High-Energy Rechargeable Metallic Lithium Battery at -70 °C Enabled by a Cosolvent Electrolyte.
Angew Chem Int Ed Engl
; 58(17): 5623-5627, 2019 Apr 16.
Article
em En
| MEDLINE
| ID: mdl-30821403
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 (0.6â
mS cm-1 ), low viscosity (0.35â
Pa s), and wide range of potential window (0-4.85â
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 (178â
Wh kg-1 ) and power (2877â
W kg-1 ) at -70 °C.
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MEDLINE
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Ano de publicação:
2019
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Article