On the metastable O2-type LiCoO2
Identifieur interne : 000C38 ( Main/Merge ); précédent : 000C37; suivant : 000C39On the metastable O2-type LiCoO2
Auteurs : D. Carlier [France] ; I. Saadoune [France, Maroc] ; L. Croguennec [France] ; M. Menetrier [France] ; E. Suard [France] ; C. Delmas [France]Source :
- Solid state ionics [ 0167-2738 ] ; 2001.
Descripteurs français
- Pascal (Inist)
- Structure cristalline, Phase métastable, Affinement, Diffraction neutron, Stoechiométrie, Angle magique, RMN, Traitement thermique, Microstructure, Echange ion, Microscopie électronique balayage, Mode empilement, Propriété électrochimique, Désinsertion, Cristal lamellaire, Lithium oxyde, Cobalt oxyde, Composé ternaire, Etude expérimentale, LiCoO2, Co Li O, 6166F, 7660.
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 02 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.
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Pascal:02-0021500Le document en format XML
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<series><title level="j" type="main">Solid state ionics</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt oxides</term>
<term>Crystal structure</term>
<term>Desinsertion</term>
<term>Electrochemical properties</term>
<term>Experimental study</term>
<term>Heat treatments</term>
<term>Ion exchange</term>
<term>Layered crystals</term>
<term>Lithium oxides</term>
<term>Magic angle</term>
<term>Metastable phases</term>
<term>Microstructure</term>
<term>NMR</term>
<term>Neutron diffraction</term>
<term>Refinement</term>
<term>Scanning electron microscopy</term>
<term>Stacking sequence</term>
<term>Stoichiometry</term>
<term>Ternary compounds</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Structure cristalline</term>
<term>Phase métastable</term>
<term>Affinement</term>
<term>Diffraction neutron</term>
<term>Stoechiométrie</term>
<term>Angle magique</term>
<term>RMN</term>
<term>Traitement thermique</term>
<term>Microstructure</term>
<term>Echange ion</term>
<term>Microscopie électronique balayage</term>
<term>Mode empilement</term>
<term>Propriété électrochimique</term>
<term>Désinsertion</term>
<term>Cristal lamellaire</term>
<term>Lithium oxyde</term>
<term>Cobalt oxyde</term>
<term>Composé ternaire</term>
<term>Etude expérimentale</term>
<term>LiCoO2</term>
<term>Co Li O</term>
<term>6166F</term>
<term>7660</term>
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<front><div type="abstract" xml:lang="en">The exchange of sodium for lithium in P2-Na<sub>0.70</sub>
CoO<sub>2</sub>
leads to an unusual O2-LiCoO<sub>2</sub>
variety. Rietveld refinement of the neutron diffraction pattern of the O2-LiCoO<sub>2</sub>
phase confirms the stoichiometry and the structural parameters previously reported and shows that the strong Li +-Co3<sup>-+</sup>
electrostatic repulsion occurring through the common face of the CoO<sub>6</sub>
and LiO<sub>6</sub>
octahedra leads to small displacements of the lithium and cobalt ions from the center of their octahedra. Magnetic measurements and <sup>7</sup>
Li MAS NMR confirm a composition very close to the ideal one for the 02 phase. The O2-LiCoO<sub>2</sub>
phase is metastable and transforms to well-crystallized O3-LiCoO<sub>2</sub>
upon heating. Even at intermediate temperatures, the formation of LT-LiCoO<sub>2</sub>
phase is never observed. Various morphologies are obtained for the O3-LiCoO<sub>2</sub>
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-LiCoO<sub>2</sub>
phase.</div>
</front>
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<tree><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="Carlier, D" sort="Carlier, D" uniqKey="Carlier D" first="D." last="Carlier">D. Carlier</name>
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<name sortKey="Croguennec, L" sort="Croguennec, L" uniqKey="Croguennec L" first="L." last="Croguennec">L. Croguennec</name>
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<name sortKey="Menetrier, M" sort="Menetrier, M" uniqKey="Menetrier M" first="M." last="Menetrier">M. Menetrier</name>
<name sortKey="Saadoune, I" sort="Saadoune, I" uniqKey="Saadoune I" first="I." last="Saadoune">I. Saadoune</name>
<name sortKey="Suard, E" sort="Suard, E" uniqKey="Suard E" first="E." last="Suard">E. Suard</name>
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<country name="Maroc"><noRegion><name sortKey="Saadoune, I" sort="Saadoune, I" uniqKey="Saadoune I" first="I." last="Saadoune">I. Saadoune</name>
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