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Fluorinated Aromatic Diluent for High-Performance Lithium Metal Batteries
Cited 119 time in
Web of Science
Cited 117 time in Scopus
- Authors
- Issue Date
- 2020-08
- Publisher
- John Wiley & Sons Ltd.
- Citation
- Angewandte Chemie - International Edition, Vol.59 No.35, pp.14869-14876
- Abstract
- In lithium metal batteries, electrolytes containing a high concentration of salts have demonstrated promising cyclability, but their practicality with respect to the cost of materials is yet to be proved. Here we report a fluorinated aromatic compound, namely 1,2-difluorobenzene, for use as a diluent solvent in the electrolyte to realize the "high-concentration effect". The low energy level of the lowest unoccupied molecular orbital (LUMO), weak binding affinity for lithium ions, and high fluorine-donating power of 1,2-difluorobenzene jointly give rise to the high-concentration effect at a bulk salt concentration near 2 m, while modifying the composition of the solid-electrolyte-interphase (SEI) layer to be rich in lithium fluoride (LiF). The employment of triple salts to prevent corrosion of the aluminum current collector further improves cycling performance. This study offers a design principle for achieving a local high-concentration effect with reasonably low bulk concentrations of salts.
- ISSN
- 1433-7851
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