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Research Article

Facile synthesis and electrochemical sodium storage of CoS2 micro/nano-structures

Xue Liu1, Kai Zhang1, Kaixiang Lei1, Fujun Li1, Zhanliang Tao1, Jun Chen1,2( )
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)Nankai UniversityTianjin300071China
Collaborative Innovation Center of Chemical Science and EngineeringNankai UniversityTianjin300071China
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Abstract

We report the synthesis and electrochemical sodium storage of cobalt disulfide (CoS2) with various micro/nano-structures. CoS2 with microscale sizes are either assembled by nanoparticles (P-CoS2) via a facile solvothermal route or nanooctahedrons constructed solid (O-CoS2) and hollow microstructures (H-CoS2) fabricated by hydrothermal methods. Among three morphologies, H-CoS2 exhibits the largest discharge capacities and best rate performance as anode of sodium-ion batteries (SIBs). Furthermore, H-CoS2 delivers a capacity of 690 mA·h·g-1 at 1 A·g-1 after 100 cycles in a potential range of 0.1–3.0 V, and ~240 mA·h·g-1 over 800 cycles in the potential window of 1.0–3.0 V. This cycling difference mainly lies in the two discharge plateaus observed in 0.1–3.0 V and one discharge plateau in 1.0–3.0 V. To interpret the reactions, X-ray diffraction (XRD) and transmission electron microscopy (TEM) are applied. The results show that at the first plateau around 1.4 V, the insertion reaction (CoS2 + xNa+ + xe- → NaxCoS2) occurs; while at the second plateau around 0.6 V, the conversion reaction (NaxCoS2 + (4 - x) Na+ + (4 - x)e- → Co + 2Na2S) takes place. This provides insights for electrochemical sodium storage of CoS2 as the anode of SIBs.

Keywords

cobalt disulfidemicro/nano-structuressodium storage mechanismcycling stability

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Nano Research
Volume 9 Issue 1,
January 2016
Pages 198-206
DOI: 10.1007/s12274-016-0981-5
Cite this article:
Liu X, Zhang K, Lei K, et al. Facile synthesis and electrochemical sodium storage of CoS2 micro/nano-structures. Nano Research, 2016, 9(1): 198-206. https://doi.org/10.1007/s12274-016-0981-5
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Received: 11 October 2015
Revised: 13 December 2015
Accepted: 16 December 2015
Published: 14 January 2016
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016
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