The improvement of rechargeable lithium battery electrolyte performance with additives

The deliberate introduction of additives like 2-methylfuran (2-MeF) is known to improve Li cycleability in cyclic ether electrolytes. The authors found that the proclivity of 2-MeF to polymerize in the bulk electrolyte or on a TiS/sub 2/ cathode was inhibited by the addition of reduced oxygen species, such as O/sub 2//sup -//int and OH. Additionally, the polymerization of tetrahydrofuran and dioxolane and the destructive processes initiated by AsF/sub 6//sup -/ decomposition to AsF/sub 5/ and AsF/sub 3/ were inhibited by the introduction of reduced oxygen species, particularly OH/sup -/ at the 10 p.p.m. to 100 p.p.m. level.<>