文献类型：期刊文献

英文题名：Armoring SiOx with 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, ZQ[1];Lee, CS[1];Tong, ZQ[2]

机构：[1]City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Dept Chem, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China;[2]Guizhou Inst Technol, Coll Mat & Met Engn, Guiyang 550003, Guizhou, Peoples R China;[3]City Univ Hong Kong, Dept Mech Engn, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China

第一机构：City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Dept Chem, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China

通信机构：corresponding author), City Univ Hong Kong, Ctr Super Diamond & Adv Films COSDAF, Dept Chem, Kowloon, Tat Chee Ave, Hong Kong, Peoples R China;corresponding author), Guizhou Inst Technol, Coll Mat & Met Engn, Guiyang 550003, Guizhou, Peoples R China.|贵州理工学院材料与冶金工程学院;贵州理工学院;

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：;WOS:【SCI-EXPANDED(收录号:WOS:000635284900044)】；

基金：The authors are grateful for the financial support from City University of Hong Kong (CityU Internal Funds for External Grant Schemes Project No. 9678157) and the Science and Technology Foundation of Guizhou Province of China (No. qian ke he ji chu [2017] 1065).

语种：英文

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

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 SiOx electrode from 301 to 1034 mA h g(-1) after 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 LiPF6 molecules 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.