Abstract:
1. A secondary battery comprising a cathode, an anode and an electrolyte comprising an electrolyte salt and an electrolyte solvent, the electrolyte comprising both a lactam-based compound and a sulfinyl group-containing compound, wherein the lactam-based compound and the sulfinyl group-containing compound have the difference tolerance of 0 to 0.7V in reduction potentials vs. Li + /Li wherein the lactam-based compound is represented by the following Formula 1: wherein n is a number of 3-11, and X is selected from the group consisting of a hydrogen atom, C1-C10 alkyl group, C2-C10 alkenyl group, an electron withdrawing group (EWG)-substituted alkyl or alkenyl group, and an electron withdrawing group(EWG); and the sulfinyl group-containing compound is selected from the group consisting of sulfone, sulfite, sulfonate and sultone; wherein the sulfone is represented by Formula 2; the sulfite is represented by Formula 3; and the sulfonate is represented by Formula 4 wherein each of R