This title appears in the Scientific Report :
2016
Please use the identifier:
http://dx.doi.org/10.1016/j.solmat.2015.09.005 in citations.
Na$_{2}$FePO$_{4}$F/multi-walled carbon nanotubes for lithium-ion batteries: Operando Mössbauer study of spray-dried composites
Na$_{2}$FePO$_{4}$F/multi-walled carbon nanotubes for lithium-ion batteries: Operando Mössbauer study of spray-dried composites
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...
Saved in:
Personal Name(s): | Brisbois, Magali |
---|---|
Caes, Sébastien / Sougrati, Moulay T. / Vertruyen, Bénédicte / Schrijnemakers, Audrey / Cloots, Rudi / Eshraghi, Nicolas / Hermann, Raphael / Mahmoud, Abdelfattah / Boschini, Frédéric (Corresponding author) | |
Contributing Institute: |
Streumethoden; JCNS-2 JARA-FIT; JARA-FIT Streumethoden; PGI-4 |
Published in: | Solar energy materials & solar cells, 148 (2016) S. 67 - 72 |
Imprint: |
Amsterdam [u.a.]
NH, Elsevier
2016
|
DOI: |
10.1016/j.solmat.2015.09.005 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) Materials and Processes for Energy and Transport Technologies Quantum Condensed Matter: Magnetism, Superconductivity Controlling Collective States Controlling Collective States |
Publikationsportal JuSER |
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 104 mA h g−1 at C/10 rate and 90 mA h g−1 at 1C rate. Therefore, operando57Fe 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. |