Patent ID: 7727677
Filing Date: 2010-06-01
Classification: H01M,Y02E

Abstract:
1. A nonaqueous electrolyte solution for lithium secondary batteries, in which an electrolyte salt is dissolved in a nonaqueous solvent, the nonaqueous electrolyte solution comprising 0.01 to 10% by weight of a carboxylate compound represented by the formula (I) shown below, and 0.01 to 10% by weight or 0.01 to 10% by volume of at least one selected from the group consisting of a vinylene carbonate and 1,3-propane sultone: wherein R 1 represents a C 1 to C 12 alkyl group which may be branched, a C 3 to C 8 cycloalkyl group, a C 2 to C 12 alkenyl group which may be branched, a C 2 to C 12 alkynyl group which may be branched, or an unsubstituted or substituted phenyl group, R 2 represents a hydrogen atom or a COOR 3 group where R 3 represents a C 1 to C 12 alkyl group which may be branched, a C 3 to C 8 cycloalkyl group, a C 2 to C 12 alkenyl group which may be branched, a C 2 to C 12 alkynyl group which may be branched, or an unsubstituted or substituted phenyl group, and X represents a C 2 to C 4 alkynylene group.