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

https://doi.org/10.3866/PKU.WHXB201703293.