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.

引用

页数：7

共 25 条

[11] Synthesis and characterization of Mo-doped LiNi0.5Co0.2Mn0.3O2 cathode materials prepared by a hydrothermal process [J].