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Promising nanometric spinel cobalt oxides for electrochemical energy storage : investigation of Li and H environments by NMR

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGODILLOT, Gérôme
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorHUO, Hua
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMÉNÉTRIER, Michel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorBOURGEOIS, Lydie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUERLOU-DEMOURGUES, Liliane
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
dc.date.issued2012
dc.identifier.issn1932-7447
dc.description.abstractEnSpinel-type cobalt oxides with formula HxLiyCo3−δO4 exhibit interesting properties for various electrochemical energy storage applications thanks to their attractive electronic properties, due to the presence of H and Li ions in their structure as well as their nanometric dimensions. The effect of temperature on the H and Li environments is studied by investigating materials heat-treated at temperatures ranging from 25 to 650 °C by means of NMR spectroscopy. Two types of proton are evidenced: one bonded to oxygen atoms belonging to the network (hydroxyl group) and the other one involved in the H2O molecule. This configuration is in agreement with IR spectroscopy measurements, revealing the absence of free −OH groups, which mean that protons in the structure are involved in hydrogen bonds. After heat treatments at increasing temperature, NMR confirms that hydrogen is released, which induces first the migration of Li ions beyond 200 °C (probably from the 8a to the 16c sites), followed by a progressive reorganization of the structure with formation of HT-LiCoO2 beyond 400 °C.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enPromising nanometric spinel cobalt oxides for electrochemical energy storage : investigation of Li and H environments by NMR
dc.typeArticle de revue
dc.identifier.doi10.1021/jp307458z
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Physical Chemistry C
bordeaux.page26598-26607
bordeaux.volume116
bordeaux.issue50
bordeaux.peerReviewedoui
hal.identifierhal-00804974
hal.version1
hal.popularnon
hal.audienceInternationale
dc.subject.esCobalt oxides
dc.subject.esSpinel
dc.subject.esNanoparticles
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00804974v1
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