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Batteries 2018, 4(3), 32; https://doi.org/10.3390/batteries4030032

Effect of La3+ Modification on the Electrochemical Performance of Na3V2(PO4)2F3

1
Institute of Solid State Chemistry and Mechanochemistry SB RAS, 18 Kutateladze, 630128 Novosibirsk, Russia
2
Ecole Nationale Supérieure de Chimie de Lille, CS 90108, 59652 Villeneuve d’Ascq CEDEX, France
*
Author to whom correspondence should be addressed.
Received: 25 May 2018 / Revised: 19 June 2018 / Accepted: 29 June 2018 / Published: 9 July 2018
(This article belongs to the Special Issue Sodium-Ion Battery: Materials and Devices)
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Abstract

La3+ modification of Na3V2(PO4)2F3 was performed by the direct mechanochemically assisted solid-state synthesis of the Na3V2−xLax(PO4)2F3 compositions, and by the LaPO4 coating of the as-prepared Na3V2(PO4)2F3 via the precipitation method. It has been shown that no noticeable substitution of the V3+ ions by the La3+ ions occurs in the Na3V2(PO4)2F3 structure under the synthesis conditions; meanwhile, the introduction of the La3+ ions into the reagent mixture leads to the formation of the LaPO4 phase, and accordingly, an increase in the NaF/VPO4 ratio. The latter results in the formation of the Na3PO4 and Na3VF6 surface impurity phases, which possess high ionic and electronic conductivity, respectively, and significantly enhances the electrical conductivity and the cycling performance of the composite cathode material both in Na and Li cells, while simple surface modification of Na3V2(PO4)2F3 by LaPO4 via precipitation does not. View Full-Text
Keywords: Na3V2(PO4)2F3; mechanical activation; La3+ modification; cycling in Na+ and Li+ cells Na3V2(PO4)2F3; mechanical activation; La3+ modification; cycling in Na+ and Li+ cells
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kosova, N.V.; Rezepova, D.O.; Montroussier, N. Effect of La3+ Modification on the Electrochemical Performance of Na3V2(PO4)2F3. Batteries 2018, 4, 32.

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