Method for producing bis(fluorosulfonyl)imide lithium salt (LiFSI) with reduced fluorine anion content by using alkoxy trialkyl silane
US11987496B2 · kind B2 · utility
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Key dates
| Filing date | Sep 4, 2019 |
| Grant date | May 21, 2024 |
| Priority date | — |
| Expiry date | Apr 20, 2041 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a bis(fluorosulfonyl)imide lithium salt is disclosed. The method includes the steps of: (a) reacting bis(chlorosulfonyl)imide with NH4F(HF)n (n=0-10) to prepare ammonium bis(fluorosulfonyl)imide; and (b) reacting the ammonium bis(fluorosulfonyl)imide with a lithium base, wherein in at least one of steps (a) and (b), after the reaction, a process of adding an alkoxy trialkyl silane to the reaction solution to remove a fluorine anion is performed.
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