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Effect of Iron Substitution in the Electrochemical Performance of Na3V2(PO4)3as Cathode for Na-Ion Batteries

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Aragón, M. J., Lavela, P., Ortiz, G. F., Tirado, J. L.·2015·Journal of The Electrochemical Society

Abstract

Na 3 V 2-x Fe x (PO 4 ) 3 /C (0 ≤ x ≤ 0.5) samples were prepared by a simple sol-gel method. X-ray diffraction patterns revealed high purity and crystalline phosphate indexed in the R-3c space group. On increasing the iron content, the cell volume increases due to the slightly higher radius of Fe 3+ . Cyclic voltammetry showed two signals at ca. 3.5 and 4.0 V, which evidence a linear dependence of potential on the level of substitution. The appearance of the short plateau at ca. 4.0 V is closely related to the higher iron substitution levels. The evaluation of XPS and 57 Fe Mössbauer spectra of charged and discharged electrodes allow ascribing the 4.0 V plateau to V 4+ /V 5+ redox reaction and the extraction/insertion of extra sodium ions from octahedral M1 sites. Galvanostatic cycling showed capacity values as high as 115 mA h g −1 for samples with x = 0.1, 0.2, 0.3 and exceptional cyclability.

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Metadata

Authors
Aragón, M. J., Lavela, P., Ortiz, G. F., & Tirado, J. L.
Venue
Journal of The Electrochemical Society
Published
2015
Volume
162
Issue
2
Pages
A3077-A3083
ISSN
  • 0013-4651 (ISSN-L)
  • 1945-7111
OpenAlex
W1983020788
Cited by
170
References
1
FWCI
9.94
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Effect of Iron Substitution in the Electrochemical Performance of Na3V2(PO4)3as Cathode for Na-Ion Batteries. https://app.cochat.ai/papers/10.1149/2.0151502jes
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Aragón, M. J., Lavela, P., Ortiz, G. F., & Tirado, J. L. (2015). Effect of Iron Substitution in the Electrochemical Performance of Na3V2(PO4)3as Cathode for Na-Ion Batteries. Journal of The Electrochemical Society. https://doi.org/10.1149/2.0151502jes

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