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Issue 15, 2018
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Coupled X-ray diffraction and electrochemical studies of the mixed Ti/V-containing NASICON: Na2TiV(PO4)3

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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 with combining macron]c, a = 8.610(3) Å, c = 21.755(6) Å) 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.

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

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Article information


Submitted
05 Dec 2017
Accepted
05 Mar 2018
First published
06 Mar 2018

J. Mater. Chem. A, 2018,6, 6654-6659
Article type
Paper

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

F. Lalère, V. Seznec, M. Courty, J. N. Chotard and C. Masquelier, J. Mater. Chem. A, 2018, 6, 6654
DOI: 10.1039/C7TA10689K

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