Synthesis and electrochemical performance of V2O5/NaV6O15 nanocomposites as cathode materials for sodium-ion batteries
(Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling,
College of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China)
College of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China)
Abstract: V2O5/NaV6O15 nanocomposites were synthesized by a facile hydrothermal method using VO2(B) nanoarrays as the precursor. X-ray diffraction, scanning electron microscopy and transmission electron microscopy, and galvanostatic charge-discharge test were used to evaluate the structures, morphologies and electrochemical performance of samples, respectively. The results show that the nanocomposites are composed of one-dimensional nanobelts, preserving the morphology of the precursor well, and the hydrothermal reaction time has a significant effect on the phase contents and electrochemical performance of the composites. Compared with pure V2O5, V2O5/NaV6O15 nanocomposites exhibit enhanced electrochemical performance as cathode for sodium-ion batteries. It should be ascribed to the synergistic effect between V2O5 with high capacity and NaV6O15 with good cycling performance, and the introduced massive interfacial areas which can provide additional ion storage sites and improve the electronic and ionic conductivities.
Key words: V2O5/NaV6O15; nanocomposite; cathode material; sodium-ion battery