Investigation of sodium storage in manganese vanadate MnV2O6 nanobelt and nanoparticle as an anode for sodium-ion batteries

Manganese vanadate (MnV2O5) 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 MnV2O5 is transformed to a low crystalline phase during the first sodiation without a further amorphization, which is different from MnV2O5/Li cell and results in a relatively low reversible capacity in MnV2O5/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). (C) 2020 Elsevier Ltd. All rights reserved.