Abstract
ABSTRACTWe have prepared Ni-V2O5·nH2O core-shell nanocable arrays for Li+ intercalation applications. Ni-V2O5·nH2O nanocables were prepared via formation of Ni nanorod arrays through the template based electrochemical deposition, followed by coating of V2O5·nH2O on Ni nanorods through electrophoretic deposition. Transmission electron microscopy (TEM) micrograph clearly shows the Ni core was covered completely by a V2O5·nH2O shell. Electrochemical analysis demonstrates that in a current density of 1.6 A/g, the Li+ intercalation capacity of Ni-V2O5·nH2O nanocable array is approximately 10 times higher than that of single-crystal V2O5 nanorod array and 20 times higher than that of sol-gel-derived V2O5 film. Both energy density and power density of such nanocable-array electrodes are higher than the V2O5 film electrode by at least one order of magnitude. Such significant improvement in electrochemical performance is due to the large surface area and short diffusion path offered by the nanostructured V2O5·nH2O.
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