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    • Keywords


      Na-ion battery; Na$_3$V$_2$(PO$_4$)$_3$; charge storage mechanism; cathode.

    • Abstract


      The NASICON-type Na$_3$V$_2$(PO$_4$)$_3$ (NVP) material was synthesized through the sol–gel route and characterized as cathode in sodium-ion battery by the cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT) as well as electrochemical impedance spectroscopy (EIS) methods. Scan rate-dependent CV demonstrates an approximate diffusion-type behaviour and gives the diffusion coefficient value 5.24 ${\times}$ 10$^{–11}$ cm$^2$ s$^{–1}$ for Na$^+$ in NVP. Both GITT and EIS tests demonstrate the U-shape diffusion coefficients for Na$^+$ correlated to stoichiometry ranging from 10$^{–16}$ to 10$^{–11}$ cm$^2$ s$^{–1}$, where bottom of the diffusion rate corresponding the plateau voltage well matches with CV data. The strong interaction between the main skeleton and Na$^+$ during the two-phase reaction as demonstrated by the X-ray diffraction results was believed as the reason that reduces the diffusion rate of Na$^+$ at the plateau voltage.

    • Author Affiliations



      1. College of Mechanical Engineering, College of Mathematics and Physics, Qingdao University of Science and Technology (QUST), Qingdao 266061, China
      2. Institute of Technology, Qingdao Hengxing University of Science and Technology, Qingdao 266061, China
    • Dates

  • Bulletin of Materials Science | News

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