Carbon-coated cobalt oxide porous spheres with improved kinetics and good structural stability for long-life lithium-ion batteries

Xuekun Tang; Qiming Feng; Jing Huang; Kun Liu; Xianping Luo; Qian Peng

doi:10.1016/j.jcis.2017.09.086

Carbon-coated cobalt oxide porous spheres with improved kinetics and good structural stability for long-life lithium-ion batteries

J Colloid Interface Sci. 2018 Jan 15:510:368-375. doi: 10.1016/j.jcis.2017.09.086. Epub 2017 Sep 22.

Authors

Xuekun Tang¹, Qiming Feng², Jing Huang¹, Kun Liu³, Xianping Luo⁴, Qian Peng¹

Affiliations

¹ School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Hunan Key Laboratory of Mineral Materials and Application, Central South University, Changsha 410083, China.
² School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China.
³ School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; Hunan Key Laboratory of Mineral Materials and Application, Central South University, Changsha 410083, China. Electronic address: kliu@csu.edu.cn.
⁴ Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China.

PMID: 28963939
DOI: 10.1016/j.jcis.2017.09.086

Abstract

Current anode materials for lithium-ion batteries (LIBs) mainly suffer from poor electronic conductivity and large volume expansion upon cycling. Improving kinetics and designing good morphology structural stability of electrode materials can effectively enhance the lithium storage performances of LIBs. In this study, we successfully synthesized hierarchical carbon-coated cobalt oxide (C@CoO) porous spheres with improved kinetics and good structural stability, which were investigated by ex situ electrochemical impedance spectrometry, scanning electron microscopy, and powder X-ray diffraction. We also optimized the preparation conditions of the C@CoO porous spheres. The C@CoO350 porous spheres exhibited good electrochemical performances including the high 2nd specific capacity of 811mAhg^-1 at 0.1Ag^-1 and good rate property of 450mAhg^-1 at 4Ag^-1. Furthermore, it demonstrated an excellent cyclic stability with a high capacities of 669mAhg^-1 after 400 cycles at 0.5Ag^-1. Results demonstrated that C@CoO350 porous spheres are promising LIBs anodes.

Keywords: Carbon coating; Cobalt oxide; Improved kinetics; Lithium ion battery; Structural stability.