期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 3, 页码 1343-1349出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201404686
关键词
cathodes; electrochemistry; hollow carbon nanofibers; hybrid nanostructures; lithium-sulfur batteries; titanium dioxide
资金
- Teacher Research Fund of Central South University [2013JSJJ027]
- Fundamental Research Funds for the Central Universities of Central South University [2014zzts179]
- Engineering Research Center of Advanced Battery Materials from the Ministry of Education, China
A hollow carbon nanofiber hybrid nanostructure anchored with titanium dioxide (HCNF@TiO2) was prepared as a matrix for effective trapping of sulfur and polysulfides as a cathode material for Li-S batteries. The synthesized composites were characterized and examined by X-ray diffraction, nitrogen adsorption-desorption measurements, field-emission scanning electron microscopy, scanning transmission electron microscopy, and electrochemical methods such as galvanostatic charge/discharge, rate performance, and electrochemical impedance spectroscopy tests. The obtained HCNF@TiO2-S composite showed a clear core-shell structure with TiO2 nanoparticles coating the surface of the HCNF and sulfur homogeneously distributed in the coating layer. The HCNF@TiO2-S composite exhibited much better electrochemical performance than the HCNF-S composite, which delivered an initial discharge capacity of 1040mAhg(-1) and maintained 650mAhg(-1) after 200cycles at a 0.5C rate. The improvements of electrochemical performances might be attributed to the unique hybrid nanostructure of HCNF@TiO2 and good dispersion of sulfur in the HCNF@TiO2-S composite.
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