Fluorinated High-Voltage Electrolyte: Synergetic Effect of Solvents and Additives
A new HVE containing fluorinated carbonates was evaluated against LNMO cathode and showed excellent oxidative stability. Several additives were found to form solid-electrolyte interphase (SEI) layers that effectively prevented significant decomposition of the HVE on the graphite anode. Cell performance was evaluated at both ambient and elevated temperatures. The fluorinated HVE exhibited much improved performance compared with conventional non-fluorinated carbonate-based electrolyte especially at high temperature. Cycling results and electrochemical impedance spectroscopy (EIS) data clearly demonstrated the synergetic effect of the fluorinated solvents and the SEI forming additives.