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Journal of Materials Science

, Volume 50, Issue 12, pp 4250–4257 | Cite as

PVP-assisted synthesis of shape-controlled CuFeS2 nanocrystals for Li-ion batteries

  • Xinkai Wu
  • Yanru Zhao
  • Chongqing Yang
  • Gufeng HeEmail author
Original Paper

Abstract

In this paper, chalcopyrite CuFeS2 with sheet-like or rod-like morphology has been synthesized by solvothermal reaction route in the presence of poly(vinylpyrrolidone) (PVP). The concentration of PVP has significant influences on the morphology of CuFeS2 nanocrystals. With the increasing concentrations of PVP, the sheet morphology of CuFeS2 becomes more uniform. Meanwhile, the average dimensions of CuFeS2 sheets are reduced and small CuFeS2 nanoparticles are clearly decreased. When the molar ratio of CuFeS2 to PVP is 1:2, the shape of CuFeS2 changes to rod-like, which is composed of CuFeS2 sheets. Considering the influence of uniformity and shape of CuFeS2 nanocrystals, the CuFeS2 nanocrystals with different molar ratios of PVP have been used as active component to prepare anode for Li-ion batteries. The Li-ion battery using CuFeS2 nanocrystals with the molar ratio of 1:2 to PVP shows the highest reversible specific capacity of ~519 mAh/g after 50 cycles at a current density of 100 mA/g and maintains a specific capacity of ~400 mAh/g at a density of 1000 mA/g. The results demonstrate that the PVP-assisted CuFeS2 electrodes are promising candidates for use as Li-ion batteries.

Keywords

Specific Capacity Electrochemical Impedance Spectroscopy Reversible Capacity CuFeS2 Potential Plateau 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The present work was supported by 973 Program (2013CB328803, 2013CB328804), the National Natural Science Foundation of China (61377030), and the Science and Technology Commission of Shanghai Municipal (12JC1404900).

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Xinkai Wu
    • 1
  • Yanru Zhao
    • 2
  • Chongqing Yang
    • 2
  • Gufeng He
    • 1
    Email author
  1. 1.National Engineering Lab for TFT-LCD Materials and Technologies, and Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghaiPeople’s Republic of China
  2. 2.School of Chemistry and Chemical EngineeringShanghai Jiao Tong UniversityShanghaiPeople’s Republic of China

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