Synthesis, Structure and Electrochemical Properties of Vox Nanosheets Prepared from V2O5 and Carbon Aerogels

The VOx nanosheets cathode materials for Li-ion battery have been synthesized from V2O5 powders and carbon aerogels via sol-gel and hydrothermal methods. The carbon aerogels were produced through supercritical fluid drying and post carbonization process. The component of VOx nanosheets was characterized to be V3O7 center dot H2O which consists of V2O5 and VO2 units by Raman and XRD measurement. The SEM results show that ultra-uniform nanosheets of V3O7 center dot H2O are prepared with a length of more than 20 mu m and a width of nearly 2 mu m. Cathodes properties of V3O7 center dot H2O nanosheets were further evaluated by cyclic voltammetry and galvanostatic charge-discharge cycling up to 100 cycles. The electrochemical tests reveal that these cathode nanomaterial possesses good charge/discharge cycling stability and excellent high-rate performance even at the high current density of 12.8 A.g(-1).