NONAQUEOUS ELECTROLYTE SOLUTION FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY USING THE SAME

摘要

Disclosed is (1) a sulfone compound having a propargyl group. Also disclosed is (2) a nonaqueous electrolyte solution for lithium secondary batteries, which is obtained by dissolving an electrolyte in a nonaqueous solvent, which nonaqueous electrolyte solution contains 0.01-10% by weight of a sulfone compound having a specific structure containing a propargyl group or an SOgroup bonded with a vinyl group relative to the nonaqueous electrolyte solution. This nonaqueous electrolyte solution is excellent in suppression of gas generation and battery characteristics such as cycle characteristics. Further disclosed is (3) a lithium secondary battery composed of a positive electrode, a negative electrode and a nonaqueous electrolyte solution obtained by dissolving an electrolyte salt in a nonaqueous solvent. This lithium secondary battery is characterized by containing a sulfone compound having a specific structure in the electrolyte solution in an amount of 0.01-10% by weight relative to the weight of the nonaqueous electrolyte solution.