Abstract
Nanocomposite electrode materials can display superior electrochemical performances and behavior via the synergistic effect of different phases in nanoscale. Here, a stable multiphase Li2.5Na0.5V2(PO4)3 (LNVP)/bioxarbon (BC) nanocomposite with 3D hierarchical porous structure was synthesized by self-assembling of cations in the yeast cell and partial substitution of Li+ to Na+ ions. The results of XRD rietveld refinement and high magnification TEM-SAED show that the multiphase LNVP is composed of different nanocrystalline particles including monoclinic Li3V2(PO4)3 (M-LVP), rhombohedral Li3V2(PO4)3 (R-LVP) and rhombohedral Na3V2(PO4)3 (R-NVP). The synthesis mechanism and the electrochemical reactions were clarified. The multiphase LNVP/BC nanocomposite cathode delivered a high discharge capacity of 116.04 mAh g−1 and the capacity retention reached 68.9% after 800 cycles under a high current rate of 10 C between 3.0 and 4.3 V. It can also be used as a cathode material in sodium ions batteries and delivered an excellent electrochemical performances.
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