Non-Flammable Ester Electrolyte with Boosted Stability Against Li for High-Performance Li metal Batteries
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(Published version)
Date
2022
Authors
Wang, Z.
Wang, Y.
Li, B.
Bouwer, J.C.
Davey, K.
Lu, J.
Guo, Z.
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Journal article
Citation
Angewandte Chemie International Edition, 2022; 61(41):e202206682-1-e202206682-10
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Zhijie Wang, Yanyan Wang, Baohua Li, James C. Bouwer, Kenneth Davey, Jun Lu and Zaiping Guo
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Abstract
In traditional non-flammable electrolytes a trade-off always exists between non-flammability and battery performance. Previous research focused on reducing free solvents and forming anion-derived solid-electrolyte interphase. However, the contribution of solvated anions in boosting the stability of electrolyte has been overlooked. Here, we resolve this via introducing anions into Li+ solvation sheaths using anions with similar Gutmann donor number (DN) to that of solvent. Taking trimethyl phosphate fire-retardant (DN = 23.0 kcal mol-1) and NO3- (DN = 22.2 kcal mol-1) as an example, NO3- is readily involved in the Li+ solvation sheath and reduces the polarity of solvent. This results in boosted stability of electrolyte against Li. The developed non-flammable electrolyte has low viscosity, high ionic conductivity and is low cost. The reversibility of Li-Cu cell was improved to 99.49% and the lifespan of practical LMBs was extended by > 100%.
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Version of record online: September 5, 2022
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© 2022 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purpo