The structural conversion from α-AgVO3 to β-AgVO3: Ag nanoparticle decorated nanowires with application as cathode materials for Li-ion batteries

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dc.contributor.authorMcNulty, David
dc.contributor.authorRamasse, Quentin
dc.contributor.authorO'Dwyer, Colm
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEngineering and Physical Sciences Research Council, United Kingdomen
dc.date.accessioned2016-10-07T10:43:34Z
dc.date.available2016-10-07T10:43:34Z
dc.date.issued2016-08-19
dc.description.abstractThe majority of electrode materials in batteries and related electrochemical energy storage devices are fashioned into slurries via the addition of a conductive additive and a binder. However, aggregation of smaller diameter nanoparticles in current generation electrode compositions can result in non-homogeneous active materials. Inconsistent slurry formulation may lead to inconsistent electrical conductivity throughout the material, local variations in electrochemical response, and the overall cell performance. Here we demonstrate the hydrothermal preparation of Ag nanoparticle (NP) decorated α-AgVO3 nanowires (NWs) and their conversion to tunnel structured β-AgVO3 NWs by annealing to form a uniform blend of intercalation materials that are well connected electrically. The synthesis of nanostructures with chemically bound conductive nanoparticles is an elegant means to overcome the intrinsic issues associated with electrode slurry production, as wire-to-wire conductive pathways are formed within the overall electrode active mass of NWs. The conversion from α-AgVO3 to β-AgVO3 is explained in detail through a comprehensive structural characterization. Meticulous EELS analysis of β-AgVO3 NWs offers insight into the true β-AgVO3 structure and how the annealing process facilitates a higher surface coverage of Ag NPs directly from ionic Ag content within the α-AgVO3 NWs. Variations in vanadium oxidation state across the surface of the nanowires indicate that the β-AgVO3 NWs have a core–shell oxidation state structure, and that the vanadium oxidation state under the Ag NP confirms a chemically bound NP from reduction of diffused ionic silver from the α-AgVO3 NWs core material. Electrochemical comparison of α-AgVO3 and β-AgVO3 NWs confirms that β-AgVO3 offers improved electrochemical performance. An ex situ structural characterization of β-AgVO3 NWs after the first galvanostatic discharge and charge offers new insight into the Li+ reaction mechanism for β-AgVO3. Ag+ between the van der Waals layers of the vanadium oxide is reduced during discharge and deposited as metallic Ag, the vacant sites are then occupied by Li+.en
dc.description.sponsorshipScience Foundation Ireland ((SFI Technology Innovation and Development Award under contract no. 13/TIDA/E2761), (Grant Number 14/IA/2581)); Engineering and Physical Sciences Research Council, EPSRC, United Kingdom (SuperSTEM Laboratory is the U.K. National Facility for Aberration Corrected STEM)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMcNulty, D., Ramasse, Q. and O'Dwyer, C. (2016) ‘The structural conversion from α-AgVO3 to β-AgVO3: Ag nanoparticle decorated nanowires with application as cathode materials for Li-ion batteries,’ Nanoscale, 8, pp. 16266-16275. doi: 10.1039/C6NR04825Ken
dc.identifier.doi10.1039/c6nr04825k
dc.identifier.endpage16275en
dc.identifier.issn2040-3364
dc.identifier.journaltitleNanoscaleen
dc.identifier.startpage16266en
dc.identifier.urihttps://hdl.handle.net/10468/3167
dc.identifier.volume8en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.rights© The Royal Society of Chemistry 2016en
dc.subjectSilveren
dc.subjectConductive nanoparticlesen
dc.subjectElectrical conductivityen
dc.subjectElectrochemical energy storage devicesen
dc.subjectStructural characterizationen
dc.subjectHydrothermal preparationen
dc.subjectElectrochemical performanceen
dc.subjectElectrochemical responseen
dc.subjectGalvanostatic dischargeen
dc.subjectNanowiresen
dc.subjectNanostructuresen
dc.subjectNanoparticlesen
dc.subjectLithium-ion batteriesen
dc.subjectMetal nanoparticlesen
dc.subjectMetallic compoundsen
dc.titleThe structural conversion from α-AgVO3 to β-AgVO3: Ag nanoparticle decorated nanowires with application as cathode materials for Li-ion batteriesen
dc.typeArticle (peer-reviewed)en
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