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

Abstract

An electrolyte solution including a solvent, the solvent containing a compound (1a) represented by the following formula (1a); and a compound (2) represented by the following formula (2): wherein Re is a C1-C5 linear or branched alkyl group optionally containing an ether bond; Rf is a C1-C5 linear or branched alkyl group optionally containing an ether bond; and at least one of Re or Rf contains a fluorine atom. 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 or the lithium-ion secondary battery.

Dependencies are inferred from the claim text.