Influence of thermal-decomposition temperatures on structures and properties of V2O5 as cathode materials for lithium ion battery

Submicron spherical V2O5 particles with a uniform size and a lower crystallinity were successfully synthesized by a chemical precipitation-thermal decomposition technique using the commercial V2O5 powders as starting material. The crystal structure and grain morphology of samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electrochemical testing such as discharge charge cycling (CD) and cyclic voltatnmetry (CV) were employed in evaluating their electrochemical properties as cathode materials for lithium ion battery. Results reveal that the crystallinity and crystalline size of V2O5 particles increased when the thermal-decomposition temperature increased from 400 degrees C to 500 degrees C. and their adhesiveness was also synchronously increased. This indicate that the thermal-decomposition temperature palyed a significant influence on electrochemical properties of V2O5 cathodes. The V2O5 sample obtained at 400 degrees C delivered not only a high initial discharge capacity of 330 mA h g(-1) also the good cycle stability during 50 cycles due to its higher values of a in crystal structure and better dispersity in grain morphology. (C) 2015 The Authors. Published by Elsevier GmbH.