Abstract
Extending the lifespan of lithium (Li) batteries involves managing reactions at the Li anode and stabilizing the solid–electrolyte interphase (SEI) through strategic regulation of the electrolyte composition. Here we synthesized a fluorinated cyclic ether with minimized Li-ion coordination capability and enhanced electrochemical stability. We demonstrated its crucial role in manipulating the SEI formation process by differentiating the contribution of dual anions to the SEI layer. Consequently, a bilayer SEI is formed, featuring a Li2O-rich inner layer and a LiF-rich outer layer, enabling improved stability and reversibility of Li-metal anodes. The developed electrolyte shows remarkable improvement in calendar life and cycling stability of Li (50 µm)||NMC811 (4 mAh cm−2) cells, maintaining 80% capacity after 568 and 218 cycles at room temperature and 60 °C, respectively. Furthermore, our 410 Wh kg−1 prototype pouch cells demonstrate 80% capacity retention for 470 cycles.
Original language | English (US) |
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Pages (from-to) | 817-827 |
Number of pages | 11 |
Journal | Nature Energy |
Volume | 9 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2024 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology