Patent ID: 8546024
Filing Date: 2013-10-01
Classification: H01M,Y02E,Y02T

Abstract:
1. A lithium secondary battery comprising an anode made of carbon material capable of occluding or emitting lithium ions, a cathode made of lithium-containing oxide, a separator between the anode and the cathode, and a non-aqueous electrolyte, wherein the non-aqueous electrolyte comprises: a lithium salt; a non-linear carbonate-based mixed organic solvent consisting of (a) a cyclic carbonate compound expressed by the following Chemical Formula 1 and (b) a propionate-based ester compound expressed by the following Chemical Formula 3, wherein (a) and (b) are mixed at a volume ratio (a:b) in the range from about 10:90 to about 70:30, and optionally (c) a vinylene carbonate expressed by the following Chemical Formula 2; and an inhibitor against a reaction between the anode and the propionate-based ester compound in which the inhibitor is selected from the group consisting of a cyclic acid anhydride, a compound having a cyclic S═O group, and an acrylate-based compound, and an amount of the inhibitor against the reaction between the anode and the propionated-base ester compound is about 1 to 10 weight % based on the total weight of the non-aqueous electrolyte, wherein the cathode has a current density in the range from 3.5 to 5.5 mA/cm Chemical Formula 1 where R3 to R6 are independently any one selected from the group consisting of a hydrogen, fluorine, and an alkyl group having a carbon number of 1 to 4, respectively, where R7 and R8 are independently a hydrogen or an alkyl group having a carbon number of 1 to 4 respectively, and where R