Iron molybdate thin films prepared by sputtering and their electrochemical behavior in Li batteries

Abstract : With the aim of developing 3V all-solid-state lithium microbatteries, Fe2(MoO4)3 thin films were prepared by radiofrequency magnetron sputtering from a home-made Fe2(MoO4)3 target using optimized sputtering conditions. In addition to elemental analyses, Mössbauer spectroscopy and XPS analyses, showing that Mo6+ and Fe3+ are the main detected species, confirmed the stoichiometric character of the films. Post-deposition annealing was necessary to form well-crystallized thin films. The best electrochemical performance was obtained with those annealed at 500 °C which were able to deliver a stable reversible capacity close to the theoretical one, i.e. 2 Li+ per Fe2(MoO4)3 formula unit. The corresponding voltage curve displays a plateau with a low hysteresis located at 3.0 V/Li+/Li and related to the Fe2(MoO4)3 – Li2Fe2(MoO4)3 two-phase system. Therefore, it was demonstrated for the first time the possible use of Fe2(MoO4)3 thin films as positive electrodes for 3 V lithium microbatteries.
Type de document :
Article dans une revue
Journal of Alloys and Compounds, Elsevier, 2018, 735, pp.1454-1462. 〈10.1016/j.jallcom.2017.11.231〉
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https://hal.archives-ouvertes.fr/hal-01671425
Contributeur : Stéphane Toulin <>
Soumis le : vendredi 22 décembre 2017 - 11:31:45
Dernière modification le : jeudi 11 janvier 2018 - 06:28:13

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Stéphane Cotte, Vincent Pelé, Brigitte Pecquenard, Frédéric Le Cras, Rabeb Grissa, et al.. Iron molybdate thin films prepared by sputtering and their electrochemical behavior in Li batteries. Journal of Alloys and Compounds, Elsevier, 2018, 735, pp.1454-1462. 〈10.1016/j.jallcom.2017.11.231〉. 〈hal-01671425〉

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