Structural and electrochemical properties of Al~(3+)doped V_2O_5 nanoparticles prepared by an oxalic acid assisted soft-chemical method

摘要

V_2O_5 and Al_(0.2)V_2O_5nanoparticles were prepared by an oxalic acid assisted soft-chemical method. X-ray photoelectron spectroscopy confirmed the V~(5+)oxidation state of V_2O_5,whereas an intermediate state between V~(5+) and V~(4+)of Al_(0.2)V_2O_5.Raman scattering showed that the AL~(3+) ions existed in an [AlO_6] octahe-dral environment. The doping of Al~(3+) increased the cohesion between the V_2O_5slabs, which enhanced the structural stability of the material. The chemical diffusion coefficients of the Al_(0.2)V_2O_5nanoparticles were a little bit smaller than those of V_2 O_5.Charge-discharge cycling showed that the Al_(0.2)V_2 O_5nanoparticles exhibited much better capacity retention than the un-doped V_2O_5, which was attributed to the enhanced structural stability of the material.