Carbon nanocage supported synthesis of V2O5 nanorods and V2O5/TiO2 nanocomposites for Li-ion batteries

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Date
2013-09
Authors
Armstrong, Mark J.
Burke, David M.
Gabriel, Timothy
O'Regan, Colm
O'Dwyer, Colm
Petkov, Nikolay
Holmes, Justin D.
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The Royal Society of Chemistry
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Abstract
We present the facile synthesis of crystalline V2O5 nanorods and V2O5/TiO2 nanocomposites structures by a carbon nanocage (CNC)-assisted growth process, using vanadium triisopropoxide oxide and titanium isopropoxide precursors in air at 500 [degree]C. The diameters of the resultant V2O5 nanorods ranged between [similar]10 and 70 nm, while the crystalline V2O5/TiO2 nanocomposite structures adopted a unique morphology, due to both crystallisation and templating processes, with V2O5 adopting small-diameter nanowire and nanorod morphologies surrounded by sub-30 nm TiO2 nanoparticles. The V2O5 nanorods and V2O5/TiO2 nanocomposites were characterised by electron microscopy and X-ray diffraction techniques and subsequently reviewed as positive Li-ion electrodes. The phase-pure V2O5 nanorod structures exhibited appreciable Li+ storage properties over the potential range of 2.0-4.0 V vs. Li/Li+, displaying capacities of up to 288 mA h g-1 with appreciable cyclic behaviour at test rates of up to [similar]1 C. The crystalline V2O5/TiO2 nanocomposite structures displayed similar Li+ storage properties, however, increasing molar fractions of TiO2 led to a decline in the overall capacity versus the single-phase V2O5 counterparts. Interestingly, the Li+ insertion behaviour of the V2O5/TiO2 nanocomposite displayed character more-typical of amorphous V2O5, which was ascribed to a structural buffering effect of the inactive TiO2 phase.
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Keywords
V2O5/TiO2 nanocomposite synthesis , V2O5 nanorods synthesis , Carbon nanocage (CNC)-assisted growth process , Li-ion batteries
Citation
ARMSTRONG, M. J., BURKE, D. M., GABRIEL, T., O'REGAN, C., O'DWYER, C., PETKOV, N. & HOLMES, J. D. 2013. Carbon nanocage supported synthesis of V2O5 nanorods and V2O5/TiO2 nanocomposites for Li-ion batteries. Journal of Materials Chemistry A, 1, 12568-12578. doi: 10.1039/c3ta12652h
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