文献类型：期刊文献

英文题名：In situ surface engineering enables high interface stability and rapid reaction kinetics for Ni-rich cathodes

作者：Guo, Wenshuai[1];Wei, Wu[1];Zhu, Huawei[1];Hu, Yanjie[1];Jiang, Hao[1,2];Li, Chunzhong[1,2]

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

年份：2023

卷号：3

期号：1

外文期刊名：ESCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001078542400001)】；

基金：Acknowledgments This work was supported by the National Natural Science Foundation of China (21975074, 91834301) , the Innovation Program of Shanghai Municipal Education Commission, and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Ni-rich cathode; Surface engineering; High energy density; Interface stability; Li -ion batteries

摘要：Layered oxide cathodes with high Ni content promise high energy density and competitive cost for Li-ion batteries (LIBs). However, Ni-rich cathodes suffer from irreversible interface reconstruction and undesirable cracking with severe performance degradation upon long-term operation, especially at elevated temperatures. Herein, we demonstrate in situ surface engineering of Ni-rich cathodes to construct a dual ion/electron-conductive NiTiO3 coating layer and Ti gradient doping (NC90-Ti@NTO) in parallel. The dual-modification synergy helps to build a thin, robust cathode-electrolyte interface with rapid Li-ion transport and enhanced reaction kinetics, and effec-tively prevents unfavorable crystalline phase transformation during long-term cycling under harsh environments. The optimized NC90-Ti@NTO delivers a high reversible capacity of 221.0 mAh g-1 at 0.1C and 158.9 mAh g-1 at 10C. Impressively, it exhibits a capacity retention of 88.4% at 25 degrees C after 500 cycles and 90.7% at 55 degrees C after 300 cycles in a pouch-type full battery. This finding provides viable clues for stabilizing the lattice and interfacial chemistry of Ni-rich cathodes to achieve durable LIBs with high energy density.