Synthesis Characterization And Properties Of Porous Vanadium Pentoxide Electrode Materials

Carbon-coated V₂O₅ nanocrystals were prepared by using micrometer-sized V₂O₅ as a precursor and porous carbon as a hard template through a capillary induction approach. The small particle size in combination with surface carbon coating leads the V₂O₅ nanocrystals to exhibit markedly enhanced lithium discharge and charge capacities, excellent rate capability and cycling stability. At a current density as high as 2 A/g, the material delivers a reversible capacity of 280 mAh/g after 50 cycles, approximately 94% of its initial capacity value. The unprecedented electrochemical performance makes the carbon-coated nanocrystalline V₂O₅ a very promising cathode material for lithium ion batteries. It is also feasible for our preparation technique to be scaled up for industrial application.A series of ordered mesoporous vanadium pentoxide were prepared by using different porous carbon and varying reaction time. The ordered mesoporous V₂O₅ with a particle size of 500-600 nm in length and 150 nm in diameter has been synthesized in large scale through a capillary induction approach by choosing mesoporous CMK-3 as template. The mesoporous V₂O₅ exhibits an excellent supercapacitor performance with specific capacitances of 159 F g-1 and 150.9 F g-1, at 0.2 A g-1and 0.5 A g-1, respecitively. It suggests that mesoporous V₂O₅ has a potential application in electrochemical energy storage devices owing to their novel interior geometry and high surface area.