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Iron substitution in Na4VMn(PO4)3 as a strategy for improving the electrochemical performance of sodium-ion batteries

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Author
Lavela Cabello, Pedro
Klee, R.
Hidalgo, M.A.
Tirado Coello, José Luis
Publisher
Elsevier
Date
2021
Subject
Sodium-ion batteries
Cathode material
NASICON
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Abstract
Six NASICON type samples with Na4-xVFexMn1-x(PO4)3 (0 ≤ x ≤ 1) stoichiometry are examined as positive electrodes for sodium-ion batteries. The structural, morphological, and chemical state of elements in raw samples is unveiled by XRD diffraction, electron microscopy, and Raman and XPS spectroscopies. The effect of the dual Fe/Mn substitution is examined by electrochemical tests using both voltammetric and galvanostatic methods. The results reveal the beneficial effect of the iron substitution, justified by an improvement of the kinetic response, and supported by the calculation of the apparent diffusion coefficients and internal cell resistance.
URI
http://hdl.handle.net/10396/21545
Fuente
Journal of Electroanalytical Chemistry 895, 115533 (2021)
Versión del Editor
http://dx.doi.org/10.1016/j.jelechem.2021.115533
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