文献类型：期刊文献

英文题名：Compositional Gradient Engineering of LiNi0.75Co0.05Mn0.20O2 Greatly Enhances High-Voltage Cycling Stability for Li-Ion Batteries

作者：Ren, Zhihua[1];Guo, Wenshuai[1];Zhao, Peiying[1];Yu, Haifeng[2];Chen, Ling[1];Jiang, Hao[1,2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Hierarch Nanomat, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2026

卷号：65

期号：9

起止页码：5002

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20261120249585);WOS:【SCI-EXPANDED(收录号:WOS:001701887700001)】；

基金：This work was supported by the National Natural Science Foundation of China (U22A20429), the Shanghai Pilot Program for Basic Research (22TQ1400100-13), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Cathodes - Charging (batteries) - Coatings - Cobalt compounds - High temperature engineering - Lithium compounds - Lithium-ion batteries - Manganese compounds - Nickel oxide - Semiconductor doping - Stability

摘要：Ni-rich Co-poor layered oxide cathodes enable high energy density under high-voltage operation (upper cutoff of >= 4.5 V) but suffer from severe structural and interfacial degradation under high-voltage operation. Herein, we propose a synergistic strategy that integrates trace W doping with an island-type Li x CoO2 surface coating to construct a full-concentration-gradient LiNi0.75Co0.05Mn0.20O2 cathode. The W dopant effectively suppresses transition-metal interdiffusion during high-temperature lithiation to preserve a sharp gradient with a Ni-rich core and Mn-rich surface, enhancing the structural stability and relieving the mechanical stress. Simultaneously, the conductive Li x CoO2 coating scavenges residual lithium, accelerates interfacial charge transfer, and enhances Li+ diffusion. Consequently, the optimized cathode delivers a high reversible capacity of 220 mAh & centerdot;g-1 at 0.1C and remarkable rate capability (100.0 mAh & centerdot;g-1 at 10C). In pouch-type full cells cycled up to 4.6 V, it retains 92.6% capacity after 1000 cycles, significantly outperforming its unmodified counterpart (75.9%). This work demonstrates a synergistic structural-interfacial engineering to achieve both high-power and long-life Ni-rich Co-poor cathodes toward high-energy Li-ion batteries.