NON-AQUEOUS ELECTROLYTE SOLUTION AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

The present invention provides: a nonaqueous electrolyte solution which is capable of improving the storage characteristics at high temperatures and the internal resistance characteristics after storage in a more balanced manner; and a nonaqueous electrolyte secondary battery which is provided with this nonaqueous electrolyte solution. A nonaqueous electrolyte solution according to the present invention contains (I) an imide anion of general formula [1] or [2], (II) a sulfonic acid salt of general formula [3], (III) a nonaqueous organic solvent or an ionic liquid; and (IV) a solute.