Surficial structure regulation of SiOx material by high-energy ball milling and wet-alkali chemical reaction for lithium-ion batteries

• Published in: Journal of power sources 2023-11, Vol.584, Article 233608
• Main Authors: Mu, Xue, Fu, Chuankai, Mu, Tiansheng, Li, Renlong, Gao, Yunzhi, Du, Chunyu, Yin, Geping, Zuo, Pengjian
• Format: Article
• Language: English
• Subjects: Electrochemical performance; High-energy ball-milling; Lithium-ion batteries; Ordering of amorphous silicon; SiOx anode; Surface O/Si ratio
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2023.233608

The inhomogeneous nature of SiOx anode material on the atomic scale directly affects its electrochemical performance. A large irreversible capacity loss at the first cycle severely hinders the applications of SiOx materials in lithium ion batteries. The modification of SiOx by means of high-energy ball-milling and wet alkali chemical reaction can tune the ordering of amorphous silicon and silicon dioxide in SiOx materials, which is beneficial to the activation of nano silicon region and the surficial composition optimization of the lithiated products of SiOx during the first discharge process, and the formed Li2SiO3 phase and the increased O/Si ratio in the surface of SiOx contribute to the improved cyclic performance. This surface regulation approach is quite simple, efficient and suitable for large-scale applications of high-performance SiOx anode material. [Display omitted] •The SiOx was modified via high-energy ball milling and wet-alkali chemical reaction.•The Li + ions as network modifier contributes the surface structural recombination of SiOx.•The changes in SiOx surface chemistry optimize the lithiated products of SiOx.•The increased O/Si ratio of SiOx improves the cycling performance.