Effect of Fe-doping followed by C+SiO2 hybrid layer coating on Li3V2(PO4)3 cathode material for lithium-ion batteries

Abstract A novel Li 3 V 2 (PO 4 ) 3 composite modified with Fe-doping followed by C+SiO 2 hybrid layer coating (LVFP/C-Si) is successfully synthesized via an ultrasonic-assisted solid-state method, and characterized by XRD, XPS, TEM, galvanostatic charge/discharge measurements, CV and EIS. This LVFP/C-Si electrode shows a significantly improved electrochemical performance. It presents an initial discharge capacity as high as 170.8 mA h g −1 at 1 C, and even delivers an excellent initial capacity of 153.6 mA h g −1 with capacity retention of 82.3% after 100 cycles at 5 C. The results demonstrate that this novel modification with doping followed by hybrid layer coating is an ideal design to obtain both high capacity and long cycle performance for Li 3 V 2 (PO 4 ) 3 and other polyanion cathode materials in lithium ion batteries.