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Etude de matériaux d'électrode positive dérivés de LiNiO2 pour batteries Lithium-ion. Compréhension du mécanisme de dégradation thermique des phases désintercalées

Abstract : Li(Ni,M)O2 (M= Al, Co/Al and Mn) materials used as positive electrode materials for Li-ion batteries have been synthetized by a coprecipitation method and then characterized by X-ray and neutron diffraction, magnetic measurements and galvanostatic tests. The thermal degradation mechanism of the Lix(Ni,M)O2 (M = Al, Co/Al et Mn, x = 0.50 et 0.30) deintercalated phases was studied by Thermal Gravimetric Analyses coupled with Mass Spectrometry. Correlation with in situ X-ray diffraction experiments was then achieved to determine the degradation mechanism and to explain the differences in thermal stability observed depending on the material composition. For all studied materials, the degradation occurs in two steps, corresponding to the transition between the initial α-NaFeO2 type phase and a “LiM2O4” pseudo-spinel phase, which evolves into a NiO type phase at higher temperature. Influence of the substituent nature was discussed.
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https://tel.archives-ouvertes.fr/tel-00367763
Contributor : Marianne Guilmard <>
Submitted on : Thursday, March 12, 2009 - 1:11:18 PM
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Marianne Guilmard. Etude de matériaux d'électrode positive dérivés de LiNiO2 pour batteries Lithium-ion. Compréhension du mécanisme de dégradation thermique des phases désintercalées. Matériaux. Université Sciences et Technologies - Bordeaux I, 2002. Français. ⟨tel-00367763⟩

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