Synthesis of hierarchical ZnV2O4 microspheres and its electrochemical properties
Hierarchical ZnV2O4 microspheres were synthesized using an ethanol thermal reduction route for the first time, in which vanadium with a low valence can be formed. ZnV2O4 microspheres were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), transmission electron microscopy (SEM/TEM) and N2 adsorption–desorption measurements. Furthermore, this material was used as an anode for Li ion intercalation and exhibited high reversible capacity, high rate performance, and good cycling stability. For instance, a high reversible capacity of 638 mA h g−1 was maintained after 280 cycles at a current density of 100 mA g−1. These results might be attributed to the facts that hierarchical ZnV2O4 microspheres could buffer the strain and volume changes during the charge–discharge cycling process, and provide more sites for Li ion storage and a shorter path for Li ion diffusion, leading to improved capacity and high rate performance.