Patent ID: 8815454
Filing Date: 2014-08-26
Classification: H01M,Y02E,Y02P

Abstract:
1. A lithium secondary battery comprising: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material comprising a material capable of reversibly intercalating and deintercalating lithium ions, and a metallic material capable of alloying with lithium; a separator separating the positive electrode and the negative electrode; and an electrolyte comprising a solvent, a first additive comprising a chemical compound containing a nitrile (—CN) radical, the chemical compound containing a nitrile (—CN) radical being present in the electrolyte in a concentration of 1 to 10 weight % based on the total weight of the electrolyte, and a second additive comprising a substituted carbonate derivative represented by Formula 1, the second additive being present in the electrolyte in an amount of about 20 to about 30wt % based on the total weight of the electrolyte: wherein X is selected from the group consisting of halogens, cyano radicals (—CN), and nitro radicals (—NO