Improving the electrochemical performance of ternary material LiNi0.5Co0.2Mn0.3O2 by Mg2+doping

被引：5
作者：
Feng, Dandan [1 ,2 ]
Qin, Xiaozhuan [1 ,2 ]
Wang, Lan [1 ,2 ]
Zheng, Liping [1 ,2 ]
Li, Yuanyuan [1 ,2 ]
Gao, Tianzeng [3 ]
Tang, Zhongfeng [4 ]
机构：
[1] Zhengzhou Inst Technol, Coll Chem Engn & Food Sci, Zhengzhou 450044, Peoples R China
[2] Zhengzhou Inst Technol, Postdoctoral Innovat Practice Base, Zhengzhou 450044, Peoples R China
[3] Henan Ground Biol Sci & Technol Co Ltd, Zhengzhou 450001, Peoples R China
[4] Henan Univ Engn, Coll Mat Engn, Zhengzhou 451191, Peoples R China
来源：
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE | 2023年 / 18卷 / 09期
关键词：
Lithium-ion batteries; Ternary cathode material; Mg2+doping; Rate capabilities; LINI0.6CO0.2MN0.2O2; CATHODE; SUBSTITUTION; DEGRADATION;
D O I：
10.1016/j.ijoes.2023.100283
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
A carbonate co-precipitation method is used to synthesize the precursor Ni0.5-xMgxCo0.2Mn0.3CO3, and then lithium source is added to synthesize LiNi0.5-xMgxCo0.2Mn0.3O2 cathode materials doped with different proportions of Mg2+ (x = 0, 0.02, 0.05, 0.1) after high temperature calcination. The material was characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray powder diffractometer (XRD), and the electrochemical properties of the material were analyzed by batteries test and electrochemical impedance spectroscopy (EIS). The results show that an appropriate amount of Mg2+ doping can stabilize the layered structure and reduce the mixing of Li+/Ni2+, which is conducive to the rapid deintercalation of lithium ions. Compared with the bare material, the samples with Mg2+ doping amount of 0.02 have significant improvements in the first coulombic efficiency (91.9 %), cycle performance (86.2 % after 100 cycles). Especially, the rate performance of Mg2+-0.02 doping sample shows an excellent capability of 130 mA h/g at 5 C, while the bare sample only has 90 mA h/g.
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页数：7
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