|Title||High-Energy Rechargeable Metallic Lithium Battery at −70 °C Enabled by a Cosolvent Electrolyte|
|Publication Type||Journal Article|
|Year of Publication||2019|
|Authors||Dong, X, Lin, Y, Li, P, Ma, Y, Huang, J, Bin, D, Wang, Y, Qi, Y, Xia, Y|
|Journal||Angewandte Chemie International Edition|
|Keywords||co-solvent electrolyte, high energy density, lithium-metal batteries, low temperature|
Abstract Lithium metal is an ideal anode for high-energy rechargeable batteries at low temperature, yet hindered by the electrochemical instability with the electrolyte. Concentrated electrolytes can improve the oxidative/reductive stability, but encounter high viscosity. Herein, a co-solvent formulation was designed to resolve the dilemma. By adding electrochemically “inert” dichloromethane (DCM) as a diluent in concentrated ethyl acetate (EA)-based electrolyte, the co-solvent electrolyte demonstrated a high ionic conductivity (0.6 mS cm−1), low viscosity (0.35 Pa s), and wide range of potential window (0–4.85 V) at −70 °C. Spectral characterizations and simulations show these unique properties are associated with the co-solvation structure, in which high-concentration clusters of salt in the EA solvent were surrounded by mobile DCM diluent. Overall, this novel electrolyte enabled rechargeable metallic Li battery with high energy (178 Wh kg−1) and power (2877 W kg−1) at −70 °C.