Electrochemical studies of V2O5-CNTs nanocomposite

Carbon nanotubes (CNTs) doped vanadium pentoxide (V₂O₅) porous aerogels are a good kind of material as the cathode material in lithium batteries due to their layered structure, high energy density, good reversibility, high capacity for lithium ion insertion. V₂O₅-CNTs nanocomposites were synthesized by a sol-gel method, using the solvent exchange and ambient pressure drying technique. Electrochemical measurements of the nanocomposite were tested. The lithium ion capacity and cycle ability of the composites were investigated by galvanostatic discharge-charge cycling. The results showed that the nanocomposite had the higher capacity, about 384.0 mAh/g in the first discharge process and 256.3 mAh/g in the second discharge cycle. The charge-transfer reaction at the electrode/electrolyte interface and the kinetic mechanism were too studied by using electrochemical impedance spectroscopy.