ACETONITRILE ELECTROLYTE SOLUTION CONTAINING HIGH-CONCENTRATION METAL SALT, AND SECONDARY BATTERY COMPRISING SAID ELECTROLYTE SOLUTION

摘要

[Problem] The present invention addresses the problem of providing a novel electrolyte solution system for lithium secondary batteries.[Solution] An electrolyte solution for lithium secondary batteries, which contains acetonitrile and LiN(SO₂F)₂, and which is characterized in that the molar volume concentration of the LiN(SO₂F)₂ in the electrolyte solution is 3.0 mol/L or more.