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Influence of Mn/Fe ratio on electrochemical and structural properties of P2-NaxMn1–yFeyO2 phases as positive electrode material for Na-Ion batteries

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMORTEMARD DE BOISSE, Benoit
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCARLIER, Dany
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIGNARD, Marie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUÉRIN, Elodie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDUTTINE, Mathieu
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorWATTIAUX, Alain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDELMAS, Claude
dc.date.issued2018
dc.identifier.issn0897-4756
dc.description.abstractEnThe comparative structural, Mössbauer, and electrochemical studies of the NaxMn2/3Fe1/3O2 and NaxMn1/2Fe1/2O2 systems show that the change in the Mn/Fe ratio has a significant influence on the overlap between the Mn3+/4+ and Fe3+/4+ redox couples. The P2-type structure is maintained in the 0.3 < x < 0.8 domain. For the highest intercalation amount, structural distortions occur due to the Jahn–Teller effect of the Mn3+ ions. The macroscopic distortion results from a competition between the opposite effects of Mn3+ and Fe3+: the isotropic character of Fe3+ tends to prevent the macroscopic distortion. For the lower sodium amounts, the instability of the interstitial trigonal prismatic space leads to the formation, by slab gliding, of a very disordered structure. Even if this structural transition is reversible, a strong capacity fading is observed if the cell is charged above 4 V verus Na/Na+.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enInfluence of Mn/Fe ratio on electrochemical and structural properties of P2-NaxMn1–yFeyO2 phases as positive electrode material for Na-Ion batteries
dc.typeArticle de revue
dc.identifier.doi10.1021/acs.chemmater.8b02953
dc.subject.halChimie/Matériaux
dc.subject.halChimie/Autre
bordeaux.journalChemistry of Materials
bordeaux.page7672-7681
bordeaux.volume30
bordeaux.issue21
bordeaux.peerReviewedoui
hal.identifierhal-01931465
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01931465v1
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