Abstract
Vanadium pentoxide (V2O5∙nH2O) nanoribbons are synthesized via a hydrothermal process. These ribbons are 20nm thick, 200nm to 1μm wide and several tens of micrometers long. Free-standing binder-free films are prepared by using these nanoribbons with multi-walled carbon nanotubes (MWCNTs) and used as the cathode for rechargeable sodium batteries. The large interlayer space between the V2O5 bilayers can enhance the kinetics of sodium ion intercalation/deintercalation. In addition, the intertwining network of the V2O5∙0.34H2O film provides efficient electron conduction pathways and shortens diffusion distances of sodium ion. The electrochemical tests prove that the free-standing V2O5∙0.34H2O film cathode delivers high reversible specific capacities (190 mAh/g) and good cycling stabilities (170 mAh/g after 150 cycles) in the voltage range between 1.5V and 3.5V.
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