Superior lithium storage performance of polyacrylonitrile-modified NASICON structure Na3V2(PO4)3 materials.

Nanoparticle Na₃V₂(PO₄)₃/C materials with different polyacrylonitrile contents can be successfully synthesized using precipitation method. As an energy storage material used in the production of lithium batteries which is also compared with pure of that, the Na₃V₂(PO₄)₃/C not only has a larger capacity, but also has a very high cycle stability. In particular, the initial discharge capacities of the Na₃V₂(PO₄)₃/C sample annealed at 750°C containing 10 wt% of polyacrylonitrile are 130.9 and 122.2 mAh g⁻¹ at current densities of 0.5 and 1 C, respectively; the corresponding coulomb efficiencies are 97.3 and 99.5%. It is also worth noting that the capacity retention can reach as high as 92.7% for 500 cycles at 1 C. [ABSTRACT FROM AUTHOR]