Journal
RSC ADVANCES
Volume 5, Issue 94, Pages 77348-77353Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra13823j
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Funding
- National Natural Science Foundation of China [51302219, 51472204, 51402236]
- Natural Science Foundation of Shaanxi Province [2015JM2045]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20136102120024]
- Fundamental Research Funds for the Central Universities [3102014JCQ01019]
- Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China [06-QP-2014]
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Sulfur is an attractive cathode material with a high specific capacity of 1675 mA h g(-1), but its rapid capacity decay due to polysulfide dissociation presents a significant technical challenge. Here, we present the fabrication of a TiO2/S composite cathode by encapsulating elemental sulfur into TiO2 nanotube hosts for high performance lithium-sulfur batteries. A high capacity of 913 mA h g(-1) has been achieved at a rate of 0.2C in the initial cycle for the TiO2/S composite cathode with a sulfur content of 65 wt% and the reversible capacity remains as high as 851 mA h g(-1) after 100 cycles. The improvements of electrochemical performances were attributed to the good dispersion of sulfur in the TiO2 nanotubes and the excellent adsorbing effect on polysulfides of TiO2.
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