2025-08-13 北京大学(PKU)
Fig. 1: Resulting simulated delithiated structures under AIMD.
＜関連情報＞
- https://newsen.pku.edu.cn/news_events/news/research/15054.html
- https://www.nature.com/articles/s41563-025-02293-9
低電圧下における四面体配位とO–O形式酸化還元を有する非晶質Li–V–O–F正極材料 An amorphous Li–V–O–F cathode with tetrahedral coordination and O–O formal redox at low voltage
Kun Zhang,Tonghuan Yang,Tao Chen,Yali Yang,Zewen Jiang,Chuan Gao,Yuxuan Zuo,Wukun Xiao & Dingguo Xia
Nature Materials Published:22 July 2025
DOI:https://doi.org/10.1038/s41563-025-02293-9
Abstract
The ever-increasing demand for lithium-ion batteries has necessitated the development of high-performance cathode materials. However, previous studies have predominantly focused on crystal cathodes comprising the octahedral coordination of metal atoms and a well-ordered layered topology. This omits other cathode materials with other structures or coordination that could potentially surpass conventional counterparts in terms of performance. Here, using X-ray diffraction, resonant inelastic X-ray scattering and X-ray absorption near-edge spectra experiments, we investigated an amorphous Li–V–O–F cathode (a-LVOF) with tetrahedral coordination and elucidated an O–O formal redox mechanism at a moderate voltage of 4.1 V, without a conventional octahedral Li–O–Li configuration. The electrochemically amorphized material fosters randomly distributed VO4 units and scattered dangling oxygen bonds, which facilitated O–O binding. Moreover, a-LVOF demonstrates a high capacity of 230 mAh g−1. Our findings reveal a low-voltage O–O formal redox mechanism in an amorphized cathode material.
