ELECTROLYTE SOLUTION, ELECTROCHEMICAL DEVICE, LITHIUM-ION SECONDARY BATTERY, AND MODULE

The disclosure provides an electrolyte solution capable of improving the high-temperature cycle characteristics of an electrochemical device. The electrolyte solution contains a compound (1) represented by the formula (I), (wherein R and R are each individually a substituent such as a C1-C7 alkyl group, and the substituent optionally contains at least one divalent to hexavalent hetero atom in a structure or optionally has a structure obtained by replacing at least one hydrogen atom by a fluorine atom or a C0-C7 functional group) and at least one compound (11) selected from the group consisting of compounds such as a compound represented by the formula (11) (wherein R and R are the same as or different from each other and are each a hydrogen atom or the like, and R is an alkyl group free from a fluorine atom or the like).