Structural and electrochemical studies of a new tavorite composition : LiVPO4OH

Edouard Boivin; Jean-Noël Chotard; Michel Ménétrier; Lydie Bourgeois; Tahya Bamine; Dany Carlier; François Fauth; Emmanuelle Suard; Christian Masquelier; Laurence Croguennec

Structural and electrochemical studies of a new tavorite composition : LiVPO4OH

Edouard Boivin ^{1, 2, 3} Jean-Noël Chotard ^{1, 4, 3} Michel Ménétrier ^{2, 4} Lydie Bourgeois ⁵ Tahya Bamine ^{2, 3} Dany Carlier ^{2, 3} François Fauth ⁶ Emmanuelle Suard ⁷ Christian Masquelier ^{1, 4, 3} Laurence Croguennec ^{2, 4, 3}

1 LRCS - Laboratoire réactivité et chimie des solides

2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

3 RS2E - Réseau sur le stockage électrochimique de l'énergie

4 Advanced Lithium Energy Storage Systems - ALISTORE (FRANCE)

5 ISM - Institut des Sciences Moléculaires

6 ESRF - European Synchrotron Radiation Facility

7 ILL - Institut Laue-Langevin

Abstract : Polyanionic materials attract strong interest in the field of Li-ion battery research thanks to the wide range of compositions, structures and electrochemical properties they offer. Tavorite-type compositions offer a very rich crystal chemistry, among which LiVPO4F has the highest theoretical energy density (i.e. 655 W h kg−1). A new Tavorite-type LiVPO4OH composition was synthesized by a hydrothermal route from three different vanadium-containing precursors. The crystal structure of this new phase was fully determined thanks to synchrotron X-ray and neutron diffraction. 1H, 7Li, and 31P magic angle spinning nuclear magnetic resonance spectroscopy as well as diffuse reflectance infra-red spectroscopy were performed in order to support further the nature of the phases formed. Galvanostatic intermittent titration technique experiments in lithium batteries and ex situ X-ray diffraction analyses revealed that during oxidation the concomitant extraction of Li+ and H+ occurs at the same equilibrium potential (3.95 V vs. Li+/Li) and leads to the formation of the Tavorite phase VPO4O at the end of the charge. LiVPO4OH is also electrochemically active in the low voltage region, upon Li+ insertion. The reversible insertion/extraction of lithium at 1.35 V vs. Li+/Li leads to the formation of Li2VPO4OH at the end of discharge.

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Article dans une revue

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Chimie / Matériaux

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https://hal.archives-ouvertes.fr/hal-01348196
Contributeur : Stéphane Toulin <>
Soumis le : vendredi 22 juillet 2016 - 15:35:36
Dernière modification le : mardi 18 juin 2019 - 13:38:01

Structural and electrochemical studies of a new tavorite composition : LiVPO4OH

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