Fluoroethylene carbonate

Fluorinated ethylene carbonate is a lithium battery electrolyte additive that can be used in Lithium-ion battery electrolytes. It is mainly used in the field of battery material research for Lithium-ion secondary batteries assembled with cathodes and anodes and battery separators. It can act as both a solvent and an additive. As a solvent, its relative dielectric constant is as high as 102, which is higher than EC, which is conducive to the good dissociation of lithium salts. Its melting point is about 10 degrees lower than EC. In addition, its molecular structure contains fluorine atoms, which is conducive to the infiltration of the battery system, which is very beneficial to the battery capacity and low-temperature performance. Due to the good oxidation resistance of the fluorine-containing structure, FEC is also commonly used in high-voltage systems. Its dosage is often used from 3% to 10%, but large-scale use will bring higher viscosity, higher cost and more serious high-temperature instability (HF is easily removed at high temperatures). Sometimes, in order to suppress its instability of decomposition at high temperatures, other additives need to be added to suppress its negative effects.