材料科学
阴极
氟化物
化学工程
X射线光电子能谱
氧化物
氧化还原
无机化学
物理化学
冶金
化学
工程类
作者
Ji Qian,Yang Ha,Krishna Prasad Koirala,Di Huang,Zhi Huang,Vincent Battaglia,Chongmin Wang,Wanli Yang,Wei Tong
标识
DOI:10.1002/adfm.202205972
摘要
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, Li 1.2 Mn 0.6 Ti 0.2 O 1.8 F 0.2 , 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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