How To Prepare Lithium Bis(trifluoromethanesulfonimide)imide(LiTFSI) Safely And Efficiently?

Lithium bistrifluoromethanesulfonimide,referred to as LiTFSI is an important lithium battery electrolyte material, and the conductivity of LiTFSI is suitable, and It has high thermal stability and high electrochemical stability; it has a small probability of side reaction and does not produce corrosive gases such as HF. At the same time, LiTFSI also has a wide range of applications as catalysts and ionic liquids. 

With the continuous development of the lithium battery industry,its market demand will become larger and larger.So, the safe and efficient  preparation method  of LiTFSI is of great significance.

However, in the past, the preparation method  of LiTFSI  has the disadvantages of difficult raw materials control, high safety risks, and low yield.

Based on this, Feng Jin ,  Kai Wang and others have developed a new production method  ,which is simple, safe, efficient, and environmentally friendly. The preparation method comprises the following steps:

First, dissolve benzyl bis-trifluoromethylsulfonamide in an organic solvent. Under the action of concentrated sulfuric acid, remove benzyl group to obtain bis-trifluoromethylsulfonamide; Under the condition of organic solvent, ion exchange with lithium resin to obtain the final product bistrifluoromethanesulfonimide lithium salt (LiTFSI).

 According to the method, raw materials are low in price and easy to obtain, reaction procedures are simple, the yield is high, nearly no pollution is caused, rigid and dangerous reaction conditions are avoided, the product is easy to purify, and the method is suitable for large-scale production in China.

Related Links: Lithium Bis-trifluoromethanesulfonimide (LiTFSI)

Reference: Preparation method of bistrifluoromethane sulfonimide lithium salt CN105949093B