Synthesis and electrochemical properties of spherically shaped LiVPO4F/C cathode material by a spray drying-roasting method

LiVPO4F 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 LiVPO4F cathode material with excellent electrochemical properties is still a major challenge.Herein,we successfully synthesized spherically shaped LiVPO4F/C via a spray dryingroasting method.X-ray diffraction(XRD) and scanning electron microscopy(SEM) results indicate that the well crystallized LiVPO4F/C with triclinic structure shows spherical morphology with an average diameter of 1-3 μm.The spherically shaped LiVPO4F/C delivers a discharge capacity of 137.9 mAh·g-1at 0.1 C rate in the range of3.0-4.5 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 LiVPO4F/C cathode material with stable crystal structure and excellent performance.