Chen, Ruiyong ; Ren, Shuhua ; Yavuz, Murat ; Guda, Alexander A. ; Shapovalov, Viktor ; Witter, Raiker ; Fichtner, Maximilian ; Hahn, Horst (2015)
Li+intercalation in isostructural Li2VO3and Li2VO2F with O2−and mixed O2−/F−anions.
In: Phys. Chem. Chem. Phys., 17 (26)
doi: 10.1039/c5cp02505b
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Mixed-anion materials for Li-ion batteries have been attracting attention in view of their tunable electrochemical properties. Herein, we compare two isostructural (Fm (3) over barm) model intercalation materials Li2VO3 and Li2VO2F with O2- and mixed O2-/F- anions, respectively. Synchrotron X-ray diffraction and pair distribution function data confirm large structural similarity over long-range and at the atomic scale for these materials. However, they show distinct electrochemical properties and kinetic behaviour arising from the different anion environments and the consequent difference in cationic electrostatic repulsion. In comparison with Li2VO3 with an active V4+/5+ redox reaction, the material Li2VO2F with oxofluoro anions and the partial activity of V3+/5+ redox reaction favor higher theoretical capacity (460 mA h g(-1) vs. 230 mA h g(-1)), higher voltage (2.5 V vs. 2.2 V), lower polarization (0.1 V vs. 0.3 V) and faster Li+ chemical diffusion (similar to 10(-9) cm(2) s(-1) vs. similar to 10(-11) cm(2) s(-1)). This work not only provides insights into the understanding of anion chemistry, but also suggests the rational design of new mixed-anion battery materials.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Chen, Ruiyong ; Ren, Shuhua ; Yavuz, Murat ; Guda, Alexander A. ; Shapovalov, Viktor ; Witter, Raiker ; Fichtner, Maximilian ; Hahn, Horst |
| Art des Eintrags: | Bibliographie |
| Titel: | Li+intercalation in isostructural Li2VO3and Li2VO2F with O2−and mixed O2−/F−anions |
| Sprache: | Englisch |
| Publikationsjahr: | 2015 |
| Verlag: | The Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Phys. Chem. Chem. Phys. |
| Jahrgang/Volume einer Zeitschrift: | 17 |
| (Heft-)Nummer: | 26 |
| DOI: | 10.1039/c5cp02505b |
| Kurzbeschreibung (Abstract): | Mixed-anion materials for Li-ion batteries have been attracting attention in view of their tunable electrochemical properties. Herein, we compare two isostructural (Fm (3) over barm) model intercalation materials Li2VO3 and Li2VO2F with O2- and mixed O2-/F- anions, respectively. Synchrotron X-ray diffraction and pair distribution function data confirm large structural similarity over long-range and at the atomic scale for these materials. However, they show distinct electrochemical properties and kinetic behaviour arising from the different anion environments and the consequent difference in cationic electrostatic repulsion. In comparison with Li2VO3 with an active V4+/5+ redox reaction, the material Li2VO2F with oxofluoro anions and the partial activity of V3+/5+ redox reaction favor higher theoretical capacity (460 mA h g(-1) vs. 230 mA h g(-1)), higher voltage (2.5 V vs. 2.2 V), lower polarization (0.1 V vs. 0.3 V) and faster Li+ chemical diffusion (similar to 10(-9) cm(2) s(-1) vs. similar to 10(-11) cm(2) s(-1)). This work not only provides insights into the understanding of anion chemistry, but also suggests the rational design of new mixed-anion battery materials. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 10 Feb 2016 09:30 |
| Letzte Änderung: | 10 Feb 2016 09:30 |
| PPN: | |
| Sponsoren: | A.G. would like to thank support from Russian Ministry of Education and Science (MK-3206.2014.2)., R.W. thanks the EU Fund, Estonian Research Council, TUT and KBFI (MTT68, SF0690034s09, B618 and PUT126). |
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