Controllable construction of La_(2)Li_(0.5)Co_(0.5)O_(4)multifunctional“armor”to stabilize Li-rich layered oxide cathode for highperformance lithium-ion batteries  

作　　者：Xiaoyang Deng Mi Li Zizai Ma Xiaoguang Wang 

机构地区：[1]Institute of New Carbon Materials,College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization,Taiyuan 030024,China [3]College of Chemistry,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《Nano Research》2023年第7期10634-10643,共10页纳米研究（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.21878201 and 22008165);the Natural Science Foundation of Shanxi Province(No.20210302124211);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2021L042);the Foundation of Taiyuan University of Technology(No.2022QN022);the 7th Youth Talent Support Program of Shanxi Province.

摘　　要：Lithium-rich manganese-based cathodes(LR)are valuable cathode materials for the next generation of lithium-ion batteries(LIBs)with high-energy density.However,the fast voltage/capacity decay on cycling is the major obstacle for the practical application induced by the less-than-ideal anionic redox reactions and structure distortion.Herein,in order to tackle these challenges,a perovskite-like La_(2)Li_(0.5)Co_(0.5)O_(4)(LLCO)material is selected as protective surface to stabilize the Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(LR)substrate through wet chemical coating method.Versatile structure/phase characterizations and electrochemical tests exhibit that the LLCO can not only minish the oxygen evolution and enhance the structure stability,but also restrain the electrolyte corrosion and increase the mechanical strength of cathode materials.Moreover,the coated LLCO with high electronic/ionic conductivity dramatically accelerates the energy storage kinetic,thereby displaying the improved rate performance.Specifically,the optimized LR@LLCO sample(1LLCO)exhibits a high capacity of 250.6 mAh·g^(-1)after 100 cycles at 0.1 C and excellent capacity retention of 82.6%after 200 cycles at 2 C.This work provides a new idea for the modification of LR cathodes toward commercial high-performance LIBs.

关 键 词：lithium-rich manganese-based oxide lithium-ion batteries surface modification electrochemical performance 

分 类 号：TM912[电气工程—电力电子与电力传动]