A Facile Li_(2)TiO_(3) Surface Modification to Improve the Structure Stability and Electrochemical Performance of Full Concentration Gradient Li-Rich Oxides

作     者：Naifang Hu Yuan Yang Lin Li Yuhan Zhang Zhiwei Hu Lan Zhang Jun Ma Guanglei Cui Naifang Hu;Yuan Yang;Lin Li;Yuhan Zhang;Zhiwei Hu;Lan Zhang;Jun Ma;Guanglei Cui

作者机构：Qingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Institute of Materials Science and EngineeringOcean University of ChinaQingdao 266100China School of Future TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China Max Planck Institute for Chemical Physics of SolidsNothnitzer Strasse 40Dresden D-01187Germany CAS Key Laboratory of Green Process and EngineeringBeijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Shandong Energy InstituteQingdao 266101China 

出 版 物：《Energy & Environmental Materials》 (能源与环境材料（英文）)

年 卷 期：2024年第7卷第3期

页      面：41-48页

核心收录：

学科分类：0808[工学-电气工程] 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] 

基　　金：financially supported by the Natural Science Foundation of Shandong Province(ZR2022QB166,ZR2020KE032) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA22010600) the Youth Innovation Promotion Association of CAS(2021210) the Foundation of Qingdao Postdoctoral Application Program(Y63302190F) the Natural Science Foundation of Qingdao Institute ofBioenergy and Bioprocess Technology(QIBEBT SZ202101) support from the Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials 

主　　题：full concentration gradient lithium-rich layered oxides structure stability surface modification 

摘      要：Full concentration gradient lithium-rich layered oxides are catching lots of interest as the next generation cathode for lithium-ion batteries due to their high discharge voltage,reduced voltage decay and enhanced rate performance,whereas the high lithium residues on its surface impairs the structure stability and long-term cycle ***,a facile multifunctional surface modification method is implemented to eliminate surface lithium residues of full concentration gradient lithium-rich layered oxides by a wet chemistry reaction with tetrabutyl titanate and the post-annealing *** realizes not only a stable Li_(2)TiO_(3)coating layer with 3D diffusion channels for fast Li^(+)ions transfer,but also dopes partial Ti^(4+)ions into the sub-surface region of full concentration gradient lithium-rich layered oxides to further strengthen its crystal ***,the modified full concentration gradient lithium-rich layered oxides exhibit improved structure stability,elevated thermal stability with decomposition temperature from 289.57℃to 321.72℃,and enhanced cycle performance(205.1 mAh g^(-1)after 150 cycles)with slowed voltage drop(1.67 mV per cycle).This work proposes a facile and integrated modification method to enhance the comprehensive performance of full concentration gradient lithium-rich layered oxides,which can facilitate its practical application for developing higher energy density lithium-ion batteries.