Electrolyte Additive in Support of 5 V Li Ion Chemistry

An electrolyte additive based on highly fluorinated phosphate ester structure was identified as being able to stabilize carbonate-based electrolytes on class cathode surfaces. The synthesis and structural analysis of the additive are described, and preliminary yet encouraging results from electrochemical characterization showed that this additive participates in forming a protective interphasial chemistry not only on transition metal oxide cathode at high voltage ( vs Li) but also on graphitic graphite at low voltage ( vs Li), making it possible to formulate an electrolyte supporting reversible -intercalation chemistry in the coveted region.