文献类型：期刊文献

中文题名：TiO_(2)-coated LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)cathode materials with enhanced cycle performance for Li-ion batteries

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

第一作者：Wei-Wei Li

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

年份：2021

卷号：40

期号：7

起止页码：1719-1726

中文期刊名：稀有金属：英文版

外文期刊名：Rare Metals

收录：CSCD:【CSCD2021_2022】；

基金：the National Natural Science Foundation of China(No.51701173)。

语种：英文

中文关键词：Li-ion batteries;Cathode materials;TiO_(2);LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2);Enhanced cycle performance

摘要：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 p H value are still major challenges,which suppress its practical application.In this study,spherical LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)powders with 0.4 wt%TiO_(2)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 TiO_(2)is uniformly coated on the surface of LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)particle and slightly embedded into LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)particles.After 100 cycles at 2.0 C,0.4 wt%TiO_(2)-coated LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)electrode delivers much higher discharge capacity retention(77.0%)than the pristine LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)electrode(63.3%).The excellent cycling performance of 0.4 wt%Ti O_(2)-coated LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2)electrode at a high discharge ratio is due to a TiO_(2)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.