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- Title
Synthesis and electrochemical performance of TiO-sulfur composite cathode materials for lithium-sulfur batteries.
- Authors
Li, Qiang; Zhang, Zhian; Zhang, Kai; Xu, Lei; Fang, Jing; Lai, Yanqing; Li, Jie
- Abstract
Titania-sulfur (TiO-S) composite cathode materials were synthesized for lithium-sulfur batteries. The composites were characterized and examined by X-ray diffraction, nitrogen adsorption/desorption measurements, scanning electron microscopy, and electrochemical methods, such as cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge tests. It is found that the mesoporous TiO and sulfur particles are uniformly distributed in the composite after a melt-diffusion process. When evaluating the electrochemical properties of as-prepared TiO-S composite as cathode materials in lithium-sulfur batteries, it exhibits much improved cyclical stability and high rate performance. The results showed that an initial discharge specific capacity of 1,460 mAh/g at 0.2 C and capacity retention ratio of 46.6 % over 100 cycles of composite cathode, which are higher than that of pristine sulfur. The improvements of electrochemical performances were due to the good dispersion of sulfur in the pores of TiO particles and the excellent adsorbing effect on polysulfides of TiO.
- Subjects
ELECTROCHEMISTRY; PERFORMANCE evaluation; TITANIUM oxides; COMPOSITE materials synthesis; LITHIUM sulfur batteries; X-ray diffraction; CYCLIC voltammetry
- Publication
Journal of Solid State Electrochemistry, 2013, Vol 17, Issue 11, p2959
- ISSN
1432-8488
- Publication type
Article
- DOI
10.1007/s10008-013-2203-3