Stabilized cobalt-free lithium-rich cathode materials with an artificial lithium fluoride coating

作     者：Wei Liu Jinxing Li Hanying Xu Jie Li Xinping Qiu Wei Liu;Jinxing Li;Hanying Xu;Jie Li;Xinping Qiu

作者机构：Key Laboratory of Organic Optoelectronics and Molecular EngineeringDepartment of ChemistryTsinghua UniversityBeijing 100084China School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2022年第29卷第5期

页      面：917-924页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 

基　　金：financially supported by the project of International Science&Technology Cooperation of China(No.2019YFE0100200) 

主　　题：cobalt-free lithium-rich cathode materials lithium fluoride coating cycle stability dissolution 

摘      要：Iron-substituted cobalt-free lithium-rich manganese-based materials,with advantages of high specific capacity,high safety,and low cost,have been considered as the potential cathodes for lithium ion ***,challenges,such as poor cycle stability and fast voltage fade during cycling under high potential,hinder these materials from ***,we developed a method to directly coat LiF on the particle surface of Li_(1.2)Ni_(0.15)Fe_(0.1)Mn_(0.55O2).A uniform and flat film was successfully formed with a thickness about 3 nm,which can effect-ively protect the cathode material from irreversible phase transition during the deintercalation of Li^(+).After surface coating with 0.5wt%LiF,the cycling stability of Li_(1.2)Ni_(0.15)Fe_(0.1)Mn_(0.55O2) cycled at high potential was significantly improved and the voltage fade was largely suppressed.