METHOD FOR PURIFYING AQUEOUS SULFONYLIMIDE SOLUTION

A method for purifying an aqueous sulfonylimide solution includes heating an aqueous sulfonylimide solution containing a sulfonylimide compound represented by the general formula (1). A method for producing a non-aqueous electrolyte solution includes adding an electrolyte solution solvent to the aqueous sulfonylimide solution purified by the purification method to dehydrate the aqueous sulfonylimide solution. A method for producing an electrolyte composition includes distilling off the electrolyte solution solvent from the non-aqueous electrolyte solution obtained by the production method. [0002] LiN(RSO)(FSO) (where R represents a fluorine atom, an alkyl group with 1 to 6 carbon atoms, or a fluoroalkyl group with 1 to 6 carbon atoms) (1)