Enhanced Electrochemical Performance of Lithium Metal Batteries with Fluorine Doped SO2 Based Nonflammable Inorganic Electrolytes

Abstract

With the demands for high energy density of lithium ion batteries(LIBs), replacing conventional anode of LIBs with lithium metal provide a great opportunity to overcome the limits of batteries because of their high-energy-density. However, utilizing lithium metal in battery system has problems like uncontrollable lithium dendrite growth during lithium plating/stripping and unstable solid electrolyte interface(SEI) on lithium metal which can cause short circuit of batteries. Fluorine is one of the well-known components to stabilize SEI layer in the battery system using commercial organic electrolytes. In this presentation, we introduce lithium metal batteries(LMBs) based fluorine doped LiAlCl4-xFx-3SO2 nonflammable inorganic liquid electrolyte to achieve stable SEI and uniform deposition of lithium. Compare to non-doped LiAlCl4-3SO2 electrolyte, the fluorine doped SO2 based inorganic electrolyte show much alleviated overpotential during cycling. We will show how fluorine doping in electrolytes impact the electrochemical performance of LMBs with SO2 based inorganic liquid electrolytes. Detailed reaction mechanism of our battery system with fluorine doped LiAlCl4-xFx-3SO2 nonflammable inorganic liquid electrolyte will be discussed in the presentation.