An electrolytic solution comprising N-(fluorosulfonyl)-N-(fluoroalkylsulfonyl)imide or di(fluorosulfonyl)imide, from which a residual solvent that affects the properties of the electrolyte solution material is reduced, is provided. A method for producing an electrolyte solution material containing fluorosulfonyl imide salt represented by the following general formula (1) and an electrolyte solution preparation solvent comprises decompressing and/or heating a solution containing the fluorosulfonyl imide salt and the electrolyte solution preparation solvent to volatilize a production solvent for the fluorosulfonyl imide salt.

##STR00001##

In general formula (1), R.sub.1 represents a fluorine atom or a fluorinated alkyl group having 1 to 6 carbon atoms, R.sub.2 represents an alkali metal ion.

An electrolytic solution comprising N-(fluorosulfonyl)-N-(fluoroalkylsulfonyl)imide or di(fluorosulfonyl)imide, from which a residual solvent that affects the properties of the electrolyte solution material is reduced, is provided. A method for producing an electrolyte solution material containing fluorosulfonyl imide salt represented by the following general formula (1) and an electrolyte solution preparation solvent comprises decompressing and/or heating a solution containing the fluorosulfonyl imide salt and the electrolyte solution preparation solvent to volatilize a production solvent for the fluorosulfonyl imide salt.

##STR00001##

In general formula (1), R.sub.1 represents a fluorine atom or a fluorinated alkyl group having 1 to 6 carbon atoms, R.sub.2 represents an alkali metal ion.

The invention relates to a process for manufacturing bis(fluoro sulfonyl)imide salt(s) (MFSI) comprising at least a step of reacting an ammonium salt of bis(fluorosulfonyl)imide (NH.sub.4FSI) with a fluorine-containing alkoxide. The invention also relates to a process for preparing the fluorine-containing alkoxide.

The invention relates to a process for manufacturing bis(fluoro sulfonyl)imide salt(s) (MFSI) comprising at least a step of reacting an ammonium salt of bis(fluorosulfonyl)imide (NH.sub.4FSI) with a fluorine-containing alkoxide. The invention also relates to a process for preparing the fluorine-containing alkoxide.

The present disclosure relates to a dry dispersion of ammonium bis(fluorosulfonyl)imide (NH.sub.4FSI) salt of formula (I): [FSO.sub.2N.sup.SO.sub.2F], NH.sub.4.sup.+ (I) characterized by having at least two particle size fractions, i.e. a small-size fraction and a large-size fraction. The present disclosure also relates to the use of such dispersion to prepare a salt of bis(fluorosulfonyl)imide selected from the group consisting of a lithium slat, a sodium salt or a potassium salt.

The present disclosure relates to a dry dispersion of ammonium bis(fluorosulfonyl)imide (NH.sub.4FSI) salt of formula (I): [FSO.sub.2N.sup.SO.sub.2F], NH.sub.4.sup.+ (I) characterized by having at least two particle size fractions, i.e. a small-size fraction and a large-size fraction. The present disclosure also relates to the use of such dispersion to prepare a salt of bis(fluorosulfonyl)imide selected from the group consisting of a lithium slat, a sodium salt or a potassium salt.

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.

Methods for preparing electrolyte salts for alkaline earth metal-ion batteries (e.g., calcium and magnesium ion batteries) are described. The electrolyte salts comprise alkaline earth metal (e.g., Mg or Ca) salts of bis(fluorosulfonyl)imide (FSI) and 3,4-dicyano-2-trifluoromethylimidazole (TDI). The methods comprise contacting FSI or TDI with an alkaline earth metal bis(trifluoroacetate) salt in trifluoroacetic acid.

Methods for preparing electrolyte salts for alkaline earth metal-ion batteries (e.g., calcium and magnesium ion batteries) are described. The electrolyte salts comprise alkaline earth metal (e.g., Mg or Ca) salts of bis(fluorosulfonyl)imide (FSI) and 3,4-dicyano-2-trifluoromethylimidazole (TDI). The methods comprise contacting FSI or TDI with an alkaline earth metal bis(trifluoroacetate) salt in trifluoroacetic acid.

The present invention provides an industrially advantageous method for producing bis(halosulfonyl)amine that makes it possible to inhibit the rapid generation of gas and reduce the amount of halogenating agent used by controlling the reaction rate among sulfamic acid, the halogenating agent and a halosulfonic acid to nearly a constant rate from the initial stage to the final stage of the reaction. The method for producing bis(halosulfonyl)amine of the present invention allows the obtaining of a bis(halosulfonyl)amine such as N-(fluorosulfonyl)-N-(chlorosulfonyl)amine or bis(chlorosulfonyl)amine by a production method that includes heating a mixture containing sulfamic acid and a halosulfonic acid to a temperature higher than room temperature, adding a halogenating agent thereto, and allowing to react while adjusting to a prescribed temperature.