Article Dans Une Revue Nature Materials Année : 2025

Obtaining V2(PO4)3 by sodium extraction from single-phase NaxV2(PO4)3 (1 < x < 3) positive electrode materials

Résumé

We report on single-phase NaxV2(PO4)3 compositions (1.5 ≤ x ≤ 2.5) of the Na super ionic conductor type, obtained from a straightforward synthesis route. Typically, chemically prepared c-Na2V2(PO4)3, obtained by annealing an equimolar mixture of Na3V2(PO4)3 and NaV2(PO4)3, exhibits a specific sodium-ion distribution (occupancy of the Na(1) site of only 0.66(4)), whereas that of the electrochemically obtained e-Na2V2(PO4)3 (from Na3V2(PO4)3) is close to 1. Unlike conventional Na3V2(PO4)3, when used as positive electrode materials in Na-ion batteries, the NaxV2(PO4)3 compositions lead to unusual single-phase Na+ extraction/insertion mechanisms with continuous voltage changes upon Na+ extraction/insertion. We demonstrate that the average equilibrium operating voltage observed upon Na+ deintercalation from single-phase Na2V2(PO4)3 is increased up to an average value of ~3.70 V versus Na+/Na (thanks to the activation of the V4+/V5+ redox couple) compared to 3.37 V versus Na+/Na in conventional Na3V2(PO4)3, thus leading to an increase in the theoretical energy density from 396.3 Wh kg–1 to 458.1 Wh kg–1. Electrochemical and chemical Na+ deintercalation from c-Na2V2(PO4)3 enables complete Na-ion extraction, increasing energy density.

Domaines

Matériaux
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Année Mois Jours
Avant la publication
mardi 29 avril 2025
Fichier sous embargo
0 2 10
Année Mois Jours
Avant la publication
mardi 29 avril 2025
Fichier sous embargo
0 2 10
Année Mois Jours
Avant la publication
mardi 29 avril 2025
Recherche Data Gouv

Cite 10.57745/DEC505 Jeu de données Croguennec, Laurence; Park, Sunkyu; Wang, Ziliang; Choudhary, Kriti; Chotard, Jean-Noël; Carlier, Dany; Fauth, François; Canepa, Pieremanuele; Masquelier, Christian, 2024, "Reaching V2(PO4)3 by sodium extraction from single-phase NaxV2(PO4)3 (1 < x < 3) positive electrode materials", https://doi.org/10.57745/DEC505, Recherche Data Gouv, V1, UNF:6:67x92Uvt2gY7NICJGnIEcA== [fileUNF]

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mardi 29 avril 2025
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Dates et versions

hal-04756781 , version 1 (29-10-2024)

Identifiants

Citer

Sunkyu Park, Ziliang Wang, Kriti Choudhary, Jean-Noël Chotard, Dany Carlier, et al.. Obtaining V2(PO4)3 by sodium extraction from single-phase NaxV2(PO4)3 (1 < x < 3) positive electrode materials. Nature Materials, 2025, 24 (2), pp.234-242. ⟨10.1038/s41563-024-02023-7⟩. ⟨hal-04756781⟩
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