Journal
RSC ADVANCES
Volume 2, Issue 3, Pages 1174-1180Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ra00698c
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Funding
- AcRF Tier 1 of MOE [RG 31/08]
- Singapore Ministry of Education [MOE2010-T2-1-017]
- A*STAR SERC [1021700144, MPA 23/04.15.03 RDP 009/10/102, MPA 23/04.15.03 RDP 020/10/113]
- [NRF2009EWT-CERP001-026]
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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 g(-1) at 12.4 C).
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