阴极
材料科学
兴奋剂
电化学
锂(药物)
钽
氧化物
化学工程
纳米技术
冶金
光电子学
电极
化学
物理化学
内分泌学
工程类
医学
作者
Xiang Li,Wujie Ge,Keke Zhang,Gongchang Peng,Yuan-Xiang Fu,Xianguo Ma
标识
DOI:10.1016/j.electacta.2021.139653
摘要
Due to their high specific capacity, nickel (Ni)-rich layered oxide cathode materials are considered to be promising for use as cathode materials in lithium (Li)-ion batteries. However, such materials exhibit poor cycling performance, which hinders their commercial applications. Herein, Ta bulk doping in Ni-rich layered oxide cathode materials is comprehensively analysed using experimental results and density functional theory calculations. It is observed that Ta5+ uniformly distributes in the bulk of the cathode materials. Further studies reveal that Ta prefers to enter both Li and TM sites, and when the doping amount increases Ta doped at TM site dominates. After Ta doping, the energy of the (001) facets is lowered, which thus affects the primary particle morphology, resulting in a preferential growth mode that produce elongated and radially oriented primary particles. A Ni-rich cathode material doped with 1 wt% of Ta shows the best cycling and rate performance, which indicates that a certain level of Ta doping is beneficial towards improving the structural stability and electrochemical performance of Ni-rich cathode materials.
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