Alkali metal salt of fluorosulfonyl imide, and production method therefor

摘要

The present invention provides an alkali metal salt of fluorosulfonyl imide having favorable heat resistance and a reduced content of specific impurities and a water content, and provides a method for producing an alkali metal salt of fluorosulfonyl imide, which is capable of easily removing a solvent from a reaction solution. An alkali metal salt of fluorosulfonyl imide of the present invention is represented by the following general formula (I) and has a mass loss rate of 2% or less when the alkali metal salt of fluorosulfonyl imide is kept at 100° C. for 8 hours under an air current. A method for producing an alkali metal salt of fluorosulfonyl imide of the present invention comprises a step of concentrating a solution of the alkali metal salt of fluorosulfonyl imide by bubbling a gas into a reaction solution containing the alkali metal salt of fluorosulfonyl imide, and/or concentrating a solution of the alkali metal salt of fluorosulfonyl imide by thin layer distillation.;

主权项

1. A composition comprising an alkali metal salt of fluorosulfonyl imide represented by the following formula (I), having a content of sulfate ions (SO42−) of 3,000 ppm or less,wherein in the formula (I), Ma represents an alkali metal, and Ra and Rb are the same or different and represent a fluorine atom, or a alkyl group having 1 to 6 carbon atoms in which one or more hydrogen atoms are substituted with a fluorine atom, and at least one of Ra or Rb is a fluorine atom.