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

Show simple item record McNulty, David Ramasse, Quentin O'Dwyer, Colm 2016-10-07T10:43:34Z 2016-10-07T10:43:34Z 2016-08-19
dc.identifier.citation McNulty, 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/C6NR04825K en
dc.identifier.volume 8 en
dc.identifier.startpage 16266 en
dc.identifier.endpage 16275 en
dc.identifier.issn 2040-3364
dc.identifier.doi 10.1039/c6nr04825k
dc.description.abstract The 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.sponsorship Science 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Royal Society of Chemistry en
dc.rights © The Royal Society of Chemistry 2016 en
dc.subject Silver en
dc.subject Conductive nanoparticles en
dc.subject Electrical conductivity en
dc.subject Electrochemical energy storage devices en
dc.subject Structural characterization en
dc.subject Hydrothermal preparation en
dc.subject Electrochemical performance en
dc.subject Electrochemical response en
dc.subject Galvanostatic discharge en
dc.subject Nanowires en
dc.subject Nanostructures en
dc.subject Nanoparticles en
dc.subject Lithium-ion batteries en
dc.subject Metal nanoparticles en
dc.subject Metallic compounds en
dc.title The structural conversion from α-AgVO3 to β-AgVO3: Ag nanoparticle decorated nanowires with application as cathode materials for Li-ion batteries en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Colm O'Dwyer, Chemistry, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en 12 month embargo at publisher's request en 2017-08-19
dc.description.version Accepted Version en
dc.internal.rssid 364190496
dc.internal.rssid 364190496
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Engineering and Physical Sciences Research Council, United Kingdom en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Nanoscale en
dc.internal.copyrightchecked !!CORA!! en
dc.internal.IRISemailaddress en

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