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 Xiang-Jun Zhang Jiang-Ju Si Jie Yang Xue-Yi Sun 

机构地区：[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

出　　处：《Rare Metals》2021年第7期1719-1726,共8页稀有金属（英文版）

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

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.

关 键 词：Li-ion batteries Cathode materials TiO_(2) LiNi_(0.)9Co_(0.08)Al_(0.02)O_(2) Enhanced cycle performance 

分 类 号：TQ131.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]