Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (6): 1197-1204.doi: 10.3866/PKU.WHXB201703293

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Electrochemical Behavior of MWCNT-Constraint SnS2 Nanostructure as the Anode for Lithium-Ion Batteries

Ze-Yu GU1,Song GAO1,Hao HUANG1,*(),Xiao-Zhe JIN1,Ai-Min WU1,Guo-Zhong CAO1,2   

  1. 1 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams(Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China
    2 Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA
  • Received:2017-01-04 Published:2017-05-19
  • Contact: Hao HUANG E-mail:huanghao@dlut.edu.cn
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(51171033);Science and Technology Supported Plan (Industry Field) of Changzhou, China(CE20160022);Project of Innovative Talents Introduction and Training of Changzhou, China(CQ20153002);Fundamental Research Funds for the Central Universities, China(DUT16LAB03);Fundamental Research Funds for the Central Universities, China(DUT15LAB05)

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Abstract:

Multi-walled carbon nanotube constrained SnS2 (SnS2@MWCNT) nanostructure is successfully realized through a facile 2-step process. Firstly, DC arc-discharge method is applied to fabricate Sn@MWCNT nanoparticles as the precursor that is subsequently converted into SnS2@MWCNT through low-temperature vulcanization. Various analytical methods, including powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy, are used to ascertain the microstructure and morphology of the SnS2@MWCNT nanoparticles. The results show that the SnS2@MWCNT nanoparticles have a uniform structure of SnS2 half-filled MWCNTs with average thickness of 10 nm and average length of ~400 nm. The electrochemical properties of the as-prepared SnS2@MWCNT nanoparticles are studied using the nanoparticles as anode materials in Li-ion batteries. The SnS2@MWCNT electrode presents high initial Coulombic efficiency of 71% and maintains a capacity of 703 mAh·g-1 after 50 cycles. Excellent performance of the batteries benefits from the active electrochemical reactions of various chemical components, multi-step lithiation/delithiation behaviors, and the structural constraint from the MWCNTs.

Key words: Lithium-ion battery, Multi-walled carbon Nanotube, Tin disulfide, Anode, Nanomaterial