A study of perfluorocarboxylate ester solvents for lithium ion battery electrolytes

摘要: Abstract 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) dimethyl perfluoroglutarate (PF5M2) (ionic conductivity = 1.87 × 10−2 mS cm−1), is Si thin-film half-cells. solid-electrolyte-interphase (SEI) formed the PF5M2 composed of similar organic inorganic moieties at comparable concentrations those ethylene carbonate/dimethyl carbonate electrolytes containing LiPF6 LiTFSI salts. However, SEI undergoes reversible electrochemical defluorination, contributing to capacity cell compensating part for fade electrode. While far from ideal these provide an opportunity further develop predictions suitable fluorinated molecules use battery solvents.