In-situ formation of Li_(0.5)Mn_(0.5)O coating layer through defect controlling for high performance Li-rich manganese-based cathode material

作     者：Aipeng Zhu Qin Wang Yin Zhang Yueyin Zhang Xiaogang He Kaipeng Wu Hao Wu Qian Wang Wenlong Cai Yun Zhang Aipeng Zhu;Qin Wang;Yin Zhang;Yueyin Zhang;Xiaogang He;Kaipeng Wu;Hao Wu;Qian Wang;Wenlong Cai;Yun Zhang

作者机构：Department of Advanced Energy MaterialsCollege of Materials Science and EngineeringSichuan UniversityChengdu 610064SichuanChina Engineering Research Center of Alternative Energy Materials&DevicesMinistry of EducationSichuan UniversityChengdu 610064SichuanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第8期

页      面：384-391,I0010页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：financial support from the National Natural Science Foundation of China(51904193) the Major Science and Technology Projects of Sichuan Province(2019ZDZX0029) the Fundamental Research Funds for the Central Universities 

主　　题：Defect Interfacial stability Li_(0.5)Mn_(0.5)O Li-rich layered oxides Lithium-ion batteries 

摘      要：Li-rich layered oxide of Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)with a considerable specific capacity and higher voltage is regarded as a kind of promising cathode ***,it suffers from transition metal ion dissolution and oxygen escape that leads to rapid capacity *** addition,the poor lithium-ion diffusion kinetics gives rise to unsatisfied rate ***,a stable layer of Li_(0.5)Mn_(0.5)O(LMO)out of LMNO is in-situ constructed through acetic passivation and following calcination *** generated defect structure in the composite material exhibits fast ion diffusion kinetics and the produced LMO layer can stabilize the substructure,resulting in elevated cycling stability and rate *** specific,the LMNO@LMO material exhibits a high initial coulombic efficiency of 80.3%and remarkable capacity retention of 80.7%after 200 cycles at 1 ***,the composite material reveals prominent rate performance that delivers discharge capacities of 158 and 131 m Ah g^(-1) at 5 and 10 C,*** last,this study presents a new approach to optimizing the Li-rich cathode materials.