Pohl, Alexander ; Faraz, Mohammadkazem ; Schröder, Andreas ; Baunach, Michael ; Schabel, Wilhelm ; Guda, Alexander ; Shapovalov, Viktor ; Soldatov, Alexander ; Chakravadhanula, Venkata Sai Kiran ; Kübel, Christian ; Witte, Ralf ; Hahn, Horst ; Diemant, Thomas ; Behm, R. Jürgen ; Emerich, Hermann ; Fichtner, Maximilian (2016)
Development of a water based process for stable conversion cathodes on the basis of FeF3.
In: Journal of Power Sources, 313
doi: 10.1016/j.jpowsour.2016.02.080
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A facile water based synthesis method for HTB-FeF3/rGO and r-FeF3/rGO composites was developed using FeF3 nanoparticles prepared by ball-milling and aqueous graphene oxide precursor. Electrodes of HTB-FeF3/rGO were cast in ambient air and the calendered electrode shows a stable specific energy of 470 Wh kg(-1) (210 mA h g(-1), 12 mA g(-1)) after 100 cycles in the range 1.3-4.3 V with very little capacity fading. The good cycle stability is attributed to the intimate contact of FeF3 nanoparticles with reduced graphene oxide carbon surrounding. Using a combination of in situ XRD, XAS and ex situ Mossbauer spectroscopy, we show that during discharge of HTB-FeF3/rGO composite Li is intercalated fast into the tunnels of the HTB-FeF3 structure up to x = 0.92 Li. The Li intercalation is followed by slow conversion of HTB-LixFeF3 to LiF and Fe nanoparticles below 2.0 V. During charge, the LiF and Fe phases are slowly transformed to amorphous FeF2 and FeF3 phases without reformation of the HTB-FeF3 framework structure. At an elevated temperature of 55 degrees C a much higher specific energy of 780 Wh kg(-1) was obtained. (c) 2016 Elsevier B.V. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Pohl, Alexander ; Faraz, Mohammadkazem ; Schröder, Andreas ; Baunach, Michael ; Schabel, Wilhelm ; Guda, Alexander ; Shapovalov, Viktor ; Soldatov, Alexander ; Chakravadhanula, Venkata Sai Kiran ; Kübel, Christian ; Witte, Ralf ; Hahn, Horst ; Diemant, Thomas ; Behm, R. Jürgen ; Emerich, Hermann ; Fichtner, Maximilian |
| Art des Eintrags: | Bibliographie |
| Titel: | Development of a water based process for stable conversion cathodes on the basis of FeF3 |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Mai 2016 |
| Verlag: | Elsevier Science BV, Netherlands |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Power Sources |
| Jahrgang/Volume einer Zeitschrift: | 313 |
| DOI: | 10.1016/j.jpowsour.2016.02.080 |
| Kurzbeschreibung (Abstract): | A facile water based synthesis method for HTB-FeF3/rGO and r-FeF3/rGO composites was developed using FeF3 nanoparticles prepared by ball-milling and aqueous graphene oxide precursor. Electrodes of HTB-FeF3/rGO were cast in ambient air and the calendered electrode shows a stable specific energy of 470 Wh kg(-1) (210 mA h g(-1), 12 mA g(-1)) after 100 cycles in the range 1.3-4.3 V with very little capacity fading. The good cycle stability is attributed to the intimate contact of FeF3 nanoparticles with reduced graphene oxide carbon surrounding. Using a combination of in situ XRD, XAS and ex situ Mossbauer spectroscopy, we show that during discharge of HTB-FeF3/rGO composite Li is intercalated fast into the tunnels of the HTB-FeF3 structure up to x = 0.92 Li. The Li intercalation is followed by slow conversion of HTB-LixFeF3 to LiF and Fe nanoparticles below 2.0 V. During charge, the LiF and Fe phases are slowly transformed to amorphous FeF2 and FeF3 phases without reformation of the HTB-FeF3 framework structure. At an elevated temperature of 55 degrees C a much higher specific energy of 780 Wh kg(-1) was obtained. (c) 2016 Elsevier B.V. All rights reserved. |
| Freie Schlagworte: | Iron Fluoride, Reduced graphene oxide, Conversion material, Lithium battery, Principle component Analysis, Mossbauer spectroscopy |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 26 Jul 2017 09:26 |
| Letzte Änderung: | 26 Jul 2017 09:26 |
| PPN: | |
| Sponsoren: | A. G., A. S and V. S. thank the Ministry of Education and Science of Russia for the financial support (agreement no. 14.587.21.0002, identifier RFME-FI58714X0002)., The authors thank the European Synchrotron Radiation Facility (ESRF) for granting beam time for the in situ XAS/XRD experiment., Financial support by EU-RTD "Hi-C" (Novel in situ and in operando techniques for characterization of interfaces in electrochemical storage systems) in the 7th FP, grant agreement no. 608575, is gratefully acknowledged. |
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