A study of perfluorocarboxylate ester solvents for lithium ion batteryn electrolytes

摘要

Several high-purity methyl perfluorocarboxylates were prepared (>99.5% purity by mole) and investigated as potential fluorine-rich electrolyte solvents in Li-ion batteries. The most conductive electrolyte, 0.1 M lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in dimethyl perfluoroglutarate (PF5M(2)) (ionic conductivity = 1.87 x 10(-2) mS cm(-1)), is investigated in Si thin-film half-cells. The solid-electrolyteinterphase (SEI) formed by the PF5M(2) electrolyte is composed of similar organic