文献类型：期刊文献

英文题名：Enhancing Surface and Crystal Stability of the Ni-High NCA Cathode for High-Energy and Durable Lithium-Ion Batteries

作者：Wu, Jiabao[1,2];Zhu, Huawei[1,2];Yu, Haifeng[1,2];Wang, Zhihong[1,2];Jiang, Hao[1,2];Li, Chunzhong[1,2]

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

年份：2022

卷号：61

期号：7

起止页码：2817

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20220911704761);WOS:【SCI-EXPANDED(收录号:WOS:000766191300015)】；

基金：This work was supported by the National Natural Science Foundation of China (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：Lithium-ion batteries - Silicon - Electrolytes - Niobium - Coatings - Doping (additives) - Silicon compounds - Microcracks - Ions - Nickel compounds - Cathodes

摘要：The promising LiNi0.92Co0.05Al0.03O2 (NCA) cathode materials have become attractive recently for high-energy-density lithium-ion batteries (LIBs), but they suffer from severe capacity fade due to structure degradation and interface instability. Herein, a dual-modification strategy of Nb doping and Li4SiO4 coating is employed to consolidate the surface and crystal stability of NCA. The Nb doping could suppress the anisotropic volume change and alleviate the generation of microcracks. Also, the Li4SiO4 coating layer effectively accelerates the Li-ion transfer and protects the NCA surface from electrolyte attack. These advantages make the dual-modified NCA exhibit a high specific capacity of 199.2 mA h g(-1) at 1 C with a capacity retention of 93.3% after 100 cycles. It delivers a high capacity of 160.0 mA h g(-1) at 10 C, much higher than the pristine NCA (138.2 mA h g(-1)). The structure-performance relationship has been discussed. This work may provide guidance to modify Ni-high cathode materials for enhancing the high-energy and cyclic performance of LIBs.