Showing papers by "Yong Wang published in 2005"
TL;DR: In this article, uniform polycrystalline SnO2 nanotubes, in either array or free-standing form, can be fabricated by an infiltration technique using SNO2 nanoparticles as starting building units.
Abstract: In this work we demonstrated that uniform polycrystalline SnO2 nanotubes, in either array or free-standing form, can be fabricated by an infiltration technique using SnO2 nanoparticles as starting building units. With this method, the diameter, length, thickness, and texture of the nanotubes can be further controlled. The tubular SnO2 shows a significant improvement of electrochemical performance over the unorganized nanoparticles. The specific capacity of the Sn-based nanotube electrode was 525 mAh/g after 80 cycles. In principle, the tubular structure of active component can also be extended to other metal oxides and Li−metal alloy systems. In view of their unique features, the prepared SnO2 nanotubes may also find interesting applications in other fields such as gas sensing.
419 citations
TL;DR: The CVD method is a simple route to fabrication of desired carbon nanostructures, affording a carbon with graphitic pore walls and uniform pores that enhances the rate performance and cyclability in lithium-ion batteries.
Abstract: In this study, ordered macroporous carbon with a three-dimensional (3D) interconnected pore structure and a graphitic pore wall was prepared by chemical vapor deposition (CVD) of benzene using inverse silica opal as the template. Field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectrometry, nitrogen adsorption, and thermogravimetric analysis techniques were used to characterize the carbon samples. The electrochemical properties of the carbon materials as a carbon-based anode for lithium-ion batteries and as a Pt catalyst support for room-temperature methanol electrochemical oxidation were examined. It was observed that the CVD method is a simple route to fabrication of desired carbon nanostructures, affording a carbon with graphitic pore walls and uniform pores. The graphitic nature of the carbon enhances the rate performance and cyclability in lithium-ion batteries. The specific capacity was found to be further improved when SnO2 nanoparticles were ...
198 citations
TL;DR: In this paper, the nanocomposites are characterized by XRD, ICP, FE-SEM, SEM and TEM/SAED and used as the material for negative electrodes (anodes) in Li-ion batteries.
84 citations
TL;DR: In this paper, nearly monosized Sn nanoparticles were produced by an in situ prepared single-source molecular precursor approach and were subsequently dispersed in graphite (KS6) and the application of the resulting nanocomposites as an active anode material for Li-ion batteries was explored.
Abstract: Nearly monosized Sn nanoparticles were produced by an in situ prepared single-source molecular precursor approach. The experimental conditions in the NaBH 4 reduction of (phen)SnCl 4 (phen = 1, 10 phenanthroline) in water were carefully controlled to produce two different particle size ranges, 2-5 nm (mean: 3.5 nm, standard deviation: 0.8 nm) and 7-13 nm (mean: 10.0 nm, standard deviation: 1.7 nm). The Sn nanoparticles were subsequently dispersed in graphite (KS6) and the application of the resulting nanocomposites as an active anode material for Li-ion batteries was explored. The graphite-Sn nanocomposites showed significant improvement in the cyclability of Sn over previously reported results. The cyclability improvement is believed to be due to the smallness of the Sn particles and their uniform distribution in a soft matrix (graphite) which, in addition to being a capable Li + host, could also effectively buffer the specific volume changes in Sn-based Li storage compounds during charging (Li + insertion) and discharging (Li + extraction) reactions.