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An X-ray photoelectron spectroscopy study of the electrochemical behaviour of iron molybdate thin films in lithium and sodium cells

Publié le 29 mars 2018
An X-ray photoelectron spectroscopy study of the electrochemical behaviour of iron molybdate thin films in lithium and sodium cells
Auteurs
Grissa R., Martinez H., Pelé V., Cotte S., Pecquenard B., Le Cras F.
Year2017-0007
Source-TitleJournal of Power Sources
Affiliations
IPREM ECP – UMR CNRS 5254, Université de Pau et des Pays de l'Adour, Hélioparc Pau-Pyrénées, 2 Avenue du Président Angot, Cedex 9, Pau, France, CNRS, Université de Bordeaux, ICMCB–UPR 9048 and Bordeaux INP, 87 Avenue du Dr. SchweitzerPessac, France, CEA LETI, 17 rue des Martyrs, Grenoble, France, Université Grenoble Alpes, Grenoble, France
Abstract
Iron molybdate thin films are studied here as a possible electrode material for future Li and Na microbatteries working in a lower potential range than currently used systems. Monoclinic Fe2(MoO4)3thin films are successfully deposited using radio frequency (RF) sputtering and an annealing treatment. The electrochemical behaviour of the obtained electrodes against Li and Na is then studied in a coin cell configuration with liquid electrolytes. The redox processes ruling the insertion/deinsertion of Li+and Na+are investigated by means of XPS (X-ray Photoelectron Spectroscopy). The results highlight a different behaviour depending on the alkali, with a better redox reversibility for sodium at the end of the first charge. For subsequent cycles however, improved capacity retention is evidenced for cycling versus lithium as compared to sodium which was attributed to the properties of the SEI layer. © 2017 Elsevier B.V.
Author-Keywords
Batteries, Fe2(MoO4)3, Lithium, Sodium, Thin films, XPS
Index-Keywords
Electrochemical corrosion, Electrochemical electrodes, Electrodes, Lithium, Lithium compounds, Photoelectrons, Photons, Sodium, Solar cells, Thin films, Annealing treatments, Capacity retention, Electrochemical behaviour, Electrode material, Iron molybdates, Liquid electrolytes, Radio-frequency sputtering, X-ray photoelectron spectroscopy studies, X ray photoelectron spectroscopy
ISSN3787753
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