文献类型：期刊文献

英文题名：Armoring SiOxwith a conformal LiF layer to boost lithium storage

作者：Kang, Tianxing Tan, Jihua Li, Xiaocui Liang, Jianli Wang, Hui Shen, Dong Wu, Yan Huang, Zhongming Lu, Yang Tong, Zhongqiu Lee, Chun-Sing

第一作者：Kang, Tianxing

通信作者：Tong, Zhongqiu

机构：[1] Department of Chemistry, Center, of Super-Diamond and Advanced Films [COSDAF], City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; [2] College of Materials and Metallurgical Engineering, Guizhou Institute of Technology, Guiyang, Guizhou, 550003, China; [3] Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong

第一机构：Department of Chemistry, Center, of Super-Diamond and Advanced Films [COSDAF], City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong

年份：2021

卷号：9

期号：12

起止页码：7807-7816

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20211410175034);Scopus(收录号：2-s2.0-85103438427)

语种：英文

外文关键词：Coatings - Lithium - Silicon - Cathodes - Seebeck effect - Solid electrolytes - Lithium-ion batteries - Nickel compounds - Anodes - Cobalt compounds - Density functional theory - Silicon compounds - Manganese compounds

摘要：The LiF-rich solid electrolyte interphase (SEI) is an emerging research hotspot to improve battery performance. Its high Li-ion conductivity and high interfacial energy result in fast lithiation/de-lithiation in electrode materials while at the same time protect materials from pulverization. Currently, the developed LiF-rich SEI fabrication methods are based on electrolyte decomposition upon cycling, but so far have only been applied to Li metal or Si anodes. Furthermore, the influences of LiF on the electrochemical behavior of the electrolyte are not fully understood. Here, a new pre-coating approach is proposed to fabricate a conformal LiF layer on both anode and cathode materials (silicon suboxide (SiOx) and LiNi0.8Co0.1Mn0.1O2(NCM811) as examples). LiF assisted the increase in the specific capacity of a SiOxelectrode from 301 to 1034 mA h g?1after 100 cycles at 500 mA g?1. In addition, a full cell assembled with a prepared anode (SiOG@LiF3) and cathode (NCM811@LiF3) showed outstanding cycling stability. Combining density functional theory (DFT) calculation with SEM and XPS characterization revealed for the first time that the pre-coating LiF layer had a strong preferential adsorption of LiPF6molecules on the surface, leading to the formation of inorganic-rich SEI during cycling; thereby enabling a fast Li-ion uptake/removal process and improving the electrode integrity. ? The Royal Society of Chemistry 2021.