| Title: | Effects of a Mixed O/F Ligand in the Tavorite-Type LiVPO4O Structure |
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| Authors: | ID Semsari Parapari, Sorour, KI (Author)
ID Ateba Mba, Jean-Marcel, KI (Author)
ID Tchernychova, Elena, KI (Author)
ID Mali, Gregor, KI (Author)
ID Arčon, Iztok, UNG (Author)
ID Kapun, Gregor, KI (Author)
ID Gülgün, Mehmet Ali, Sabanci University (Author)
ID Dominko, Robert, KI (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | We report the synthesis and detailed structural
and chemical characterization including electrochemical
properties of a lithium vanadium oxy/fluoro-phosphate
material. To the best of our knowledge, we have for the first
time synthesized a LiVPO4O-type phase with a mixed O/F
ligand. In the synthesis procedure, the LiVPO4O precursor
compound was fluorinated via LiF incorporation, with
preservation of the LiVPO4O framework structure. The
operating potential of the synthesized material is increased
compared to that of the LiVPO4O precursor (4.12 V vs 3.95 V
versus metallic lithium, respectively). The related increase in
operating potential was assigned to the effect of the
intermixing O/F ligand, which is attained via the successful
fluorine incorporation into the LiVPO4O structure. A characterization of the investigated materials was performed using
microscale-covering XRD, XANES, and NMR techniques as well as nanoscale spatially resolved imaging and analytical STEM
techniques. The obtained oxy/fluoro-phosphate phase is isostructural to LiVPO4O; however, the presence of the mixed O/F
ligand promoted a higher symmetry of vanadium octahedra. These variations of the vanadium local environment along with the
observed inhomogeneous distribution of the incorporated fluorine gave rise to the minor local deviations in vanadium valence.
Our results clearly emphasize the connection among the fluorine ligand incorporation, its local distribution, and the
electrochemical properties of the material. |
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| Keywords: | LiVPO4O, XRD, SEM, V XANES, Tavorite-Type, electrochemical properties |
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| Publication version: | Version of Record |
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| Year of publishing: | 2020 |
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| Number of pages: | 262-272 |
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| Numbering: | 32 |
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| PID: | 20.500.12556/RUNG-5036-f0a6e776-6877-88fe-245c-8ee11b7485c7 |
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| COBISS.SI-ID: | 5566971 |
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| DOI: | 10.1021/acs.chemmater.9b03698 |
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| NUK URN: | URN:SI:UNG:REP:CRGOEDPI |
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| Publication date in RUNG: | 17.02.2020 |
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| Views: | 3804 |
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| Downloads: | 0 |
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