Chinese Journal of Applied Chemistry

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Preparation and Lithium Ion Storage Performance of Sulfur-Doped Titanium Dioxide/Titanium Carbide Composite

Jimei HUANG,Ruijin MENG,Jinhu YANG()   

  1. School of Chemical Science and Engineering,Tongji University,Shanghai 200092,China
  • Received:2018-04-24 Published:2018-07-24
  • Contact: Jinhu YANG
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21273161), Natural Science Foundation of Shanghai(No.17ZR1447800)

Abstract:

Sulfur-doped titanium dioxide/titanium carbide(S-TiO2/Ti3C2)composites were prepared via in-situ hydrothermal oxidation and chemical vapor phase sulfurization using two-dimensional layered Ti3C2 as the raw material. The results show that the TiO2 nanoparticles in situ grew on the Ti3C2 nanosheets and sulphur was successfully doped into titanium dioxide. The S-TiO2/Ti3C2 composite as anode material for lithium ion batteries exhibits superior electrochemical performance. A discharge specific capacity of 288 mA·h/g can be obtained after 100 cycles at a current density of 0.2 A/g, which is much higher than those of TiO2/Ti3C2 and pure Ti3C2 electrodes. The outstanding cycle stability and discharge specific capacity of the S-TiO2/Ti3C2 electrode are attributed to following reasons:TiO2 nanoparticles electrically contacting Ti3C2 nanosheets can facilitate the interfacial electron transfer and effectively avoid the separation of the two components during the cycle. In addition, S-TiO2 can improve the conductivity of the TiO2 and produce some defects to enhance the reactivity. This work provides a new strategy for the preparation of two-dimensional composite materials through an in-situ transformation.

Key words: sulfur doping, titanium dioxide, two-dimensional transition metal carbides, composite, lithium-ion batteries