Enhanced Electrochemical Performances of Cobalt-Doped Li₂MoO₃ Cathode Materials

Zhiyong Yu; Jishen Hao; Wenji Li; Hanxing Liu

doi:10.3390/ma12060843

Enhanced Electrochemical Performances of Cobalt-Doped Li₂MoO₃ Cathode Materials

Materials (Basel). 2019 Mar 13;12(6):843. doi: 10.3390/ma12060843.

Authors

Zhiyong Yu^{1

2}, Jishen Hao^{3

4}, Wenji Li^{5

6}, Hanxing Liu^{7

8}

Affiliations

¹ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China. yuzhiyong@whut.edu.cn.
² School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China. yuzhiyong@whut.edu.cn.
³ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China. haojishen@live.com.
⁴ School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China. haojishen@live.com.
⁵ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China. lwjwhut@126.com.
⁶ School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China. lwjwhut@126.com.
⁷ State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China. lhxhp@whut.edu.cn.
⁸ International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China. lhxhp@whut.edu.cn.

Abstract

Co-doped Li₂MoO₃ was successfully synthesized via a solid phase method. The impacts of Co-doping on Li₂MoO₃ have been analyzed by X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) measurements. The results show that an appropriate amount of Co ions can be introduced into the Li₂MoO₃ lattices, and they can reduce the particle sizes of the cathode materials. Electrochemical tests reveal that Co-doping can significantly improve the electrochemical performances of the Li₂MoO₃ materials. Li₂Mo_0.90Co_0.10O₃ presents a first-discharge capacity of 220 mAh·g^-1, with a capacity retention of 63.6% after 50 cycles at 5 mA·g^-1, which is much better than the pristine samples (181 mAh·g^-1, 47.5%). The enhanced electrochemical performances could be due to the enhancement of the structural stability, and the reduction in impedance, due to the Co-doping.

Keywords: Co-doping; Li ion battery; Li2MoO3; cathode materials.

Abstract

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