Moisture exposed layered oxide electrodes as Na-ion battery cathodes

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dc.contributor.authorHan, MHen_AU
dc.contributor.authorSharma, Nen_AU
dc.contributor.authorGonzalo, Een_AU
dc.contributor.authorPramudita, JCen_AU
dc.contributor.authorBrand, HEAen_AU
dc.contributor.authorLópez del Amo, JMen_AU
dc.contributor.authorRojo, Ten_AU
dc.date.accessioned2021-12-07T22:01:21Zen_AU
dc.date.available2021-12-07T22:01:21Zen_AU
dc.date.issued2016-11-09en_AU
dc.date.statistics2021-11-11en_AU
dc.description.abstractMn-rich layered oxides of P2 Na2/3Mn0.8Fe0.1Ti0.1O2 have been shown to exhibit a remarkably stable electrochemical performance even after exposure to moisture for extended periods of time. Here, a detailed investigation of the electrochemical performance of pristine, protonated, and hydrated electrodes is reported. Neutron powder diffraction and 23Na NMR are employed in order to correlate the overall electrochemical performance of each electrode with that of the as-synthesized crystal structure. The effects of proton and water (or OH) moieties on the Na+ layers are discussed based on the electrochemical performance of each phase. The complete structural evolution of the protonated and pristine P2 Na2/3Mn0.8Fe0.1Ti0.1O2 electrodes during charge/discharge is determined via in situ synchrotron X-ray diffraction. The protonated phase at the potential cut-offs (1.5-4.2 and 2-4 V) and the applied currents used shows a predominantly solid-solution reaction with little evidence of a secondary phase while the pristine phase shows the formation of secondary phases and typically better electrochemical capacities. Therefore, the formation of the secondary phase, in part, enhances capacity in this system. Thus moisture exposure (and subsequent treatment) of generally P2 electrodes can lead to significantly different structural evolution during charge/discharge reactions and hence observed capacities. © 2016 The Royal Society of Chemistry.en_AU
dc.description.sponsorshipThis work was financially supported by the LINABATT project from Ministerio de Economía Competitividad (ENE2013-44330-R). Neeraj Sharma would like to thank AINSE Ltd for providing support through the research fellowship scheme and the Australian Research Council through the DECRA funding scheme (project number DE160100237). Part of this research was undertaken on the high resolution powder neutron diffractometer at ANSTO, Australia and on the Powder Diffraction beamline at the Australian Synchrotron, Victoria, Australia.en_AU
dc.identifier.citationHan, M. H., Sharma, N., Gonzalo, E., Pramudita, J. C., Brand, H. E. A., López del Amo, J. M. & Rojo, T. (2016). Moisture exposed layered oxide electrodes as Na-ion battery cathodes. Journal of Materials Chemistry A, 4(48), 18963-18975. doi:10.1039/C6TA07950Den_AU
dc.identifier.issn2050-7488en_AU
dc.identifier.issue48en_AU
dc.identifier.journaltitleJournal of Materials Chemistry Aen_AU
dc.identifier.pagination18963-18975en_AU
dc.identifier.urihttps://doi.org/10.1039/C6TA07950Den_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12378en_AU
dc.identifier.volume4en_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectLayersen_AU
dc.subjectOxidesen_AU
dc.subjectElectrodesen_AU
dc.subjectCathodesen_AU
dc.subjectElectric batteriesen_AU
dc.subjectSodium ionsen_AU
dc.subjectX-ray diffractionen_AU
dc.titleMoisture exposed layered oxide electrodes as Na-ion battery cathodesen_AU
dc.typeJournal Articleen_AU
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