Facile synthesis technology of Li₃V₂(PO₄)₃/C adding H₂O₂ in ball mill process

Highlights: • Sintering time of Li₃V₂(PO₄)₃ reduced to 6 hours by adding hydrogen peroxide. • Electrochemical performance of Li₃V₂(PO₄)₃ was improved by reducing sintering time. • The Li₃V₂(PO₄)₃ production process was simplified during material synthesis stage. - Abstract: Li₃V₂(PO₄)₃/C has stable structure, high theory specific capacity and good safety performance, therefore it has become the research focus of lithium-ion batteries in recent years. The facile synthesis technology of Li₃V₂(PO₄)₃/C was characterized by adding different amounts of H₂O₂. Structure and morphology characteristics were examined by XRD, TG, Raman Spectroscopy, XPS and SEM. Electrochemical performance was investigated by constant current charging and discharging test. The results revealed that the Li₃V₂(PO₄)₃/C electrochemical performance of adding 15 mL H₂O₂ was better after sintering during 6 h. At the charge cut-off voltage of 4.3 V, the first discharge capacity at 0.2 C rate reached 127 mAh g⁻¹. Because of adding H₂O₂ in the ball-mill dispersant, the vanadium pentoxide formed the wet sol. The molecular-leveled mixture increased the homogeneity of raw materials. Therefore, the addition of H₂O₂ shortened the sintering time and significantly improved the electrochemical performance of Li₃V₂(PO₄)₃/C.