One-step synthesis of Li3V 2(PO4)3 /C positive material with high performance for lithium-ion batteries

Li3V 2(PO4)3/C positive material was synthesized via a one-step solid-state reaction route using humic acid as both reduction agent and carbon source. The SEM image shows that the particles merge with each other to form a porous structure. This microstructure helps the electrolyte to penetrate the positive materials and promotes good electronic contact among Li3V 2(PO4)3 particles. Electrochemical tests display that the Li3V 2(PO4)3/C positive material reaches an initial discharge capacity of 131.2 mA h g−1 at 0.2 C and exhibits a good cyclic performance at 3 C charge/discharge rates in the range of 3.0–4.3 V. The results indicate that the one-step solid-state reaction is a promising method suitable for mass production of Li3V 2(PO4)3/C material with high electrochemical performance.