Wang, Z;
Li, Z;
Fu, J;
Zheng, S;
Yu, R;
Zhou, X;
He, G;
(2023)
All-fluorinated electrolyte for non-flammable batteries with ultra-high specific capacity at 4.7 V.
Green Energy & Environment
10.1016/j.gee.2023.06.002.
(In press).
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Abstract
Li metal batteries (LMBs) with LiNi0.8Mn0.1Co0.1O2 (NMC811) cathodes could release a specific energy of >500 Wh kg−1 by increasing the charge voltage. However, high-nickel cathodes working at high voltages accelerate degradations in bulk and at interfaces, thus significantly degrading the cycling lifespan and decreasing the specific capacity. Here, we rationally design an all-fluorinated electrolyte with addictive tri(2,2,2-trifluoroethyl) borate (TFEB), based on 3, 3, 3-fluoroethylmethylcarbonate (FEMC) and fluoroethylene carbonate (FEC), which enables stable cycling of high nickel cathode (LiNi0.8Co0.1Mn0.1O2, NMC811) under a cut-off voltage of 4.7 V in Li metal batteries. The electrolyte not only shows the fire-extinguishing properties, but also inhibits the transition metal dissolution, the gas production, side reactions on the cathode side. Therefore, the NMC811||Li cell demonstrates excellent performance by using limited Li and high-loading cathode, delivering a specific capacity >220 mA h g−1, an average Coulombic efficiency >99.6% and capacity retention >99.7% over 100 cycles.
| Type: | Article |
|---|---|
| Title: | All-fluorinated electrolyte for non-flammable batteries with ultra-high specific capacity at 4.7 V |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.gee.2023.06.002 |
| Publisher version: | https://doi.org/10.1016/j.gee.2023.06.002 |
| Language: | English |
| Additional information: | © 2023 Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). |
| Keywords: | Fluorinated electrolyte; Li metal batteries; Solid electrolyte interphase; Cathode electrolyte interphase; Coulombic efficiency |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10173314 |
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