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dc.contributor.authorLiu, Aaron
dc.date.accessioned2017-07-17T16:37:12Z
dc.date.available2017-07-17T16:37:12Z
dc.identifier.urihttp://hdl.handle.net/10222/73037
dc.description.abstractLiCo1-2xMgxMnxO2 (0 ≤ x ≤ 0.05) positive electrode materials were prepared from Co1-2xMgxMnx(OH)2 (0 ≤ x ≤ 0.05) co-precipitated precursor materials by mixing precursor materials with Li2CO3 and heating. All precursor and lithiated materials were characterized by Scanning Electron Microscopy, X-ray Diffraction (XRD), Inductively Coupled Plasma – Optical Emissions Spectroscopy, in situ XRD, and electrochemical testing. Increasing Mg/Mn content in the material was found to slightly increase the 1st charge capacity, decrease the 1st discharge capacity, and increase the 1st cycle irreversible capacity when cycling up to 4.7 V, likely due to oxygen loss at high voltage. Cells with even 1% Mg/Mn doping were shown to have markedly improved cycling performance, but cells with higher Mg/Mn content did not further improve cycling performance. Results suggest that the cycling improvements stem from suppressing the cell resistance growth and not from the suppression of the O3-O6-O1 phase transitions at high voltage.en_US
dc.language.isoenen_US
dc.subjectElectrochemistryen_US
dc.subjectMaterialsen_US
dc.subjectLithium ion batteriesen_US
dc.subjectPositive electrode materialsen_US
dc.subjectLCOen_US
dc.subjectHigh voltageen_US
dc.titleSynthesis and Characterization of Magnesium and Manganese Doped LiCoO2en_US
dc.date.defence2017-07-05
dc.contributor.departmentDepartment of Chemistryen_US
dc.contributor.degreeMaster of Scienceen_US
dc.contributor.external-examinern/aen_US
dc.contributor.graduate-coordinatorMark Stradiottoen_US
dc.contributor.thesis-readerMark Obrovacen_US
dc.contributor.thesis-readerPeng Zhangen_US
dc.contributor.thesis-supervisorJeff Dahnen_US
dc.contributor.ethics-approvalNot Applicableen_US
dc.contributor.manuscriptsNot Applicableen_US
dc.contributor.copyright-releaseNot Applicableen_US
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