Sulfamides and Glymes as Aprotic Solvents for Lithium Batteries

In view of the high reactivity of the lithium metal, lithium batteries must operate in an aprotic environment, which can either be a conducting polymer, a liquid solvent, or a mixture of them. Two families of aprotic liquids were considered as solvents for lithium bis(trifluoromethylsulfone)imide ( or LiTFSI). The first one is the substituted sulfamides, , where the R groups are either methyl, ethyl, or methoxyethyl , and the second one is the glymes, , for n up to 10. The phase diagrams, potential windows, conductivities, and the lithium interfacial resistances of the solutions were investigated, often as a function of temperature. The potential use of these solvents for different types of batteries is discussed.