BOIVIN, Edouard; CHOTARD, Jean-Noël; MÉNÉTRIER, Michel; BOURGEOIS, Lydie; BAMINE, Tahya; CARLIER, Dany; FAUTH, François; MASQUELIER, Christian; CROGUENNEC, Laurence

doi:10.1021/acs.jpcc.6b07342

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BOIVIN, Edouard
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHOTARD, Jean-Noël
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]

MÉNÉTRIER, Michel
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Article de revue

Ce document a été publié dans

Journal of Physical Chemistry C. 2016, vol. 120, n° 46, p. 26187-26198

American Chemical Society

Résumé en anglais

Tavorite-type compositions offer a very rich crystal chemistry, among which LiVIIIPO4F has the highest theoretical energy density (i.e., 655 Wh/kg). In this article, an in-depth study of vanadyl-type defects generated by temperature-controlled oxidation of LiVIIIPO4F under air is proposed, and the influence of the defects on the electrochemical properties is demonstrated. A combination of high resolution synchrotron diffraction, infrared spectroscopy, and magic angle spinning nuclear magnetic resonance was used to fully characterize the materials thus generated, from their average long-range structure to their local structure with the presence of defects. The increase of the annealing temperature tends to substitute oxygen for fluorine with the formation of a series of LiVPO4F1–xOx compositions. The miscibility domains appear to be narrow at the two ends of the solid solution (i.e., in the composition ranges LiVPO4F[1-0.9]O[0-0.1] and LiVPO4F[0-0.1]O[1-0.9]). The presence of vanadyl-type defects obtained as localized or more extended ones, depending on the annealing conditions, affects drastically the electrochemical properties of these Tavorite LiVPO4F-type materials.< Réduire

DOI

http://dx.doi.org/10.1021/acs.jpcc.6b07342

Project ANR

Laboratory of excellency for electrochemical energy storage - ANR-10-LABX-0076
Development of New High Voltage Positive Electrodes for Sustainable Li-Ion Batteries - ANR-12-PRGE-0005

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Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026