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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Drejer, Andreas Østergaard
University of Southern Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2022An Easy-to-Use Custom-Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteriescitations
- 2022An Easy‐to‐Use Custom‐Built Cell for Neutron Powder Diffraction Studies of Rechargeable Batteriescitations
- 2020The Effect of oxygen defects on the structural evolution of LiVPO4F1−yoy cathode materialscitations
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article
The Effect of oxygen defects on the structural evolution of LiVPO4F1−yoy cathode materials
Abstract
<p>Lithium vanadium fluorophosphate, LiVPO<sub>4</sub>F, is a promising cathode material for Li-ion batteries because of its high intercalation potential (4.24 V vs Li/Li<sup>+</sup>) and high stability. However, recent studies show that as-synthesized LiVPO<sub>4</sub>F very often contains oxygen defects on the fluoride site giving rise to a general composition of LiVPO<sub>4</sub>F<sub>1</sub>−<sub>y</sub>O<sub>y</sub> with vanadium in a mixed +III/+IV valence state. The inclusion of oxygen naturally influences the electrochemical properties greatly, and a thorough material characterization is necessary to understand the performance. In this study, we synthesize lithium vanadium fluorophosphate by two common strategies: solid-state and hydrothermal synthesis. We show that solid-state synthesis provides LiVPO<sub>4</sub>F, while the hydrothermal method, in contrast to previous reports, leads to the inclusion of ca. 35% oxygen on the fluoride site and significant disorder in the material. The different electrochemical properties were probed by operando synchrotron X-ray powder diffraction to investigate the effects of oxygen inclusion on the structural evolution during electrochemical lithiation and delithiation. This reveals that while LiVPO<sub>4</sub>F exhibits a typical biphasic phase evolution, the sample with oxygen inclusion on the fluoride site displays extended solid-solution behavior. This explains previous observations of improved capacity retention due to defects.</p>