Lithium bis(trifluoromethanesulfonyl)imide solution

Lithium bis(trifluoromethanesulfonyl)imide in ethylene carbonate and dimethylcarbonate, 1.0 M LiTFSI in EC/DMC/EMC=1:1:1 (w/w/w) is a solution of battery-grade LiTFSI dissolved in a ternary mixture of EC/DMC/EMC (1:1:1) 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/EMC=1:1:1 (w/w/w) is as an electrolyte in lithium-ion batteries (LIBs). LiTFSI-based electrolytes have advantages over LiPF₆-based electrolytes because they are less sensitive to hydrolysis, safer to handle, and are more stable thermally and electrochemically. Ethylene carbonate (EC) is known to form a stable, conductive solid electrolyte interphase (SEI) with many cathode anode materials, including graphite. Ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) have lower viscosities and melting points than EC, and when mixed with EC result in an electrolyte with a good balance between desirable electrochemical properties, high dielectric constant, and low viscosity. The product is suitable for different comparative studies in lithium-ion batteries such as ionic conductivities, redox properties, flammability of electrolytes etc.