Engineering layered/spinel heterostructure via molybdenum doping towards highly stable Li-rich cathodes

作     者：Kun-Qi Geng Meng-Qian Yang Jun-Xia Meng Ling-Fei Zhou Yu-Qin Wang Sydorov Dmytro Qian Zhang Sheng-Wen Zhong Quan-Xin Ma 

作者机构：Key Laboratory of Power Battery and MaterialsFaculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou341000China School of Physics and ElectronicsGannan Normal UniversityGanzhou341000China 

出 版 物：《Tungsten》 (钨科技（英文）)

年 卷 期：2022年第4卷第4期

页      面：323-335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：This work was supported by the National Natural Science Foundation of China(Grant No.51964017,Grant No.51874151) the Jiangxi Provincial Natural Science Foundation(Grant No.20212BAB214004) the Jiangxi Provincial Education Office Natural Science Fund Project(Grant No.GJJ201413) the Jiangxi University of Science and Technology College Student Innovation and Entrepreneurship Training Program Support Project(Grant No.DC2019-042) 

主　　题：Li-rich layered oxide Mo doping Layered/spinel heterostructure High rate performance Cycling stability 

摘      要：Li-rich layered oxide(LLO),e.g.,Li_(1.12)[Mn_(0.56)Ni_(0.16)Co_(0.08)]O_(2)(LRMO),is considered as a promising cathode material due to its superior Li-storage ***,the poor cycling stability and large voltage decay,which are related to the phase transition,limit its industrialization ***,a Mo-doped LRMO(Li_(1.12)[Mn_(0.56)Ni_(0.16)Co_(0.08)]_(0.98)Mo_(0.02)O_(2),LRMO-Mo2.0%)was successfully synthesized via a simple combination of co-precipitation with high-temperature calcination for solving the mentioned *** with the pristine counterpart,the as-prepared LRMO-Mo2.0%shows more excellent electrochemical performance in terms of rate capability(reversible capacity of 118 mA·h·g^(−1) at 5 C),cyclic ability(94.3%capacity retention after 100 cycles at 0.2 C)and discharge midpoint voltage decay(0.11 V after 100 cycles).Systematic investigation of structural evolution and electrochemical kinetics elucidate that the synergic effect of robust oxygen framework and layered/spinel heterostructure is the key to its performance *** synergy helps to stabilize the layered structure by curbing the structural transformation and oxygen escaping during the electrochemical *** work paved the way for the simple and efficient preparation of highly stable LLO cathode materials.