Nonaqueous electrolyte for energy storage device, nonaqueous electrolyte energy storage device, and method of producing nonaqueous electrolyte energy storage device

Abstract

A nonaqueous electrolyte for an energy storage device according to an aspect of the present invention includes an imide salt (a), a salt (b) in which a charge center element of an anion is boron and which has an oxalato group, and a difluorophosphate (c), in which a content of the imide salt (a) is 3 or more in terms of molar ratio with respect to a total content of the salt (b) in which the charge center element of the anion is boron and which has the oxalato group and the difluorophosphate (c). A nonaqueous electrolyte for an energy storage device according to another embodiment of the present invention includes an imide salt (a), a salt (b) in which a charge center element of an anion is boron and which has an oxalato group, and a difluorophosphate (c), in which a content of the imide salt (a) is 25 mol % or more with respect to a total content of all ionic compounds.

Dependencies are inferred from the claim text.