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Issue 3, 2012
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One-pot synthesis of carbon-coated VO2(B) nanobelts for high-rate lithium storage

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Abstract

Uniform carbon-coated single crystalline vanadium dioxide (VO2(B)@C) nanobelts were successfully prepared by using a facile one-pot hydrothermal approach. Sucrose plays a dual role in this hydrothermal process, namely as a carbon precursor for the carbon shell and, as a reductant to reduce V2O5 to VO2(B). The thickness of the carbon coating layer is tunable from 3.0 to 6.9 nm by changing the ratio of the precursors. Although a high carbon content can improve the electrical conductivity of VO2(B)@C nanobelts, a thick carbon coating layer would block the lithium ion diffusion. The optimal thickness is found to be 4.3 nm (carbon content: 6.6 wt%), where the cathode displays superior performance with highly reversible specific capacities, good cycling stabilities and excellent rate capabilities (e.g. 100 mA h gāˆ’1 at 12.4 C).

Graphical abstract: One-pot synthesis of carbon-coated VO2(B) nanobelts for high-rate lithium storage

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Supplementary files

Article information


Submitted
08 Sep 2011
Accepted
21 Oct 2011
First published
12 Dec 2011

RSC Adv., 2012,2, 1174-1180
Article type
Paper

One-pot synthesis of carbon-coated VO2(B) nanobelts for high-rate lithium storage

X. Rui, D. Sim, C. Xu, W. Liu, H. Tan, K. Wong, H. H. Hng, T. M. Lim and Q. Yan, RSC Adv., 2012, 2, 1174
DOI: 10.1039/C1RA00698C

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