LEVASSEUR, Stéphane; MÉNÉTRIER, Michel; DELMAS, Claude

doi:10.1016/S0378-7753(02)00456-1

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

MÉNÉTRIER, Michel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DELMAS, Claude
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Ce document a été publié dans

Journal of Power Sources. 2002, vol. 112, n° 2, p. 419-427

Elsevier

Résumé en anglais

A detailed characterization of the structural modifications and redox processes occurring upon lithium deintercalation from the Lix0Co1−yMgyO2 materials (x0=1.0 and 1.10; y=0.0, 0.03, 0.05 and 0.06) was performed in order to determine the effect of Mg doping on the cycling properties. Using electrochemical tests, X-ray diffraction (XRD), 7Li MAS NMR and electrical properties measurements, we show that the LixCo1−yMgyO2 system exhibits a solid solution existing in the whole deintercalation range studied (0.30≤×≤1.0). These phases exhibit reversible capacities equivalent to that of LiCoO2 upon cycling with a good structural stability. Moreover, the 7Li MAS NMR study shows that the structural defects (O vacancies and intermediate spin Co3+ ions) which are present in the starting Mg-doped phases govern the electronic properties upon lithium deintercalation. Indeed, regardless of the presence of Mg ions in the structure, a behavior similar to that of the LixCoO2 (1< Réduire

Mots clés en anglais

LiCoO2

Layered oxide

NMR

Lithium battery

Electrical properties

Magnesium substitution

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On the LixCo1-yMgyO2 system upon deintercalation: electrochemical, electronic properties and 7Li MAS NMR studies

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