Preparation and Electrochemical Performance of V 2 O 5 /Flake Graphite Material for Aqueous Zinc-Ion Battery

Aqueous zinc batteries with low cost and inherent safety are considered to be the most promising energy storage devices. V 2 O 5 /Flake graphite material have been successfully synthesized via high-temperature magnetic stirring and sintering method. V 2 O 5 /Flake graphite material were characterized by X-ray diffraction, FESEM, XPS and TGA. The addition of flake graphite not only improves the conductivity of the cathode material, provides more active sites for the Zn 2+ insertion/extraction process, but also has a certain isolation effect, avoiding the direct contact between the electrolyte and the V 2 O 5 to cause dissolution. VC51 delivers a high discharge capacity of 328.1 mA h g –1 at 0.1 A g –1 , good capacity retention of 81.4% after 300 cycles, shows good cycling stability.