NONAQUEOUS ELECTROLYTE FOR LITHIUM SECONDARY BATTERIES HAVING ENHANCED CYCLE PERFORMANCE AND LITHIUM SECONDARY BATTERIES COMPRISING THE SAME

摘要

A nonaqueous electrolyte solution for a lithium secondary battery, and lithium secondary battery containing the nonaqueous electrolyte solution are provided to improve initial charge/discharge characteristics and high temperature lifetime characteristics. A nonaqueous electrolyte solution comprise a silane-based additive represented by X_n SiY_(4-n), wherein n is 1-3; X is CH2=CH-, CH2=(CH3)COOC3H6-, HN2C3H6-, NH2C2H4NHC3H6-, NH2COCHC3H6-, CH3COOC2H4NHC2H4NHC3H6-, NH2C2H4NHC2H4NHC3H6-, SHC3H6-, ClC3H6-, CH3-, CH2H5-, C2H5OCONHC3H6-, OCNC3H6-, C6H5-, C6H5CH2NHC3H6-, C3H5NC3H6-, H- or a halogen atom; and Y is an alkyl, alkoxy, acetoxy or cycloalkyl group capable of being substituted with a halogen atom, an aryl group, an aralkyl group or a phenyl group, a phenyl capable of being substituted with a halogen atom, -OC2H4OCH3, -Si(CH3)3, -OSi(CH3)3, -OSi(CH3)2H, -O(CH2CH2O)mCH3; -N(CH3)2 or a halogen atom; m is 1-10, but the case that X is CH2=CH- and Y is -OC2H4OCH3 is excluded.