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Development of a water based process for stable conversion cathodes on the basis of FeF3

Pohl, Alexander and Faraz, Mohammadkazem and Schröder, Andreas and Baunach, Michael and Schabel, Wilhelm and Guda, Alexander and Shapovalov, Viktor and Soldatov, Alexander and Chakravadhanula, Venkata Sai Kiran and Kübel, Christian and Witte, Ralf and Hahn, Horst and Diemant, Thomas and Behm, R. Jürgen and Emerich, Hermann and Fichtner, Maximilian (2016):
Development of a water based process for stable conversion cathodes on the basis of FeF3.
In: Journal of Power Sources, Elsevier Science BV, Netherlands, pp. 213-222, 313, ISSN 03787753,
[Online-Edition: https://doi.org/10.1016/j.jpowsour.2016.02.080],
[Article]

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.

Item Type: Article
Erschienen: 2016
Creators: Pohl, Alexander and Faraz, Mohammadkazem and Schröder, Andreas and Baunach, Michael and Schabel, Wilhelm and Guda, Alexander and Shapovalov, Viktor and Soldatov, Alexander and Chakravadhanula, Venkata Sai Kiran and Kübel, Christian and Witte, Ralf and Hahn, Horst and Diemant, Thomas and Behm, R. Jürgen and Emerich, Hermann and Fichtner, Maximilian
Title: Development of a water based process for stable conversion cathodes on the basis of FeF3
Language: English
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.

Journal or Publication Title: Journal of Power Sources
Volume: 313
Publisher: Elsevier Science BV, Netherlands
Uncontrolled Keywords: Iron Fluoride, Reduced graphene oxide, Conversion material, Lithium battery, Principle component Analysis, Mossbauer spectroscopy
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 Jul 2017 09:26
Official URL: https://doi.org/10.1016/j.jpowsour.2016.02.080
Identification Number: doi:10.1016/j.jpowsour.2016.02.080
Funders: 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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