We have shown [12] that nano-sized Mn3O4 formed from elec- trospun polymeric fibers showed promising anodic behavior, com- parable to the pioneering work on the CoO anode [13]. Here, we report the extension of that work to the formation of nano-sized vanadium pentoxide, which has one of the highest theoretical capacities, 510 Ah/kg, of any transition metal oxide by a two-elec- tron redox process. We used the electrospinning method to form the precursor that is hydrothermally treated to form nano-sized crystals of the double sheet d-phase of vanadium oxide. This in