Nonaqueous electrolyte solution and lithium secondary battery using same

Abstract

A non-aqueous electrolyte solution is provided that realizes a large capacity, exhibits high storage characteristics and cycle characteristics, and is capable of inhibiting gas generation. The non-aqueous electrolyte solution comprises a lithium salt; at least one non-aqueous solvent selected from the group consisting of a chain carbonate, a cyclic carbonate, a chain carboxylic acid ester, a cyclic carboxylic acid ester, a chain ether, and a cyclic ether; and a compound expressed by the following formula (II)a wherein R-Rindependently of each other, represent a hydrogen atom, an alkyl group having 1-12 carbon atoms that may be substituted by a fluorine atom, an alkenyl group having 1-12 carbon atoms that may be substituted by a fluorine atom, an aryl group having 6-12 carbon atoms that may be substituted by a fluorine atom, or an aralkyl group having 7-12 carbon atoms that may be substituted by a fluorine atom, wherein each group R-Rmay have an ether linkage in its chain, and Rmay be linked with R, and Rmay be linked with R, to form a ring, said ring optionally comprising an oxygen atom.