Lithium bis(trifluoromethanesulfonyl)imide solution

Lithium bis(trifluoromethanesulfonyl)imide in ethylene carbonate and dimethylcarbonate, 1.0 M LiTFSI in EC/DMC=25/75 (w/w) is a solution of battery-grade LiTFSI dissolved in binary mixture of EC/DMC (25:75) wt%. The product is a clear solution with strictly minimized impurities including low moisture (≤100 ppm), low trace metals (≤10 ppm Na and K), low chloride (<10 ppm), and low sulfate (<10 ppm).

The main application of 1.0 M LiTFSI in EC/DMC=25/75 (w/w) is as an electrolyte in Li-ion batteries. Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt is a promising alternative to LiPF₆ since LiTFSI is more stable chemically and thermally than LiPF₆. In particular, LiTFSI is less sensitive to hydrolysis than LiPF₆, which hydrolyzes to hydrofluoric (HF) acid. Electrolytes based on a blend of ethylene carbonate (EC) and dimethyl carbonate (DMC) are known to be more conductive ionically than the EC/DEC counterpart. Experimentally, using Walden rule, it has been observed that 1.0M LiTFSI in EC/DMC is more conductive ionically than 1.0 M LiPF₆ in the same binary solvent.