GLYCERYL TRIESTER AS CO-SOLVENT IN LI-BATTERY ELECTROLYTE FOR HIGH VOLTAGE APPLICATION

摘要

Lithium-ion (Li-ion) batteries are the most popular energy storage devices for electronic device applications. In recent years Li-ion battery field is in constant need for high voltage and high power density for electric vehicle (EV) applications. Therefore high voltage cathode materials having high specific capacity (250 mAh/g) operating at high voltage (around 5 V vs. Li~+/Li) had been developed. However, practical application of these high-voltage materials remains hindered by the insufficient stability of conventional carbonate based electrolyte system. Ester solvents with multiple ester groups are especially attractive, due to their lower viscosity and melting points compared to cyclic carbonates. They also have higher flash point compare to common ester solvents like ethyl/methyl propionate or methyl/ethyl acetate. Presence of multiple ester groups may also form more stable solid electrolyte interface (SEI) films than those prepared from simple monoesters.