Preparation for honeycombed Li3V2(PO4)3/C composites via vacuum-assisted immersion method and their high-rates performance in lithium-ion batteries

Abstract It is worthy of attention that the honeycombed Li3V2(PO4)3/C composites have been prepared and used as the cathode materials for lithium-ion batteries. The honeycombed Li3V2(PO4)3/C composites were synthesized via vacuum-assisted immersion method using the dandelion fibers as the biomass-carbon templates. The composites were characterized using X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The honeycombed Li3V2(PO4)3/C composites exhibit a capacity of 123.40 mA h g−1 and a prominent capacity retention of 98.78% at the 0.2 C rate, while the rate capacity retention is as high as 88.84% at 15 C rates. It is demonstrated that the unique honeycombed structure is beneficial for improving structural stability and Li+ diffusion coefficient of the lithium ion batteries, and then enhance the high-rates and cycle performance.