Synthesis and electrochemical properties of spherically shaped LiVPO ₄ F/C cathode material by a spray drying–roasting method

Abstract

Abstract LiVPO 4 F has attracted increasing research interest in the field of Li‐ion batteries due to its high working voltage platform and high theoretical energy density. However, the construction of stable LiVPO 4 F cathode material with excellent electrochemical properties is still a major challenge. Herein, we successfully synthesized spherically shaped LiVPO 4 F/C via a spray drying–roasting method. X‐ray diffraction (XRD) and scanning electron microscopy (SEM) results indicate that the well crystallized LiVPO 4 F/C with triclinic structure shows spherical morphology with an average diameter of 1–3 μm. The spherically shaped LiVPO 4 F/C delivers a discharge capacity of 137.9 mAh·g −1 at 0.1C rate in the range of 3.0–4.5 V and remains 91.4% capacity retention of its initial discharge capacity after 50 cycles. These results reveal that spray drying–roasting method is a promising approach to synthesize spherically shaped LiVPO 4 F/C cathode material with stable crystal structure and excellent performance.