Toward Stable Cycling of a Cost-Effective Cation-Disordered Rocksalt Cathode via Fluorination |
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| Authors: | Ji Qian Yang Ha Krishna Prasad Koirala Di Huang Zhi Huang Vincent S Battaglia Chongmin Wang Wanli Yang Wei Tong |
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| Affiliation: | 1. Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA;2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA;3. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354 USA;4. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99354 USA |
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| Abstract: | The recently developed Li-excess cation-disordered rock salts (DRXs) exhibit an excellent chemical diversity for the development of alternative Co/Ni-free high-energy cathodes. Herein, the synthesis of a highly fluorinated DRX cathode, Li1.2Mn0.6Ti0.2O1.8F0.2, based on cost-effective and earth-abundant transition metals, via a solid-state reaction, is reported. The fluorinated DRX cathode using ammonium fluoride precursor exhibits more uniform particle size and delivers a specific discharge capacity of 233 mAh g?1 and specific energy of 754 Wh kg?1, with 206 mAh g?1 retained after 200 cycles. The combined synchrotron X-ray absorption spectroscopy and resonant inelastic X-ray scattering spectroscopy analysis reveals that the remarkable cycling performance is attributed to the high fluorination and thus enhanced Mn content, enabling the utilization of more Mn redox than the oxide analog. This study demonstrates a great promise to develop next-generation cost-effective DRX cathodes with enhanced capacity retention for high-energy Li-ion batteries. |
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| Keywords: | disordered rock salts electrochemical kinetics fluorination Li-ion battery cathodes particle size engineering |
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