Li-Ion Electrolytes Containing Flame-Retardant Additives

In order to improve the safety and performance of lithium- ion cells, especially over a wide operating temperature range, a number of Li-ion electrolytes have been developed that contain flame-retardant additives in conjunction with fluorinated co-solvents to provide a safe, wide-operating-temperature- range system. Previously, fluorinated esters were incorporated into multi-component electrolyte formulations and their performances have been demonstrated over a wide temperature range (–60 to +60 °C). The fluorinated esters co-solvents were employed due to their favorable properties and improved safety characteristics, mainly associated with their low flammability associated with their halogenated nature.