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Abstract: A NASICON-based Na3V2
(PO4
)2F3
(NVPF) cathode material is reported herein as a
potential symmetric cell electrode material. The symmetric cell was active from 0 to 3.5 V and showed
a capacity of 85 mAh/g at 0.1 C. With cycling, the NVPF symmetric cell showed a very long and
stable cycle life, having a capacity retention of 61% after 1000 cycles at 1 C. The diffusion coefficient
calculated from cyclic voltammetry (CV) and the galvanostatic intermittent titration technique (GITT)
was found to be ~10−9–10−11, suggesting a smooth diffusion of Na+
in the NVPF symmetric cell.
The electrochemical impedance spectroscopy (EIS) carried out during cycling showed increases
in bulk resistance, solid electrolyte interphase (SEI) resistance, and charge transfer resistance with
the number of cycles, explaining the origin of capacity fade in the NVPF symmetric cell. Finally,
the postmortem analysis of the symmetric cell after 1000 cycles at a 1 C rate indicated that the
intercalation/de-intercalation of sodium into/from the host structure occurred without any major
structural destabilization in both the cathode and anode. However, there was slight distortion in the
cathode structure observed, which resulted in capacity loss of the symmetric cell. The promising
electrochemical performance of NVPF in the symmetric cell makes it attractive for developing
long-life and cost-effective batteries
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