A lithium bis(fluorosulfonyl)imide salt, wherein, after dissolving in water to form an aqueous solution, the aqueous solution has a pH of between 4 and 8, in particular at a temperature of 25 C., and the uses thereof in Li-ion batteries. Also, a lithium bis(fluorosulfonyl)imide salt, including a content of H+ ions of between 0.08 ppb and 0.80 ppm, between 0.08 ppb and 0.63 ppm or between 0.25 ppb and 2.53 ppb.

The present disclosure generally relates to ionic compositions which may be used in or as an adhesive material for selectively adhering two items together. More particularly, but not exclusively, the present disclosure relates to ionic compositions that include a cationic imidazolium compound and an anionic compound such as a sulfonyl imide compound.

The present invention provides a method for the production of a metal halide adduct of S.sub.4N.sub.4, in particular a specific copper adduct of S.sub.4N.sub.4, for the visualisation of a print on an object, in particular a fingerprint on a metal object. The present invention also provides a method and apparatus for visualising a print on an object, using S.sub.2N.sub.2 obtained from a metal halide adduct of S.sub.4N.sub.4.

A process for the preparation of a bis(sulphonato)imide salt of formula: (III) (SO.sub.3.sup.)N.sup.(SO.sub.3.sup.) 3C.sup.+where C.sup.+ represents a monovalent cation, comprising the reaction of amidosulphuric acid of formula: (I) (OH)SO.sub.2NH.sub.2 with a halosulphonic acid of formula: (II) (OH)SO.sub.2X where X represents a halogen atom, and comprising a reaction with a base which is a salt formed with the cation C.sup.+. Also, a process for the preparation of bis(fluorosulphonyl)imide acid of formula: (V) F(SO.sub.2)NH(SO.sub.2)F and to a process for the preparation of lithium bis(fluorosulphonyl)imide salt of formula: (VII) F(SO.sub.2)N.sup.(SO.sub.2)F Li.sup.+.

A process for the preparation of a bis(sulphonato)imide salt of formula: (III) (SO.sub.3.sup.)N.sup.(SO.sub.3.sup.) 3C.sup.+where C.sup.+ represents a monovalent cation, comprising the reaction of amidosulphuric acid of formula: (I) (OH)SO.sub.2NH.sub.2 with a halosulphonic acid of formula: (II) (OH)SO.sub.2X where X represents a halogen atom, and comprising a reaction with a base which is a salt formed with the cation C.sup.+. Also, a process for the preparation of bis(fluorosulphonyl)imide acid of formula: (V) F(SO.sub.2)NH(SO.sub.2)F and to a process for the preparation of lithium bis(fluorosulphonyl)imide salt of formula: (VII) F(SO.sub.2)N.sup.(SO.sub.2)F Li.sup.+.

A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application may comprise: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.

A method for recovering lithium bis(fluorosulfonyl)imide is provided in the present application. The method of the present application may comprise: mixing a slag from lithium bis(fluorosulfonyl)imide production process with a solvent of carbonate ester, to obtain a mixed material; subjecting the mixed material to solid-liquid separation, to obtain a discharged liquid and a solid slag; monitoring the chromaticity of the discharged liquid and comparing the chromaticity of the discharged liquid with a chromaticity reference; recycling the discharged liquid to the mixed material, if the chromaticity of the discharged liquid is higher than the chromaticity reference; and recycling the discharged liquid to lithium bis(fluorosulfonyl)imide production process, if the chromaticity of the discharged liquid is lower than or equal to the chromaticity reference.

The present invention relates to a method for producing high-purity cesium bisfluorosulfonylimide to improve stability against the explosion of a battery by forming an effective solid electrolyte interphase (SEI) layer on an electrode surface.

The present invention relates to a method for producing high-purity cesium bisfluorosulfonylimide to improve stability against the explosion of a battery by forming an effective solid electrolyte interphase (SEI) layer on an electrode surface.

The invention relates to a new method for producing an onium salt of bis(fluorosulfonyl)imide and an alkali metal salt of bis(fluorosulfonyl)imide of high purities, as industrial scale, and with a reasonable cost when compared to the other available methods. Said method comprises the steps of reacting bis(chlorosulfonyl)imide or salts thereof with an onium halide other than an onium fluoride to produce an onium salt of bis(chlorosulfonyl)imide, reacting the onium salt of bis(chlorosulfonyl)imide with an onium fluoride to produce an onium salt of bis(fluorosulfonyl)imide; the onium salt of bis(fluorosulfonyl)imide may be further reacted with an alkali metal salt to obtain an alkali metal salt of bis(fluorosulfonyl)imide.