Synthesis and Electrochemical Properties of LiCo_1-xMg_xMnO₄ and LiCo_1-xAl_xMnO₄ (x= 0, 0.02, 0.05, 0.1) as Positive Materials for Lithium-ion Batteries

Authors

Mei-ling YOU, Department of Chemistry, Fujian Normal University, Fuzhou 35007, China;
Qing-song TONG, Department of Chemistry, Fujian Normal University, Fuzhou 35007, China;
Xiu-hua LI, Department of Chemistry, Fujian Normal University, Fuzhou 35007, China;
Min LIN, State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;
Xing-kang HUANG, Department of Chemistry, Fujian Normal University, Fuzhou 35007, China;Follow
Yong YANG, State Key Laboratory for Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China;Follow

Corresponding Author

Xing-kang HUANG(xkhuang@126.com);
Yong YANG(yyang@xmu.edu.cn)

Abstract

The Al-doped and Mg-doped LiCoMnO₄ materials were synthesized through solid-state reaction. The effects of doping amounts of Mg and Al on the initial capacities, discharge plateaus, and cycle performances were investigated. The morphologies and structures of the as-prepared materials were studied by scanning electron microscopy and powder X-ray diffraction. The results indicate that the as-prepared samples were composed of uniform, well-crystallized particles. The pristine LiCoMnO₄ possessed an initial capacity of 87.0 mAh·g^-1, while LiCo_0.98Mg_0.02MnO₄ and LiCo_0.98Al_0.02MnO₄ delivered 91.3 and 93.6 mAh·g^-1, respectively. The proper doping amount increased the capacity and the ratio of discharge plateau at 5 V, while over-doping decreased the discharge capacity of LiCoMnO₄. In addition, Al doping significantly improved the cycle performance of LiCoMnO₄, while no apparent influence with Mg doping.

Graphical Abstract

Keywords

solid state reaction, spinel LiCoMnO4, Mg-doped, Al-doped, lithium-ion battery, cathode material

DOI Link

https://doi.org/10.13208/j.electrochem.121122

Publication Date

2014-02-25

Online Available Date

2014-02-24

Revised Date

2013-01-10

Received Date

2012-11-22

Recommended Citation

Mei-ling YOU, Qing-song TONG, Xiu-hua LI, Min LIN, Xing-kang HUANG, Yong YANG. Synthesis and Electrochemical Properties of LiCo_1-xMg_xMnO₄ and LiCo_1-xAl_xMnO₄ (x= 0, 0.02, 0.05, 0.1) as Positive Materials for Lithium-ion Batteries[J]. Journal of Electrochemistry, 2014 , 20(1): 22-27.
DOI: 10.13208/j.electrochem.121122
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/5