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Coupled X-ray diffraction and electrochemical studies of the mixed Ti/V-containing NASICON: Na2TiV(PO4)(3)

Abstract : The solid state synthesis of NaTiV(PO4)(3) and Na3TiV(PO4)(3) is reported. Soft chemical oxidation of the latter composition led to NASICON Na2TiV(PO4)(3) with intermediate unit cell parameters (s.g.: R (3) over barc, a = 8.610(3) angstrom, c = 21.755(6) angstrom) when compared to NaTiV(PO4)(3) and Na3TiV(PO4)(3). Coupled structural/electrochemical studies were carried out on Na2TiV(PO4)(3) for oxidation and reduction by operando X-ray diffraction. While the oxidation mechanism towards NaTiV(PO4)(3) is quite simple, the reduction mechanisms involve several mono-and bi-phasic mechanisms leading to Na3TiV(PO4)(3) as an intermediate composition and to Na4TiV(PO4)(3) eventually.
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https://hal-u-picardie.archives-ouvertes.fr/hal-03611097
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Soumis le : mercredi 16 mars 2022 - 18:57:21
Dernière modification le : mardi 27 septembre 2022 - 04:05:51

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F. Lalere, V. Seznec, M. Courty, J. N. Chotard, C. Masquelier. Coupled X-ray diffraction and electrochemical studies of the mixed Ti/V-containing NASICON: Na2TiV(PO4)(3). Journal of Materials Chemistry A, Royal Society of Chemistry, 2018, 6 (15), pp.6654-6659. ⟨10.1039/c7ta10689k⟩. ⟨hal-03611097⟩

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