Method for producing lithium bis(fluorosulfonyl)imide salt

A fluorosulfonyl and chlorosulfonyl technology, applied in the field of manufacturing bis-imide lithium salts, can solve problems such as reducing service life, destroying battery operation and performance, and damaging equipment structural integrity.

Pending Publication Date: 2021-01-12
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, the excessive presence of metal ions in LFSI can disrupt the operation and performance of the battery, for example due to the deposition of said metal ions on the battery electrodes
Furthermore, corrosion of the materials used for the equipment impairs the structural integrity of the equipment and reduces its useful life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0015] According to one embodiment, the material M1 comprises:

[0016] - i) at least 60% by weight of iron relative to the total weight of material M1, preferably at least 70% by weight, advantageously at least 75% by weight, even more advantageously at least 80% by weight, more preferably at least 85% by weight, especially is at least 90% by weight, more particularly at least 95% by weight, and even more preferably at least 97% by weight iron; and

[0017] ii)

[0018] - less than 2% by weight of carbon relative to the total weight of material M1, advantageously less than 1.5% by weight, preferably less than 1% by weight, more preferably less than 0.75% by weight, especially less than 0.5% by weight, more particularly less than 0.2% by weight % by weight, beneficially less than 0.1% by weight of carbon; and / or

[0019] - less than 3% by weight of molybdenum, advantageously less than 2% by weight, preferably less than 1.5% by weight, preferably less than 1.25% by weight, mo...

no. 2 approach

[0266] According to a second embodiment, step (e) comprises the steps of:

[0267] i') optionally dissolving LiFSI in organic solvent OS1;

[0268] i) performing liquid-liquid extraction of a lithium salt of bis(fluorosulfonyl)imide with deionized water, and recovering an aqueous solution of said lithium salt of bis(fluorosulfonyl)imide;

[0269] ii) optionally concentrating said aqueous solution of said salt;

[0270] iii) liquid-liquid extraction of the lithium salt of bis(fluorosulfonyl)imide from said aqueous solution with at least one organic solvent OS2;

[0271]iv) Concentrating the lithium salt of bis(fluorosulfonyl)imide by evaporating the organic solvent OS2

[0272] v) Optionally crystallizing the lithium salt of bis(fluorosulfonyl)imide.

[0273] Preferably, at least one of steps i), ii), iii) or iv) is carried out in the following:

[0274] - Silicon carbide-based or fluoropolymer-based devices; or

[0275] - A device made of steel, preferably carbon steel, c...

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Abstract

The present invention relates to a method for producing bis (fluorosulfonyl) imide salt F (SO2) NLi (SO2) F, comprising a step (a) of chlorinating sulfamate HO (SO2) NH2 to obtain bis (chlorosulfonyl)imide Cl (SO2) NH (SO2) Cl. The step (a) is carried out in a reactor made of a corrosion-resistant material M3, or in a reactor comprising a base layer made of a material M1 coated with a surface layer made of a corrosion-resistant material M2.

Description

technical field [0001] The present invention relates to a process for the manufacture of lithium salts of bis(fluorosulfonyl)imides. Background technique [0002] For the Li-ion battery market, higher power batteries need to be developed. This is done by increasing the nominal voltage of the Li-ion battery. In order to achieve the target voltage, a high-purity electrolyte is required. Due to their very low basicity, sulfonimide-type anions are increasingly used in the field of energy storage (in the form of inorganic salts in batteries, or in the form of organic salts in supercapacitors) or in ionic liquids middle. [0003] In the specific field of Li-ion batteries, the most widely used salt is LiPF 6 . This salt has many disadvantages, such as limited thermal stability, susceptibility to hydrolysis and thus poorer battery safety. Recently, FSO with fluorosulfonyl group has been studied 2 – and it has exhibited many advantages such as better ion conductivity and resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/02H01M10/052C01B21/086C01B21/093C01B21/096
CPCC01B21/086C01B21/0935C01B21/096B01J19/02B01J2219/0213B01J2219/0236B01J2219/0245B01J2219/0286B01J2219/029H01M10/0568H01M10/0525H01M10/0567Y02E60/10B01J19/0066B01J2219/0259B01J2219/0277
Inventor P.勒杜克G.施密特D.杜尔-伯特
Owner ARKEMA FRANCE SA
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