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Nano Research

, Volume 9, Issue 1, pp 198–206 | Cite as

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

  • Xue Liu
  • Kai Zhang
  • Kaixiang Lei
  • Fujun Li
  • Zhanliang Tao
  • Jun Chen
Research Article

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 → Na x CoS2) occurs; while at the second plateau around 0.6 V, the conversion reaction (Na x CoS2 + (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 disulfide micro/nano-structures sodium storage mechanism cycling stability 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Xue Liu
    • 1
  • Kai Zhang
    • 1
  • Kaixiang Lei
    • 1
  • Fujun Li
    • 1
  • Zhanliang Tao
    • 1
  • Jun Chen
    • 1
    • 2
  1. 1.Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education)Nankai UniversityTianjinChina
  2. 2.Collaborative Innovation Center of Chemical Science and EngineeringNankai UniversityTianjinChina

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