ELECTROLYTIC SOLUTION, ELECTROCHEMICAL DEVICE, LITHIUM ION SECONDARY BATTERY, AND MODULE

摘要

The present invention aims to provide an electrolyte solution for forming, for example, a secondary battery having excellent oxidation resistance and high voltage cycle characteristics; an electrochemical device such as a lithium-ion secondary battery that contains the electrolyte solution; and a module that contains the electrochemical device. The present invention provides an electrolyte solution containing a solvent and an electrolyte salt, wherein the solvent contains a fluorine-containing compound (A) represented by formula (1) shown below, and a fluorine-containing compound (B) represented by formula (2) shown below:;Rf1OCOOR  (1);wherein Rf1 is a C1-C4 fluorine-containing alkyl group, and R is a C1-C4 non-fluorinated alkyl group, and;Rf2OCOORf3  (2);wherein Rf2 and Rf3 are the same or different, and each is a C1-C4 fluorine-containing alkyl group.

主权项

1. An electrolyte solution comprising:
a solvent; and an electrolyte salt, the solvent containing a fluorine-containing compound (A) represented by formula (1) shown below and a fluorine-containing compound (B) represented by formula (2) shown below:
Rf1OCOOR  (1)wherein Rf1 is a C1-C4 fluorine-containing alkyl group, and R is a C1-C4 non-fluorinated alkyl group, and
Rf2OCOORf3  (2)wherein Rf2 and Rf3 are the same or different, and each is a C1-C4 fluorine-containing alkyl group.