VANADIUM OXIDE NANOTUBES -ELECTROCHEMISTRY AND STRUCTURE

摘要

Vanadium oxide nanotubes have been studied in a Li-ion battery context where it has proved to be a well functioning cathode material. The tubes consist of scroll-like layers of vanadium oxide separated by templating molecules (e.g. primary amines) that can be readily exchanged by various metal cations without destroying the tubular structure. Their performance as active cathode material was tested by cyclic voltammetry and galvanostatic cycling for both as-synthesised (tubes with embedded amine molecules) and Na-exchanged material. The Na-substituted material showed a maximum capacity of >200 mAh/g (cycled in the potential range 1.8-3.5 V), which is well in line with other vanadium oxide electrode materials. The structure and morphology of the tubes were investigated by XRD and TEM.