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- Title
Insights into the charge storage mechanism of Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> cathode in sodium-ion batteries.
- Authors
Li, Bo; Liu, Jing; Xiu, Xia; Yang, Guanglei; Zhu, Kaixing
- Abstract
The NASICON-type Na3V2(PO4)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 cm2 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 cm2 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.
- Publication
Bulletin of Materials Science, 2023, Vol 46, Issue 2, p1
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-023-02937-z