文献类型：期刊文献

英文题名：TiO2-coated LiNi0.9Co0.08Al0.02O2 cathode materials with enhanced cycle performance for Li-ion batteries

作者：Li, Wei-Wei[1]; Zhang, Xiang-Jun[2]; Si, Jiang-Ju[1]; Yang, Jie[1]; Sun, Xue-Yi[2]

第一作者：李伟伟

通讯作者：Li, Wei-Wei|[1107139071061]李伟伟;

机构：[1] College of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang, 453003, China; [2] R&D Centre for Vehicle Battery and Energy Storage, General Research Institute for Nonferrous Metals, Beijing, 100088, China

第一机构：新乡学院化学化工学院

通讯机构：[1]College of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang, 453003, China|[110713]新乡学院化学化工学院;[11071]新乡学院;

年份：2021

卷号：40

期号：7

起止页码：1719-1726

外文期刊名：Rare Metals

收录：EI(收录号：20202808907339);Scopus(收录号：2-s2.0-85087383542)

语种：英文

外文关键词：Cobalt compounds - Lithium-ion batteries - Nickel compounds - Aluminum compounds - Electric discharges - Electrolytes - Ions - Coatings - Scanning electron microscopy - Cathodes - High resolution transmission electron microscopy - Lithium compounds

摘要：Abstract: Ni-rich cathode material is one of the most promising materials for Li-ion batteries in electric vehicles. However, fading capacity, poor cyclic stability and high pH value are still major challenges, which suppress its practical application. In this study, spherical LiNi0.9Co0.08Al0.02O2 powders with 0.4 wt% TiO2 coating layer were prepared by impregnation–hydrolysis method. Scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) results show that TiO2 is uniformly coated on the surface of LiNi0.9Co0.08Al0.02O2 particle and slightly embedded into LiNi0.9Co0.08Al0.02O2 particles. After 100 cycles at 2.0C, 0.4 wt% TiO2-coated LiNi0.9Co0.08Al0.02O2 electrode delivers much higher discharge capacity retention (77.0%) than the pristine LiNi0.9Co0.08Al0.02O2 electrode (63.3%). The excellent cycling performance of 0.4 wt% TiO2-coated LiNi0.9Co0.08Al0.02O2 electrode at a high discharge ratio is due to a TiO2 coating layer which can effectively reduce the direct contact between cathode material and electrolyte, suppress the oxidation of electrolyte, improve electrical conductivity of the electrode and increase the stability of the structure. Graphic abstract: With the increase of current density, TCNC sample clearly exhibits enhanced cycling performance with higher capacity retention, and the capacity retention of TCNC increases by 22% at 2.0 C.[Figure not available: see fulltext.] ? 2020, The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature.