Used in lithium-sulfur batteries as a high-concentration liquid electrolyte (5M LiTFSI in DME:DOL=1:1 vol%), enabling efficient lithium-ion conduction and compatibility with sulfur cathodes and lithium metal anodes. Helps suppress polysulfide shuttle effect and dendrite formation for improved cycle life and energy density. Provides enhanced safety through reduced flammability compared to carbonate-based electrolytes. Commonly applied in next-generation batteries for electric vehicles and portable electronics.