文献类型：期刊文献

英文题名：Surface enrichment and diffusion enabling gradient-doping and coating of Ni-rich cathode toward Li-ion batteries

作者：Yu, Haifeng[1];Cao, Yueqiang[2];Chen, Long[1];Hu, Yanjie[1];Duan, Xuezhi[2];Dai, Sheng[3];Li, Chunzhong[1];Jiang, Hao[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Key Lab Ultrafine Mat,Minist Educ, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat & Feringa Nobel Prize Scientist J, Shanghai, Peoples R China

年份：2021

卷号：12

期号：1

外文期刊名：NATURE COMMUNICATIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000683367300027)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003, 91834301 and 51621002), the Innovation Program of Shanghai Municipal Education Commission, the National Program for Support of Top-Notch Young Professionals, and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

摘要：Critical barriers to layered Ni-rich cathode commercialisation include their rapid capacity fading and thermal runaway from crystal disintegration and their interfacial instability. Structure combines surface modification is the ultimate choice to overcome these. Here, a synchronous gradient Al-doped and LiAlO2-coated LiNi0.9Co0.1O2 cathode is designed and prepared by using an oxalate-assisted deposition and subsequent thermally driven diffusion method. Theoretical calculations, in situ X-ray diffraction results and finite-element simulation verify that Al3+ moves to the tetrahedral interstices prior to Ni2+ that eliminates the Li/Ni disorder and internal structure stress. The Li+-conductive LiAlO2 skin prevents electrolyte penetration of the boundaries and reduces side reactions. These help the Ni-rich cathode maintain a 97.4% cycle performance after 100 cycles, and a rapid charging ability of 127.7mAhg(-1) at 20C. A 3.5-Ah pouch cell with the cathode and graphite anode showed more than a 500-long cycle life with only a 5.6% capacity loss. The commercialisation of promising Ni-rich cathodes is limited by capacity fading and thermal runaway. Here, the authors design a gradient Al-doped and LiAlO2-coated LiNi0.9Co0.1O2 cathode, which addresses the crystal degradation and interfacial instability and thus improves the cycle and thermal stabilities.