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Issue 78, 2019
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Aluminum substitution for vanadium in the Na3V2(PO4)2F3 and Na3V2(PO4)2FO2 type materials

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Abstract

Among the positive electrode materials for Na-ion batteries, Na3V2(PO4)2F3 is considered as one of the most promising and generates high interest. Here, we study the influence of the sol–gel synthesis parameters on the structure and on the electrochemical signature of the partially substituted Na3V2−zAlz(PO4)2(F,O)3 materials. We demonstrate that the acidity of the starting solution influences the vanadium oxidation state of the final product. For the first time we report on the possibility of controlling the double Al/V and O/F substitution that leads to the preparation of the Na3V2−zAlz(PO4)2F1+zO2−z solid solution.

Graphical abstract: Aluminum substitution for vanadium in the Na3V2(PO4)2F3 and Na3V2(PO4)2FO2 type materials

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Article information


Submitted
04 Jul 2019
Accepted
02 Sep 2019
First published
02 Sep 2019

Chem. Commun., 2019,55, 11719-11722
Article type
Communication

Aluminum substitution for vanadium in the Na3V2(PO4)2F3 and Na3V2(PO4)2FO2 type materials

J. Olchowka, L. H. B. Nguyen, T. Broux, P. Sanz Camacho, E. Petit, F. Fauth, D. Carlier, C. Masquelier and L. Croguennec, Chem. Commun., 2019, 55, 11719
DOI: 10.1039/C9CC05137F

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