CobaltMaghrebV1, France, Analysis, bibRecord, 000261

On the metastable O2-type LiCoO2

Identifieur interne : 000261 ( France/Analysis ); précédent : 000260; suivant : 000262

On the metastable O2-type LiCoO2

Auteurs : D. Carlier [France] ; I. Saadoune [France] ; L. Croguennec [France] ; M. Ménétrier [France] ; E. Suard [France] ; C. Delmas [France]

Source :

Solid State Ionics [ 0167-2738 ] ; 2001.

RBID : ISTEX:309C387EA12B64F1D046DDE4565AFADDD4D5EA98

Descripteurs français

Pascal (Inist)
- 6166F, 7660, Affinement, Angle magique, Co Li O, Cobalt oxyde, Composé ternaire, Cristal lamellaire, Diffraction neutron, Désinsertion, Echange ion, Etude expérimentale, LiCoO2, Lithium oxyde, Microscopie électronique balayage, Microstructure, Mode empilement, Phase métastable, Propriété électrochimique, RMN, Stoechiométrie, Structure cristalline, Traitement thermique.

English descriptors

KwdEn :
- Cobalt oxides, Crystal structure, Desinsertion, Electrochemical properties, Experimental study, Heat treatments, Ion exchange, Layered crystals, Lithium oxides, Magic angle, Metastable phases, Microstructure, NMR, Neutron diffraction, Refinement, Scanning electron microscopy, Stacking sequence, Stoichiometry, Ternary compounds.

Abstract

The exchange of sodium for lithium in P2-Na0.70CoO2 leads to an unusual O2-LiCoO2 variety. Rietveld refinement of the neutron diffraction pattern of the O2-LiCoO2 phase confirms the stoichiometry and the structural parameters previously reported and shows that the strong Li+–Co3+ electrostatic repulsion occurring through the common face of the CoO6 and LiO6 octahedra leads to small displacements of the lithium and cobalt ions from the center of their octahedra. Magnetic measurements and 7Li MAS NMR confirm a composition very close to the ideal one for the O2 phase. The O2-LiCoO2 phase is metastable and transforms to well-crystallized O3-LiCoO2 upon heating. Even at intermediate temperatures, the formation of LT-LiCoO2 phase is never observed. Various morphologies are obtained for the O3-LiCoO2 phases, depending on the thermal treatment used. A preliminary electrochemical study shows that almost all the lithium ions can be reversibly deintercalated from the O2-LiCoO2 phase.

Url:

https://api.istex.fr/document/309C387EA12B64F1D046DDE4565AFADDD4D5EA98/fulltext/pdf

DOI: 10.1016/S0167-2738(01)00982-1

Affiliations:

Links to Exploration step

ISTEX:309C387EA12B64F1D046DDE4565AFADDD4D5EA98

Le document en format XML

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<front><div type="abstract" xml:lang="en">The exchange of sodium for lithium in P2-Na0.70CoO2 leads to an unusual O2-LiCoO2 variety. Rietveld refinement of the neutron diffraction pattern of the O2-LiCoO2 phase confirms the stoichiometry and the structural parameters previously reported and shows that the strong Li+–Co3+ electrostatic repulsion occurring through the common face of the CoO6 and LiO6 octahedra leads to small displacements of the lithium and cobalt ions from the center of their octahedra. Magnetic measurements and 7Li MAS NMR confirm a composition very close to the ideal one for the O2 phase. The O2-LiCoO2 phase is metastable and transforms to well-crystallized O3-LiCoO2 upon heating. Even at intermediate temperatures, the formation of LT-LiCoO2 phase is never observed. Various morphologies are obtained for the O3-LiCoO2 phases, depending on the thermal treatment used. A preliminary electrochemical study shows that almost all the lithium ions can be reversibly deintercalated from the O2-LiCoO2 phase.</div>
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Serveur d'exploration sur le cobalt au Maghreb

On the metastable O2-type LiCoO2

On the metastable O2-type LiCoO2

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

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