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Raman and FTIR Spectroscopy investigations of carbon-coated LixFePO4 materials

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMACCARIO, Magalie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCROGUENNEC, Laurence
hal.structure.identifierChimie et Biologie des Membranes et des Nanoobjets [CBMN]
dc.contributor.authorDESBAT, Bernard
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorCOUZI, Michel
hal.structure.identifierLaboratoire Composants pour l?Energie
dc.contributor.authorLE CRAS, Frédéric
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorSERVANT, Laurent
dc.date.issued2008
dc.identifier.issn0013-4651
dc.description.abstractEnRaman and Fourier transform infrared (FTIR) spectroscopy investigations were performed on carbon-coated LiFePO4 materials differing by the temperature of their thermal treatments (575 and 800°C) and by their electrochemical performance, with that obtained at a higher temperature showing larger reversible capacity and better capacity retention at high rates. Raman spectra gave information on the carbon located at the surface of the LiFePO4 particles, which was shown for the two samples to be highly disordered with small in-plane correlation lengths (<3 nm). A UV Raman study has shown that these carbon coatings contain almost no sp3-type carbon hybridization. This study has also highlighted again that the sp3-type C/sp2-type C ratio cannot be determined straightforwardly from Raman spectra recorded with visible excitation (such as 632.8 nm), and thus that no direct correlation can be done between the Raman band intensity ratio ID/IG and the sp3-type C/sp2-type C ratio; a UV Raman study is necessary to get the true information on the sp3-type C contribution. The baseline and absolute intensity of the FTIR spectra were shown to be sensitive to changes in the electronic conductivity of the C-LiFePO4 samples. Furthermore, good crystallinity was maintained for LixFePO4 materials upon cycling, showing good reversibility of the lithium deintercalation/intercalation reaction.
dc.language.isoen
dc.publisherElectrochemical Society
dc.title.enRaman and FTIR Spectroscopy investigations of carbon-coated LixFePO4 materials
dc.typeArticle de revue
dc.identifier.doi10.1149/1.2977961
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of The Electrochemical Society
bordeaux.pageA879-A886
bordeaux.volume155
bordeaux.issue12
bordeaux.peerReviewedoui
hal.identifierhal-00338780
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00338780v1
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