Lithium-ion electrolytes with improved safety tolerance to high voltage systems

摘要

The invention discloses various embodiments of electrolytes for use in lithium-ion batteries, the electrolytes having improved safety and the ability to operate with high capacity anodes and high voltage cathodes. In one embodiment there is provided an electrolyte for use in a lithium-ion battery comprising an anode and a high voltage cathode. The electrolyte has a mixture of a cyclic carbonate of ethylene carbonate (EC) or mono-fluoroethylene carbonate (FEC) co-solvent, ethyl methyl carbonate (EMC), a flame retardant additive, a lithium salt, and an electrolyte additive that improves compatibility and performance of the lithium-ion battery with a high voltage cathode. The lithium-ion battery is charged to a voltage in a range of from about 2.0 V (Volts) to about 5.0 V (Volts).

主权项

1. An electrolyte comprising a mixture of:
ethylene carbonate (EC); ethyl methyl carbonate (EMC) or dimethyl carbonate (DMC); a flame retardant additive; a lithium salt comprising lithium hexafluorophosphate (LiPF6); and, an electrolyte additive, wherein the electrolyte additive comprises lithium bis(oxalato) borate (LiBOB); wherein the electrolyte comprises 1.0M lithium hexafluorophosphate (LiPF6) in 20% by volume ethylene carbonate (EC) plus 65% to 70% by volume ethyl methyl carbonate (EMC) plus 10% to 15% by volume of the flame retardant additive of triphenyl phosphate (TPhPh/TPP/TPPa) plus 0.15M lithium bis(oxalato) borate (LiBOB).