A stable and superior performance of Na3V2(PO4)3/C nanocomposites as cathode for sodium-ion batteries

Na3V2(PO4)(3) suffers from poor performance and cyclability arising from low electronic conductivity. Na3V2(PO4)(3) nanosheets have been successfully synthesized by a hydrothermal method and coated with a carbon layer from beta-cyclodextrin. The NVP/C nanocomposite shows superior high-rate and ultralong-lifespan performances owning to large number of oxygenous groups from beta-cyclodextrin, which are beneficial to a uniform adsorption on the surface of electrode materials. The NVP/C delivers 74 mAh g(-1) even after 2000 cycles at a rate of 20 C and an exceptional rate performance (66 mAh g(-1) at 50 C).