COTTE, Stéphane; PELÉ, Vincent; PECQUENARD, Brigitte; LE CRAS, Frédéric; GRISSA, Rabeb; BOURGEOIS, Lydie; SOUGRATI, Moulay Tahar; MARTINEZ, Hervé

doi:10.1016/j.jallcom.2017.11.231

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COTTE, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PELÉ, Vincent
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

PECQUENARD, Brigitte
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Alloys and Compounds. 2018-02, vol. 735, p. 1454-1462

Elsevier

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With the aim of developing 3V all-solid-state lithium microbatteries, Fe$_2$(MoO$_4)_3$ thin films were prepared by radiofrequency magnetron sputtering from a home-madeFe$_2$(MoO$_4)_3$ target using optimized sputtering conditions. In addition to elemental analyses, Mössbauer spectroscopy and XPS analyses, showing that Mo$^{6+}$ and Fe$^{3+}$ 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 Fe$_2$(MoO$_4)_3$ formula unit. The corresponding voltage curve displays a plateau with a low hysteresis located at 3.0 V/Li$^+$/Li and related to the Fe$_2$(MoO$_4)_3$ – Li$_2$Fe$_2$(MoO$_4)_3$ 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.< Réduire

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Lithium

Sputtering

Iron molybdate

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

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