Formation and characterisation of ordered porous vanadium oxide inverse opal materials for Li-ion batteries

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dc.contributor.advisor O'Dwyer, Colm en Armstrong, Eileen 2015-11-10T12:04:13Z 2015-11-10T12:04:13Z 2015 2015
dc.identifier.citation Armstrong, E. 2015. Formation and characterisation of ordered porous vanadium oxide inverse opal materials for Li-ion batteries. PhD Thesis, University College Cork. en
dc.description.abstract This thesis presents several routes towards achieving artificial opal templates by colloidal self-assembly of polystyrene (PS) or poly(methyl methacrylate) (PMMA) spheres and the use of these template for the fabrication of V2O5 inverse opals as cathode materials for lithium ion battery applications. First, through the manipulation of different experimental factors, several methods of affecting or directing opal growth towards realizing different structures, improving order and/or achieving faster formation on a variety of substrates are presented. The addition of the surfactant sodium dodecyl sulphate (SDS) at a concentration above the critical micelle concentration for SDS to a 5 wt% solution of PMMA spheres before dip-coating is presented as a method of achieving ordered 2D PhC monolayers on hydrophobic Au-coated silicon substrates at fast and slow rates of withdrawal. The effect that the degree of hydrophilicity of glass substrates has on the ordering of PMMA spheres is next investigated for a slow rate of withdrawal under noise agitation. Heating of the colloidal solution is also presented as a means of affecting order and thickness of opal deposits formed using fast rate dip coating. E-beam patterned substrates are shown as a means of altering the thermodynamically favoured FCC ordering of polystyrene spheres (PS) when dip coated at slow rate. Facile routes toward the synthesis of ordered V2O5 inverse opals are presented with direct infiltration of polymer sphere templates using liquid precursor. The use of different opal templates, both 2D and 3D partially ordered templates, is compared and the composition and arrangement of the subsequent IO structures post infiltration and calcination for various procedures is characterised. V2O5 IOs are also synthesised by electrodeposition from an aqueous VOSO4 solution at constant voltage. Electrochemical characterisation of these structures as cathode material for Li-ion batteries is assessed in a half cell arrangement for samples deposited on stainless steel foil substrates. Improved rate capabilities are demonstrated for these materials over bulk V2O5, with the improvement attributed to the shorter Li ion diffusion distances and increased electrolyte infiltration provided by the IO structure. en
dc.description.sponsorship Irish Research Council for Science Engineering and Technology (RS/2010/2920) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2015, Eileen Armstrong. en
dc.rights.uri en
dc.subject Artificial opals en
dc.subject Photonic crystals en
dc.subject Inverse opals en
dc.subject Colloidal crystals en
dc.subject Vanadium oxide en
dc.subject Lithium ion batteries en
dc.title Formation and characterisation of ordered porous vanadium oxide inverse opal materials for Li-ion batteries en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Irish Research Council for Science Engineering and Technology en
dc.description.status Not peer reviewed en Chemistry en Tyndall National Institute
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out No en
dc.thesis.opt-out false
dc.check.embargoformat Not applicable en
dc.internal.conferring Summer Conferring 2015

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© 2015, Eileen Armstrong. Except where otherwise noted, this item's license is described as © 2015, Eileen Armstrong.
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