ATEBA MBA, Jean-Marcel; CROGUENNEC, Laurence; BASIR IRWIN, Nor; BARKER, Jerry; MASQUELIER, Christian

doi:10.1149/2.022208jes

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ATEBA MBA, Jean-Marcel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]

CROGUENNEC, Laurence
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]

BASIR IRWIN, Nor
Laboratoire réactivité et chimie des solides - UMR CNRS 7314 UPJV [LRCS]

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Journal of The Electrochemical Society. 2012, vol. 159, n° 8, p. A1171-A1175

Electrochemical Society

Resumen en inglés

The Tavorite-type composition LiVPO4F undergoes a complex series of phase transformations upon Li+ electrochemical extraction or insertion at ∼4.25 V (V4+/V3+ redox couple) and 1.8 V vs. Li (V3+/V2+ redox couple), respectively. In all the reactions involved, followed by in-house in situ X-Ray diffraction, two-phase topotactic mechanisms are systematically encountered, without noticeable modification of the [VPO4F] framework besides significant unit-cell contractions/expansions and overall shifts in symmetry from triclinic P-1 to monoclinic C2/c. Two electrochemical oxidation reactions occur at 4.24 V and 4.28 V vs. Li due to the formation of the intermediate phase Li0.67VPO4F, isolated for the first time. Noticeably, this peculiar composition is not encountered upon reduction from VPO4F to LiVPO4F.< Leer menos

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X-ray diffraction

Tavorite

Lithium batteries

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Lithium insertion or extraction from/into tavorite-type LiVPO4F : an in situ x-ray diffraction study

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