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Lithium intercalation reactions with transition metal oxides
An investigation of several lithium transition metal oxide systems has been undertaken with the aim of synthesising an optimised LiM0₂ compound (M = Mn, Co or Co/Ni mixtures) for application as a cathode in rechargeab1e lithium batteries. Attention has been focused on systems which show promise for...
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| Format: | Thesis |
| Language: | English |
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Department of Chemistry
2016
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| _version_ | 1867613203358285824 |
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| access_status_str | Open Access |
| author | Gummow, Rosalind June |
| author2 | Thackeray, Michael |
| author_browse | Gummow, Rosalind June Thackeray, Michael |
| author_facet | Thackeray, Michael Gummow, Rosalind June |
| author_sort | Gummow, Rosalind June |
| collection | Thesis |
| description | An investigation of several lithium transition metal oxide systems has been undertaken with the aim of synthesising an optimised LiM0₂ compound (M = Mn, Co or Co/Ni mixtures) for application as a cathode in rechargeab1e lithium batteries. Attention has been focused on systems which show promise for application as cathodes in rocking-chair cells which do not contain metallic lithium anodes. A novel lithium cobalt oxide, LT-LiCoO₂ (LT for low temperature), has been synthesised at 400°C. This compound has near-cubic symmetry and can be indexed to either a trigonal unit cell (space group R3m) with a=2.830(1)Å and c=l3.875(8) Å, or to a face-centred cubic unit cell (space group Fd3m) with a=8.002(1)A. The near-cubic symmetry is maintained on delithiation. Neutron and X-ray powder diffraction refinement of the LT-LiCoO₂ sample has shown it to be best described as a layered structure (R3m symmetry) with approximately 6% of the cobalt cations in the predominantly lithium layer and vice versa. An acid-leached sample LT-Liₒ₄.4CoO₂ was, however, shown to have a defect spinel structure. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/19039 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:24.523Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Chemistry |
| publisherStr | Department of Chemistry |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/19039 Lithium intercalation reactions with transition metal oxides Gummow, Rosalind June Thackeray, Michael Nassimbeni, Luigi R Chemistry An investigation of several lithium transition metal oxide systems has been undertaken with the aim of synthesising an optimised LiM0₂ compound (M = Mn, Co or Co/Ni mixtures) for application as a cathode in rechargeab1e lithium batteries. Attention has been focused on systems which show promise for application as cathodes in rocking-chair cells which do not contain metallic lithium anodes. A novel lithium cobalt oxide, LT-LiCoO₂ (LT for low temperature), has been synthesised at 400°C. This compound has near-cubic symmetry and can be indexed to either a trigonal unit cell (space group R3m) with a=2.830(1)Å and c=l3.875(8) Å, or to a face-centred cubic unit cell (space group Fd3m) with a=8.002(1)A. The near-cubic symmetry is maintained on delithiation. Neutron and X-ray powder diffraction refinement of the LT-LiCoO₂ sample has shown it to be best described as a layered structure (R3m symmetry) with approximately 6% of the cobalt cations in the predominantly lithium layer and vice versa. An acid-leached sample LT-Liₒ₄.4CoO₂ was, however, shown to have a defect spinel structure. 2016-04-20T14:14:12Z 2016-04-20T14:14:12Z 1993 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/19039 eng application/pdf Department of Chemistry Faculty of Science University of Cape Town |
| spellingShingle | Chemistry Gummow, Rosalind June Lithium intercalation reactions with transition metal oxides |
| thesis_degree_str | Doctoral |
| title | Lithium intercalation reactions with transition metal oxides |
| title_full | Lithium intercalation reactions with transition metal oxides |
| title_fullStr | Lithium intercalation reactions with transition metal oxides |
| title_full_unstemmed | Lithium intercalation reactions with transition metal oxides |
| title_short | Lithium intercalation reactions with transition metal oxides |
| title_sort | lithium intercalation reactions with transition metal oxides |
| topic | Chemistry |
| url | http://hdl.handle.net/11427/19039 |
| work_keys_str_mv | AT gummowrosalindjune lithiumintercalationreactionswithtransitionmetaloxides |