Dual-site Doping to Enhance Oxygen Redox and Structural Stability of Li-rich Layered Oxides

作     者：Zuhao Zhang Xiaoyan Xie Huixian Xie Xiaokai Ding Jiaxiang Cui Chenyu Liu Dong Luo Zhan Lin Zuhao Zhang;Xiaoyan Xie;Huixian Xie;Xiaokai Ding;Jiaxiang Cui;Chenyu Liu;Dong Luo;Zhan Lin

作者机构：Guangzhou Key Laboratory of Clean Transportation Energy ChemistrySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou 510006China 

出 版 物：《Chinese Journal of Structural Chemistry》 (结构化学（英文）)

年 卷 期：2022年第41卷第4期

页      面：61-67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 National Natural Science Foundation of China(52004070 and 51874104) the National Key R&D Program of China(2011YFB0700600) 

主　　题：lithium-ion battery Li-rich layered oxides doping Li_(2)MnO_(3) 

摘      要：Cobalt-free Li-rich layered oxides(LLOs)such as Li_(2)MnO_(3) have attracted extensive attention owing to their high specific capacity and low ***,numerous problems such as continuous voltage fading and capacity decay have become stumbling blocks in its commercial *** this study,we propose an effective dual-site doping strategy by choosing Mo as the cation and F as the anion to enhance the capacity and cycling *** researchdemonstrates that the cycling stability of LLOs enhances with the doping ratio of Mo,and their capacity increases with the doping ratio of *** is because Mo as a pillar enhances the structural stability and F doping is conducive to the activation of Li;MnO;.What’s more,dual-site doping also promotes the diffusion of Li;and reduces the internal resistance of the *** to these improvements,the 5F3M sample still maintains a discharge capacity of 190.98 mAh g;after 100 cycles at 200 mA g^(-1),which is much higher than 165.29 mAh g;of the Pristine *** discovery provides a new way to develop advanced layered oxide cathodes for both Na-and Li-ion batteries.