The influence of carrier density and doping type on lithium insertion and extraction processes at silicon surfaces

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dc.contributor.authorMcSweeney, William
dc.contributor.authorLotty, Olan
dc.contributor.authorGlynn, Colm
dc.contributor.authorGeaney, Hugh
dc.contributor.authorHolmes, Justin D.
dc.contributor.authorO'Dwyer, Colm
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderIrish Research Councilen
dc.contributor.funderUniversity College Corken
dc.contributor.funderSeventh Framework Programmeen
dc.date.accessioned2018-05-15T14:44:04Z
dc.date.available2018-05-15T14:44:04Z
dc.date.issued2014-05-17
dc.date.updated2018-05-03T11:17:43Z
dc.description.abstractThe Li+ insertion and extraction characteristics at n-type and p-type Si(100) electrodes with different carrier density and doping type are investigated by cyclic voltammetry and constant current measurements. The insertion and extraction potentials are demonstrated to vary with cycling and the occurrence of an activation effect is shown in n-type electrodes where the charge capacity and voltammetric currents are found to be much higher than p-type electrodes. A rate-dependent redox process influenced by the surface region electronic density, which influences the magnitude of cyclic voltammetry current is found at Si(100) surface regions during Li insertion and extraction. At p-type Si(100) surface regions, a thin, uniform film forms at lower currents, while also showing a consistently high (>70%) Coulombic efficiency for Li extraction. The p-type Si(100) surface region does not undergo crack formation after deintercalation and the amorphization was demonstrated using transmission electron microscopy (TEM). X-ray photoelectron spectroscopy (XPS) and Raman scattering demonstrate that highly doped n-type Si(100) retains Li as a silicide and converts to an amorphous phase as a two-step phase conversion process. The findings show the succinct dependence of Li insertion and extraction processes for uniformly doped Si(100) single crystals and how the doping type and its effect on the semiconductor-solution interface dominate Li insertion and extraction, composition, crystallinity changes and charge capacity.en
dc.description.sponsorshipHigher Education Authority (INSPIRE programme, funded by the Irish Government’s Programme for Research in Third Level Institutions, Cycle 4, National Development Plan 2007-2013); Irish Research Council (Award No. RS/2011/797); University College Cork (UCC Strategic Research Fund);en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMcSweeney, W., Lotty, O., Glynn, C., Geaney, H., Holmes, J. D. and O'Dwyer, C. (2014) 'The influence of carrier density and doping type on lithium insertion and extraction processes at silicon surfaces', Electrochimica Acta, 135, pp. 356-367. doi: 10.1016/j.electacta.2014.05.035en
dc.identifier.doi10.1016/j.electacta.2014.05.035
dc.identifier.endpage367en
dc.identifier.issn0013-4686
dc.identifier.journaltitleElectrochimica Actaen
dc.identifier.startpage356en
dc.identifier.urihttps://hdl.handle.net/10468/6115
dc.identifier.volume135en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Stokes Professorship & Lectureship Programme/07/SK/B1232a/IE/Colm ODwyer/en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Short Term Travel Fellowship (STTF)/07/SK/B1232a - STTF 11/IE/Optical Probing of Phase Changes in Inverse opal Photonic Crystal Li-on Battery Electrodes/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://www.sciencedirect.com/science/article/pii/S0013468614010196
dc.rights© 2014 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectSiliconen
dc.subjectElectrochemistryen
dc.subjectLi-ion batteryen
dc.subjectIntercalationen
dc.subject~Chemistry - Journal Articles~en
dc.subject~Tyndall National Institute - Journal Articles~en
dc.titleThe influence of carrier density and doping type on lithium insertion and extraction processes at silicon surfacesen
dc.typeArticle (peer-reviewed)en
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