[en] In order to favor electronic conductivity in sodium iron fluorophosphate electrodes for lithium- or sodium-ion batteries, composites of Na2FePO4F with multi-walled carbon nanotubes (CNTs) were prepared by pilot-scale spray drying. Addition of multi-walled CNTs in the solution results in an excellent dispersion of the CNTs within the volume of Na2FePO4F and not only at the surface of the particles. Following a heat treatment at 600°C in argon in order to reach crystallization, X-ray diffraction and ex situ Mössbauer spectroscopy revealed the presence of significant amounts of Fe(III) and maghemite (γ-Fe2O3) in the powder. However, Na2FePO4F/CNTs composites exhibit good electrochemical performance when cycling against lithium, with a discharge capacity of 104mAhg-1 at C/10 rate and 90mAhg-1 at 1C rate. Therefore, operando 57Fe transmission Mössbauer spectroscopy analyses were carried out in order to investigate the evolution of the iron oxidation state during cycling. During the first discharge, all the Fe(III) is reduced to Fe(II), explaining the good electrochemical performance.
Disciplines :
Chemistry
Author, co-author :
Brisbois, Magali; Université de Liège - ULiège > Greenmat
Caes, Sébastien ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Sougrati, M.T.; Université Montpellier 2 > Institut Charles Gerhardt
Vertruyen, Bénédicte ; Université de Liège > Département de chimie (sciences) > Chimie inorganique structurale
Schrijnemakers, Audrey ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Cloots, Rudi ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Eshraghi, Nicolas ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Hermann, Raphaël ; Université de Liège > Département de chimie (sciences) > Département de chimie (sciences)
Mahmoud, Abdelfattah ; Université de Liège > Département de chimie (sciences) > LCIS - GreenMAT
Na2FePO4F/multi-walled carbon nanotubes for lithium-ion batteries: Operando Mössbauer study of spray-dried composites
Publication date :
2016
Journal title :
Solar Energy Materials and Solar Cells
ISSN :
0927-0248
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
148
Pages :
67
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE] DGTRE - Région wallonne. Direction générale des Technologies, de la Recherche et de l'Énergie [BE] Forschungszentrum Jülich
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