Abstract
VO2(B) nanobelts have been successfully synthesized via a simple hydrothermal route. The products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Raman spectrum. These nanobelts are of rectangular cross-section with mean length about 1 μm, mean width about 80 nm, and mean thickness about 50 nm. The as-synthesized VO2nanobelts were assembled as the cathode electrodes of lithium ion batteries. Their electrochemical properties were studied by conventional charge/discharge tests, which show an initial discharge capacity of 321 mAh g−1with voltage plateau near 2.5 V. These results indicated that such hydrothermally synthesized VO2(B) nanobelts could be an ideal candidate of cathode material for lithium ion battery.
Highlights
IntroductionsDuring the past few years, vanadium-oxides-based materials have attracted much attention due to their fascinating structures and electronic, optical, and magnetic properties, which are relevant to such diverse areas as lubrication, chemical sensor, catalysis, cathode materials in batteries, and minerals [1,2,3,4,5,6,7]
All the chemicals were of analytical grade and purchased from Shanghai Chemical Reagents
The morphology and structure of the resulting products were characterized by field-emission scanning electron microscopy (FE-SEM S-4800, Hitachi), X-ray powder diffraction (Rigaku RINT2400 with Cu Kα radiation), and micro-Raman spectrometer (Jobin Yvon LabRAM HR800 UV, YGA 532 nm)
Summary
During the past few years, vanadium-oxides-based materials have attracted much attention due to their fascinating structures and electronic, optical, and magnetic properties, which are relevant to such diverse areas as lubrication, chemical sensor, catalysis, cathode materials in batteries, and minerals [1,2,3,4,5,6,7]. VO2 (B) is very difficult to synthesize by conventional high temperature procedures because the phase change from metastable VO2 (B) to thermodynamically more stable rutile VO2 will occur at T > 300◦C and the latter shows no attractive electrochemical properties [10]. We are interested in developing simple methods to synthesize VO2 (B) nanostructures using nontoxic reducing agent and exploring its morphology-related electrochemical properties. We report a simple hydrothermal approach to synthesize VO2 (B) nanobelts with rectangular cross-section using nontoxic glucose as reducing agent, and its electrochemical properties are studied by conventional charge/discharge tests
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