A new route to the syntheses of alkali metal bis(fluorosulfuryl)imides: Crystal structure of LiN(SO2F)2

Liquid electrolyte based on lithium bis-fluorosulfonyl imide salt: Aluminum corrosion studies and lithium ion battery investigations

“…The LiFSI was synthesized by a procedure similar to that of Beran and Prihoda [7], with the exception that LiBF 4 was used in place of LiClO 4 for the ion exchange with K(SO 2 F) 2 N. The potassium salt was first obtained by the reaction of NH(SO 2 Cl) with anhydrous KF. The purity of the potassium salt, characterized by its IR spectrum in Fig.…”

“…The DSC scan of LiFSI salt, in Fig. 2, shows a single peak at 132 • C attributed to its melting point [7].…”

Recent progresses on electrolytes of fluorosulfonimide anions for improving the performances of rechargeable Li and Li-ion battery

“…For those salts of FSI À anion with relatively small volume cation, i.e., Li + and Na + , it is almost impossible to completely remove the solvent with high donor number (DN) from these salts by conventional evaporation on heating and/or under reduced pressure without product decomposition, because of the strong coordinating ability of Li + and Na + cations with solvent [23]. This would be the exact reason why solvent-free LiFSI and NaFSI should be prepared in solvents with low donor number, such as, CH 3 NO 2 (DN = 2.7 [24]) and CH 3 CN (DN = 14.1 [24]).…”

“…Additionally, solvent-free LiFSI and NaFSI can be obtained by a metathesis reaction between KFSI and the corresponding perchlorate (LiClO 4 or NaClO 4 ) in a low donor number solvent of CH 3 NO 2 (DN = 2.7 [24], reactions (10)) [23]. Since the by-product of potassium perchlorate (KClO 4 ) is explosive, this process is not suitable for commercial scale synthesis.…”

An improved high-power battery with increased thermal operating range: C–LiFePO4//C–Li4Ti5O12

“…LiFSI was first claimed as conducting salt with good anticorrosive properties for Li-ion batteries in 1995 [70], but this salt is difficult to prepare with the high purity that is mandatory for its use in Li-ion batteries [71]. Now that that this problem has been overcome [72,73], this salt has a considerable interest because of its thermal behavior, stability toward hydrolysis, and ionic transport behavior [74]: it is thermally stable up to 200 C, exhibits far superior stability toward hydrolysis than LiPF 6 , shows a conductivity that is larger than that of LiTFSI.…”