LAUSR

Abstract Manganese vanadate (MnV2O6) nanobelts (MVO-NBs) and nanoparticles (MVO-NPs) with a brannerite structure are synthesized by hydrothermal and high energy mechanical milling methods, respectively, and their electrochemical properties as an anode for sodium-ion batteries (SIBs) are investigated. Ex-situ X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) studies indicate that MnV2O6 is transformed to a low crystalline phase during the first sodiation without a further amorphization, which is different from MnV2O6/Li cell and results in a relatively low reversible capacity in MnV2O6/Na cell. The MVO-NB electrode exhibits the better electrochemical performance than MVO-NP electrode, possibly due to the fast diffusion kinetics resulting from the short diffusion length. The MVO-NB electrode shows a stable long-term cycle stability, delivering a reversible capacity of 110 mA h g−1 after 1000 cycles at a high current density of 500 mA g−1.