Electrochemical investigation of the role of MnO2 nanorod catalysts in water containing and anhydrous electrolytes for Li-O2 battery applications

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dc.contributor.authorGeaney, Hugh
dc.contributor.authorO'Dwyer, Colm
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderIrish Research Councilen
dc.date.accessioned2018-05-10T10:46:40Z
dc.date.available2018-05-10T10:46:40Z
dc.date.issued2015-01-28
dc.date.updated2018-05-03T08:02:02Z
dc.description.abstractThe electrochemical behaviour of MnO2 nanorod and Super P carbon based Li-O2 battery cathodes in water-containing sulfolane and anhydrous DMSO electrolytes are shown to be linked to specific discharge product formation. During discharge, large layered spherical agglomerates of LiOH were characteristically formed on the MnO2 cathodes while smaller, toroidal, spherical Li2O2 particles and films were formed on the Super P cathodes. In an anhydrous DMSO based electrolyte the LiOH structures were also found on cathodes discharged in the anhydrous electrolyte, suggesting that MnO2 initiates electrochemical decomposition of the DMSO electrolyte to form LiOH via H2O reactions with Li2O2. The LiOH crystals are uniquely formed on MnO2, and segregated to this phase even in mixed oxide-carbon cathodes. In contrast, no Li2O2 toroids were noted on Super P cathodes discharged in the DMSO based electrolytes. Instead, the morphology varied from smaller sheets (at high discharge current) to much larger agglomerates (at low discharge currents). In mixed carbon-MnO2 nanorod cathodes, the use of PVDF initiates H2O formation that affects discharge products and an overall mechanism governing phase formation at MnO2 in sulfolane and anhydrous DMSO with and without PVDF binder is presented. This work highlights the importance of careful consideration of electrolyte-cathode material-discharge product interactions in the search for more stable Li-O2 systems.en
dc.description.sponsorshipIrish Research Council (IRC New Foundations Award)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGeaney, H. and O'Dwyer, C. (2015) 'Electrochemical investigation of the role of MnO2 nanorod catalysts in water containing and anhydrous electrolytes for Li-O2 battery applications', Physical Chemistry Chemical Physics, 17(10), pp. 6748-6759. doi: 10.1039/C4CP05785Fen
dc.identifier.doi10.1039/C4CP05785F
dc.identifier.endpage6759en
dc.identifier.issn1463-9076
dc.identifier.issued10en
dc.identifier.journaltitlePhysical Chemistry Chemical Physicsen
dc.identifier.startpage6748en
dc.identifier.urihttps://hdl.handle.net/10468/6057
dc.identifier.volume17en
dc.language.isoenen
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::NMP/314508/EU/STable high-capacity lithium-Air Batteries with Long cycle life for Electric cars/STABLEen
dc.relation.urihttp://pubs.rsc.org/en/content/articlelanding/2015/cp/c4cp05785f#!divAbstract
dc.rights© the Owner Societies 2015en
dc.subjectNanorodsen
dc.subjectNanorod cathodeen
dc.subjectLi-O2en
dc.subjectBattery cathodesen
dc.subjectLithium-air batteriesen
dc.subjectEther-based electrolytesen
dc.subjectLi-airen
dc.subjectOxygen batteryen
dc.subjectHigh-capacityen
dc.subjectDimethyl-sulfoxideen
dc.subjectEnergy storageen
dc.subjectCarbon Cathodesen
dc.titleElectrochemical investigation of the role of MnO2 nanorod catalysts in water containing and anhydrous electrolytes for Li-O2 battery applicationsen
dc.typeArticle (peer-reviewed)en
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