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Contribution à la compréhension de la structure de Li2MnO3, de ses défauts et de phases dérivées

Abstract : In order to get a better understanding of the complex structural evolutions occurring in the layered oxides like Li1+x(Ni0.425Mn0.425Co0.15)O2 materials when they are used as positive electrodes in lithium batteries, the structure of Li2MnO3 has been studied in detail.
Obtained from several synthesis ways, annealed at various temperatures, this compound that can be considered as a model one regarding these complex materials has been the object of a crystallographic study where the use of electron microscopy was privileged. Two kinds of defects could be identified. From one part, the existence of stacking faults in the Li2MnO3 material has been proved and they have been visualized for the first time. Their consequences on X ray and electron diffraction patterns are explained allowing the unification of discrepancies existing in the bibliography. For other part, the study of the thermal stability of Li2MnO3 evidenced the appearance of spinel type defects when the annealing treatment is performed above 900°C. Finally the delithiation by acid leaching is studied and the lithium extraction mechanism is clarified. It is shown that this mechanism is the same whatever the particle size is.
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Adrien Boulineau. Contribution à la compréhension de la structure de Li2MnO3, de ses défauts et de phases dérivées. Matériaux. Université Sciences et Technologies - Bordeaux I, 2008. Français. ⟨tel-00378262⟩

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