%0 Journal Article
%A Ji Qian
%A Yang Ha
%A Krishna Prasad Koirala
%A Di Huang
%A Zhi Huang
%A Vincent S Battaglia
%A Chongmin Wang
%A Wanli Yang
%A Wei Tong
%B Advanced Functional Materials
%D 2023
%G eng
%N 22
%R 10.1002/adfm.202205972
%T Toward Stable Cycling of a Cost‐Effective Cation‐Disordered Rocksalt Cathode via Fluorination
%U https://onlinelibrary.wiley.com/toc/16163028/33/22
%V 33
%8 05/2023
%! Adv Funct Materials
%X <p><span>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</span><sub><span>1.2</span></sub><span>Mn</span><sub><span>0.6</span></sub><span>Ti</span><sub><span>0.2</span></sub><span>O</span><sub><span>1.8</span></sub><span>F</span><sub><span>0.2</span></sub><span>, 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&nbsp;mAh&nbsp;g</span><sup><span>−1</span></sup><span>&nbsp;and specific energy of 754&nbsp;Wh&nbsp;kg</span><sup><span>−1</span></sup><span>, with 206&nbsp;mAh&nbsp;g</span><sup><span>−1</span></sup><span>&nbsp;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.</span></p>