Electrolyte, electrochemical device, lithium ion secondary battery, and module

Abstract

An electrolyte solution containing LiFSO3 and a compound (1) represented by the following formula (1): LiZ, wherein Z is PF6, BF4, N(FSO2)2, N(CF3SO2)2, N(C2F5SO2)2, PO2F2, or B(C2O4)2. The electrolyte solution has a ratio [FSO3]/[Z] of a molar content of FSO3 [FSO3] to a molar content of Z [Z] of 3 to 1000. Also disclosed is an electrochemical device including the electrolyte solution, a lithium ion secondary battery including the electrolyte solution and a module including the electrochemical device.

Dependencies are inferred from the claim text.