Vanadium Oxide 3-D Nanostructures for Lithium Ion Battery Cathodes
Here we present electrodes produced by controllably interlinking an array of uniform nanotubes. The aspect ratio of the nanotubes and the number of interconnecting points can be modified systematically. 3-D branched anodized aluminum oxide (AAO) membranes are used as templates for the atomic layer deposition of vanadium oxide (V2O5). AAO templates have frequently been used to produce uniform high aspect ratio arrays of materials, and the systematic introduction of branch points allows our templates to be expanded into three dimensional networks. The use of an ALD deposition process allows these templates to be uniformly and conformally coated with V2O5, creating nanostructured cathodes whose morphology can be carefully and systematically controlled.
We successfully produced a series of V2O5 cathodes with varying aspect ratios as well as the number and spacing of branch points. These cathodes were then characterized by a variety of electrochemical methods, including cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge. These studies will lay the groundwork for rationally designed 3-D electrodes and full battery devices in the future.