PURIFIED LITHIUMBIS (FLUOROSULFONYL) IMID (LIFSI) PRODUCTS, METHODS OF PURIFYING RAW LIFSI, AND USES OF PURIFIED LIFSI PRODUCTS

摘要

Method for removing target impurities from a crude lithium bis (fluorosulfonyl) imide (LiFSI) to produce a purified LiFSI product. In some embodiments, a purification method includes contacting crude LiFSI with a first anhydrous organic solvent to produce a solution containing LiFSI and the target impurity (s), wherein the LiFSI is soluble and the impurity (s) are im Is / are essentially insoluble. In some embodiments, a second anhydrous organic solvent is added to the solution to precipitate the target impurity (s), which are then filtered to obtain a filtrate. In some embodiments, solvent is removed from the filtrate to obtain a solid mass containing LiFSI, which can then be contacted with a third anhydrous organic solvent in which the LiFSI is insoluble. The LiFSI can then be isolated from the third anhydrous organic solvent to obtain the purified LiFSI product. Also disclosed are purified LiFSI products and electrochemical devices using purified LiFSI products, among others.