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

JOURNAL OF POWER SOURCES

卷:313

Article

Pohl, Alexander¹  Faraz, Mohammadkazem¹  Schroeder, Andreas^1,2  Baunach, Michael²  Schabel, Wilhelm²  Guda, Alexander³  Shapovalov, Viktor³  Soldatov, Alexander³  Chakravadhanula, Venkata Sai Kiran^1,4,5,6  Kuebel, Christian^1,4,5  Witte, Ralf^1,6  Hahn, Horst^1,4,6  Diemant, Thomas⁷  Behm, R. Juergen^4,7  Emerich, Hermann⁸  Fichtner, Maximilian^1,4 

[1] Karlsruhe Inst Technol, Inst Nanotechnol, POB 3640, D-76021 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, Inst Thermal Proc Engn, Thin Film Technol, POB 3640, D-76021 Karlsruhe, Germany

[3] Southern Fed Univ, Int Res Ctr Smart Mat, Sorge 5, Rostov Na Donu 344090, Russia

[4] Karlsruhe Inst Technol, Helmholtz Inst Ulm, Helmholtzstr 11, D-89081 Ulm, Germany

[5] Karlsruhe Inst Technol, Karlsruhe Nano Micro Facil, POB 3640, Karlsruhe, Germany

[6] Tech Univ Darmstadt, KIT TUD Joint Lab Nanomat, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany

[7] Univ Ulm, Inst Surface Chem & Catalysis, Albert Einstein Allee 47, D-89081 Ulm, Germany

[8] European Synchrotron Radiat Facil, Swiss Norwegian Beamline, BP 220, F-38043 Grenoble, France

关键词: Iron fluoride;    Reduced graphene oxide;    Conversion material;    Lithium battery;    Principle component analysis;    Mossbauer spectroscopy;   

DOI  :  10.1016/j.jpowsour.2016.02.080

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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