Abstract: Vanadium oxide nanotubes (VO_x-NTs) were synthesized in a rheological phase reaction followed by self-assembling process and characterized by XRD, SEM, TEM, Raman, ESR, TG-DTA, XPS, and simulated battery. The results show that the black products consist majority of VO_x-NTs with length of 1—10 μm and diameter of 30—100 nm, whose walls consist of 3—10 VO_x layers with interlayer distance of 3.53 nm. Raman spectrum indicates the stretching or bending vibration of V—O, lattice vibration of layered structure and organic group vibration of template. ESR spectrum with no superfine structure confirms the presence of V⁴⁺ and the average valence of vanadium in the product is +4.30 on the basis of TG and XPS. The initial charge and discharge capacity of VO_x-NTs are 404 and 383 mA·h/g, respectively. The discharge capacity decreases to 180 mA·h/g after 50 cyclee, which can be attributed to the VO_x-NTs reacting with the electrolyte and isolating from the carbon particles during the charge-discharge.

Key words: Vanadium oxide nanotubes, Electrochemical properly, Rheological phase-self-assembly