锆
材料科学
电化学
介电谱
结构精修
锂(药物)
X射线光电子能谱
分析化学(期刊)
掺杂剂
兴奋剂
阴极
化学工程
晶体结构
电极
化学
冶金
光电子学
物理化学
结晶学
工程类
内分泌学
医学
色谱法
作者
Ding Wang,Xinhai Li,Zhixing Wang,Huajun Guo,Yan Xu,Yulei Fan,Juanjian Ru
标识
DOI:10.1016/j.electacta.2015.11.093
摘要
The severe capacity fading and poor rate performance under high voltage of LiNi0.5Co0.2Mn0.3O2 are the vital barriers for their large scale application. In order to solve above issues, zirconium doped LiNi0.5Co0.2Mn0.3O2 materials were prepared by solid state method. The effects of the zirconium content on the structure and electrochemical properties of Li(Ni0.5Co0.2Mn0.3)1-xZrxO2 were extensively studied. Though the zirconium doped samples delivered lower initial capacities, the cycling stability are dramatically enhanced. Notably, Li(Ni0.5Co0.2Mn0.3)0.99Zr0.01O2 showed a capacity retention of 83.78% at 1C after 100 repeated cycle in a high voltage of 4.6 V, while that of bare sample remains only 69.35%. Moreover, the rate capability of Li(Ni0.5Co0.2Mn0.3)0.99Zr0.01O2 is also greatly reinforced especially at high current density. The improved electrochemical performances could be ascribed to the less cation mixing degree, better lithium transportation kinetic and lower impedance, which were confirmed by Rietveld refinement, X-ray photoelectron spectroscopy and electron impedance spectroscopy.
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