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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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Publication details

The article was received on 04 Jul 2019, accepted on 02 Sep 2019 and first published on 02 Sep 2019


Article type: Communication
DOI: 10.1039/C9CC05137F
Chem. Commun., 2019,55, 11719-11722

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    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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