The present disclosure relates to a method for preparing salts of bis(fluorosulfonyl)imide and to a method for preparing alkali metal salts of bis(fluorosulfonyl)imide from said bis(fluorosulfonyl)imide salts. More specifically, the invention provides a new method for producing these salts of bis(fluorosulfonyl)imide which is implementable at industrial scale and providing high-purity bis(fluorosulfonyl)imide salts.

The present invention provides a method for producing a fluorisulfonylimide salt, which enables reducing the impurity content and continuous operation for a long time, and a fluorosulfonyl imide salt. The fluorosulfonyl imide salt of the present invention has a K content of 10,000 ppm or less. The method for producing a fluorosulfonyl imide salt of the present invention is that after a fluorination reaction of chlorosulfonyl imde or a salt thereof, the reaction solution is brought into contact with an aqueous alkaline solution so as to remove impurities. The fluorosulfonyl imide salt of the present invention, in which various impirities are reduced to extremely low levels, is useful as an electrolyte used in a lithium secondary battery, a capacitor or the like, an ionic liquid, or an intermediate for a sulfonyl imide salt, and the like. It is expected that use of the fluorosulfonyl imide salt of the present invention as an electrolyte leads to a high-performance electrochemical device.

The present invention relates to a process for manufacturing a bis(chlorosulfonyl)imide (HCSI) of ultra-pure (UP) grade with a purity of at least 99.0 mol. % with respect to the total number of moles of HCSI. In addition, the present invention relates to an HCSI of UP grade obtainable from the process, and to the use of the HCSI of UP grade for preparing a lithium bis(fluorosulfonyl)imide (LiFSI). The present invention also relates to a process for manufacturing a LiFSI comprising the preparation of an HCSI of UP grade according to the present process. The present invention relates to a composition comprising a LiFSI with a purity of at least 99.99 mol. % with respect to the total number of moles of LiFSI in the composition, and to the use of a composition comprising a LiFSI obtainable from the present process in a lithium-ion secondary battery.

The present invention relates to a process for preparing a fluorosulfony limide salt. More specifically. the present invention relates to a process for preparing lithium bis(fluorosulfonyl)imide (LiFSI).

The present invention relates to a process for preparing a fluorosulfony limide salt. More specifically. the present invention relates to a process for preparing lithium bis(fluorosulfonyl)imide (LiFSI).

A method of producing purified bis(fluorosulfonyl) imide includes providing a liquid mixture including bis(fluorosulfonyl) imide and fluorosulfonic acid and then contacting the liquid mixture with gaseous ammonia. The gaseous ammonia reacts with the fluorosulfonic acid to produce ammonium fluorosulfate. The method further includes separating the liquid mixture from the ammonium fluorosulfate.

A method of producing purified bis(fluorosulfonyl) imide includes providing a liquid mixture including bis(fluorosulfonyl) imide and fluorosulfonic acid and then contacting the liquid mixture with gaseous ammonia. The gaseous ammonia reacts with the fluorosulfonic acid to produce ammonium fluorosulfate. The method further includes separating the liquid mixture from the ammonium fluorosulfate.

The present invention relates to a composition comprising an alkali metal salt of bis(fluorosulfonyl)imide and to the use of such composition in an electrolyte for batteries.

The present invention relates to a composition comprising an alkali metal salt of bis(fluorosulfonyl)imide and to the use of such composition in an electrolyte for batteries.

The present invention provides a process for producing hydrogen bis(fluorosulfonyl)-imide (HFSI) by fluorination of a liquid hydrogen bis(chlorosulfonyl)imide (HCSI) using a gaseous hydrogen fluoride. In some embodiments, HFSI that is produced is separated from the reaction mixture as a gas and is condensed to collect a liquid HFSI.