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Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries
Dissertation (MEng)--University of Pretoria, 2017.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2018
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| _version_ | 1867613550824914944 |
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| access_status_str | Open Access |
| author2 | Crouse, Philippus L. |
| author_browse | Crouse, Philippus L. |
| author_facet | Crouse, Philippus L. |
| collection | Thesis |
| dc_rights_str_mv | © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2017. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/66580 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:56.361Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/66580 Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries Crouse, Philippus L. osemeikhianosi@yahoo.com Ogbeifun, Osemeikhian UCTD Fluorinated LiCoO2 Sol-gel fluorination Lithium oxydifluoride Solid-state fluorination Engineering, built environment and information technology theses SDG-07 Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-13 Dissertation (MEng)--University of Pretoria, 2017. A series of fluorinated LiCoO2 compounds, LiCoO2−xFx with x = 0.05 − 0.65, were synthesised by both a sol-gel and a solid-state method. The sol-gel method utilises LiNO3 and Co(NO3)2.6H2O as Li and Co sources respectively, water and 1-butanol as solvent for the fluoride precursor LiF, and citric acid as the chelating agent. The prepared materials were compared using pXRD, SEM, Raman, TG and DTA analyses. pXRD revealed a secondary phase appearing at x= 0.25 in materials prepared by the sol-gel method and as early as x= 0.08 in materials prepared by the thermal solid-state method. Materials prepared by the thermal solid-state method required higher temperatures and longer times than materials prepared by the sol-gel method. The results showed that more fluorine can be incorporated in the LiCoO2 structure by the sol-gel than the solid-state method. The secondary phase was identified as lithium oxydifluoride, LiCoOF2. Relatively pure material with stoichiometry could be prepared by both methods. The space was determined as either 𝐶2 or 𝑃1 and the unit cell dimensions for the two alternatives are reported. This secondary phase has been reported in the literature, but had not been positively identified at the time of submission of this dissertation. Keywords: fluorinated LiCoO2; LiCoO2−xFx; sol-gel fluorination; solid-state fluorination; lithium oxydifluoride. mi2026 Chemical Engineering MEng Unrestricted SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production SDG-13: Climate action 2018-09-17T09:00:18Z 2018-09-17T09:00:18Z 2018 2017 Dissertation Ogbeifun, O 2017, Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/66580> A2018 http://hdl.handle.net/2263/66580 en © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Fluorinated LiCoO2 Sol-gel fluorination Lithium oxydifluoride Solid-state fluorination Engineering, built environment and information technology theses SDG-07 Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-13 Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries |
| title | Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries |
| title_full | Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries |
| title_fullStr | Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries |
| title_full_unstemmed | Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries |
| title_short | Sol-gel and solid-state fluorination of lithium cobalt oxide for Li-ion secondary batteries |
| title_sort | sol gel and solid state fluorination of lithium cobalt oxide for li ion secondary batteries |
| topic | UCTD Fluorinated LiCoO2 Sol-gel fluorination Lithium oxydifluoride Solid-state fluorination Engineering, built environment and information technology theses SDG-07 Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-12 Engineering, built environment and information technology theses SDG-13 |
| url | http://hdl.handle.net/2263/66580 |