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Insights into the charge storage mechanism of Na3V2(PO4)3 cathode in sodium-ion batteries
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Insights into the charge storage mechanism of Na3V2(PO4)3 cathode in sodium-ion batteries
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Journal Article
Insights into the charge storage mechanism of Na3V2(PO4)3 cathode in sodium-ion batteries
2023
Overview
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 × 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.
Publisher
Indian Academy of Sciences,Springer Nature B.V
