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Synergistic electrolyte additives for enhancing the performance of high-voltage lithium-ion cathodes in half-cells and full-cells
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Kazzazi, Arefeh, Bresser, Dominic, Kuenzel, Matthias, Hekmatfar, Maral, Schnaidt, Johannes, Jusys, Zenonas, Diemant, Thomas, Behm, R.Jürgen, Copley, Mark, Maranski, Krzystof, Cookson, James, de Meatza, Iratxe, Axmann, Peter, Wohlfahrt-Mehrens, Margret and Passerini, Stefano (2020) Synergistic electrolyte additives for enhancing the performance of high-voltage lithium-ion cathodes in half-cells and full-cells. Journal of Power Sources, 482 . 228975. doi:10.1016/j.jpowsour.2020.228975 ISSN 0378-7753.
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Official URL: http://dx.doi.org/10.1016/j.jpowsour.2020.228975
Abstract
Herein we address the key challenge towards the practical use of high-voltage lithium-ion cathode materials, i.e., the insufficient stability of the electrolyte towards oxidation. The transition metals in such materials, especially nickel, catalyze the decomposition reaction of the electrolyte, ultimately leading to poor cycling stability and rapid fading of the battery. To tackle this challenge, a new combination of electrolyte additives is introduced, targeting stabilized electrode/electrolyte interfaces and interphases for both the anode and cathode. The results show that the synergistic effect of tris(trimethylsilyl) phosphite (TTSPi) and bis(2,2,2-trifluoroethyl) carbonate (TFEC) can significantly improve the performance of cathode half-cells and also of lithium-ion full-cells with a cell voltage higher than 4.5 V. Cells using both TTSPi and TFEC as additives show greatly enhanced cycling stability, increased capacity, and improved coulombic efficiency, which can be even further improved when adding also lithium bis(oxalato)borate.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
| Journal or Publication Title: | Journal of Power Sources | ||||||||
| Publisher: | Elsevier S.A. | ||||||||
| ISSN: | 0378-7753 | ||||||||
| Official Date: | 15 January 2020 | ||||||||
| Dates: |
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| Volume: | 482 | ||||||||
| Article Number: | 228975 | ||||||||
| DOI: | 10.1016/j.jpowsour.2020.228975 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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