Coupled Ion/Electron Hopping in LixNiO2: A 7Li NMR Study
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CHAZEL, Cédric | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | MÉNÉTRIER, Michel | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CROGUENNEC, Laurence | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DELMAS, Claude | |
| dc.date.issued | 2006 | |
| dc.identifier.issn | 0020-1669 | |
| dc.description.abstractEn | Deintercalated "LixNiO2" materials (x = 0.25, 0.33, 0.50, 0.58, and 0.65) were obtained using the electrochemical route from the Li0.985Ni1.015O2 and Li0.993Ni1.007O2 compounds. Refinements of X-ray diffraction data using the Rietveld method show a good agreement with the phase diagram of the LixNiO2 system studied earlier in this laboratory. Electronic conductivity measurements show a thermally activated electron-hopping process for the deintercalated Li0.5NiO2 phase. In the LixNiO2 materials investigated (x = 0.25, 0.33, 0.50, and 0.58), 7Li NMR shows mobility effects leading to an exchanged signal at room temperature. A clear tendency for Li to be surrounded mainly by Ni3+ ions with the 180 configuration is observed, particularly, for strongly deintercalated materials with smaller Li+ and Ni3+ contents, even upon heating, when this mobility becomes very fast in the NMR time scale. This suggests that Li/vacancy hopping does occur on the NMR time scale but that Ni3+/Ni4+ hopping does not occur independently. The position of Li seems to govern the oxidation state of the Ni around it at any time; the electrons follow the Li ions to satisfy local electroneutrality and minimal energy configuration. The observed NMR shifts are compatible with the Li/vacancy and Ni3+/Ni4+ ordering patterns calculated by Arroyo y de Dompablo et al. for x = 0.25 and x = 0.50, but not for x = 0.33 and x = 0.58. | |
| dc.language.iso | en | |
| dc.publisher | American Chemical Society | |
| dc.subject.en | Ion | |
| dc.subject.en | Electron | |
| dc.subject.en | Lithium batteries | |
| dc.subject.en | Nuclear magnetic resonance | |
| dc.subject.en | 7Li | |
| dc.title.en | Coupled Ion/Electron Hopping in LixNiO2: A 7Li NMR Study | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1021/ic051593n | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Inorganic Chemistry | |
| bordeaux.page | p. 1184-1191 | |
| bordeaux.volume | vol. 45, n° 3 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00080028 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Non spécifiée | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00080028v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Inorganic%20Chemistry&rft.date=2006&rft.volume=vol.%2045,%20n%C2%B0%203&rft.spage=p.%201184-1191&rft.epage=p.%201184-1191&rft.eissn=0020-1669&rft.issn=0020-1669&rft.au=CHAZEL,%20C%C3%A9dric&M%C3%89N%C3%89TRIER,%20Michel&CROGUENNEC,%20Laurence&DELMAS,%20Claude&rft.genre=article |
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