Abstract
Graphene-molybdenum dioxide composites in several ratios have been prepared through a facile synthesis method. Depending on the ratio, the as synthesized composites have either 2-dimensional graphene sheets with MoO2 particles anchored to them or a clustered agglomerate morphology. The composites have been characterised using Raman spectroscopy, X-ray diffraction, and electron diffraction to confirm the monoclinic MoO2 phase that is present. Lithium storage properties of the as-synthesised samples were tested in a coin-type half cell assembly to determine the relationship between the ratio and the electrochemical performance. The sample with highest amount of MoO2 (78 wt%) displayed the most promising lithium storage properties, with stable cycling performance at 0.2 A g(-1) that shows negligible capacity loss over 50 cycles, retaining a capacity of 640 mA h g(-1). The rate capabilities were also tested, and show a capacity of 380 mA h g(-1) at 2.0 A g(-1), which is comparable to the theoretical capacity of graphite and previously reported work on similar materials.
Original language | English |
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Pages (from-to) | 16072-16077 |
Number of pages | 6 |
Journal | Journal of Materials Chemistry |
Volume | 22 |
Issue number | 31 |
DOIs | |
Publication status | Published - 2012 |
Keywords
- carbon
- cyclic performance
- electrodes
- high capacity
- ion battery anodes
- li storage
- nanocomposites (materials)
- nanosheets
- nanotubes