The present invention provides (1) a sulfone compounds having a propargyl group, (2) a nonaqueous electrolytic solution for lithium secondary batteries, which comprises an electrolyte salt dissolved in a nonaqueous solvent and contains a sulfone compound having a specific structure that has an SO2 group with a propargyl group or a vinyl group bonding thereto, in an amount of from 0.01 to 10 % by weight of the nonaqueous electrolytic solution, and which can prevent gas generation and is excellent in battery characteristics such as cycle property and the like, and (3) a lithium secondary battery comprising a positive electrode, a negative electrode and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution contains a sulfone compound having a specific structure, in an amount of from 0.01 to 10 % by weight of the nonaqueous electrolytic solution.
本发明提供了(1)一种具有
丙炔基的砜化合物;(2)一种用于
锂二次电池的非
水性电解溶液,它包括溶解在非
水性溶剂中的电解质盐,并含有一种具有特定结构的砜化合物,该化合物具有一个带有
丙炔基或
乙烯基的SO2基团,其用量为0.(3)
锂二次电池,包括正极、负极和溶解在非
水溶剂中的电解质盐的非
水电解溶液,其中非
水电解溶液含有具有特定结构的砜化合物,其用量为非
水电解溶液重量的 0.01至10%(按非
水电解溶液重量计)。