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hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBEKAERT, Emilie
hal.structure.identifierDepartment of Mechanical Engineering [Singapore]
dc.contributor.authorBALAYA, Palani
hal.structure.identifierMax Planck Institute for Solid State Research
dc.contributor.authorMURUGAVEL, Sevi
hal.structure.identifierMax Planck Institute for Solid State Research
dc.contributor.authorMAIER, Joachim
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMÉNÉTRIER, Michel
dc.date.issued2009
dc.identifier.issn0897-4756
dc.description.abstractEnNanocrystalline RuO<sub>2</sub> was electrochemically lithiated using a <sup>6</sup>Li-enriched negative electrode, and selected samples at various states of lithiation-delithiation were characterized ex situ by <sup>6</sup>Li magic-angle spinning nuclear magnetic resonance (<sup>6</sup>Li MAS NMR). In the first plateau (up to one Li per RuO<sub>2</sub>), a signal with considerable shift and loss of intensity is observed, showing a strongly paramagnetic character for the LiRuO<sub>2</sub> phase. A signal due to solid electrolyte interphase (SEI) appears at 0 ppm on this first plateau, but significantly grows only on the subsequent conversion plateau (from 1 to 4 Li/RuO<sub>2</sub>). Li<sub>2</sub>O is detected only at the very end of the latter plateau. On further lithiation (4 to 5.5 Li/RuO<sub>2</sub>), the magnitude of the Li<sub>2</sub>O signal remains constant, and a new signal at 4 ppm appears, that we can assign to interfacial Li hypothesized earlier in this system. Upon subsequent delithiation, NMR shows that the interfacial Li first disappears, then Li<sub>2</sub>O also disappears, and the reconstructed Li-RuO<sub>2</sub> phase is clearly different from the one formed during the initial lithiation of RuO<sub>2</sub>. Besides, the SEI signal slightly changes but does not decrease in magnitude upon delithiation. NMR results are in satisfactory agreement with the characteristic features of the proposed “job-sharing” mechanism.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enElectrochemistry
dc.subject.enNMR
dc.subject.enStorage
dc.subject.enMechanism
dc.subject.enInorganic compound
dc.subject.enRuthenium
dc.title.en<sup>6</sup>Li MAS NMR investigation of electrochemical lithiation of RuO<sub>2</sub>: evidence for an interfacial storage mechanism
dc.typeArticle de revue
dc.identifier.doi10.1021/cm8028005
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry of Materials
bordeaux.page856-861
bordeaux.volume21
bordeaux.issue5
bordeaux.peerReviewedoui
hal.identifierhal-00385837
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00385837v1
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