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Contribution à l'étude électrochimique du système P2-NaxCoO2 : synthèse et caractérisation de nouveaux oxydes lamellaires ordonnés (A/A')CoO2 (A, A' = Li, Na, Ag)

Abstract : The P2-NaxCoO system exhibits various outstanding physical phenomena such as promising thermoelectric properties (for x ~ 0.7) and superconductivity for hydrated compositions. The first part of the present study uses electrochemistry through sodium batteries to deeply explore the P2-NaxCoO2 phase diagram (for x ≥ 0.5) in a continuous way, with especially an in situ XRD experiment that follows sodium ions intercalation. Peculiar single-phase compositions are characterized by a specific electrochemical voltage, and their relative thermal stability is studied through electrochemical cycling at various temperatures.The second part of this project deals with the ordered OP4-(Li/Na)CoO2 system which also exhibits promising thermoelectric features. Its structure is characterized by an alternate intercalation of lithium and sodium ions. Using this system, topotactic ionic exchanges enable to obtain three new stackings, O4-LiCoO2, D4-AgCoO2, and the OD4-(Li/Ag)CoO2 which are first simulated, experimentally evidenced and then characterized. The OD4 stacking is thefirst example of a NaCl / delafossite intergrowth in the same layered structure.
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Submitted on : Monday, February 14, 2011 - 4:56:52 PM
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Romain Berthelot. Contribution à l'étude électrochimique du système P2-NaxCoO2 : synthèse et caractérisation de nouveaux oxydes lamellaires ordonnés (A/A')CoO2 (A, A' = Li, Na, Ag). Matériaux. Université Sciences et Technologies - Bordeaux I, 2010. Français. ⟨tel-00565834⟩

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