Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery
Spinel-type Al3+-doped Li4Ti5O12 oxide with the nominal composition of Li4Ti4.85Al0.15O12 was synthesized by a cellulose-assisted glycine–nitrate combustion process at reduced temperatures. X-ray diffraction characterization demonstrated that all Al3+ was successfully incorporated into the spinel la...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/39385 |
| _version_ | 1848755577846497280 |
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| author | Cai, R. Yuan, T. Ran, R. Liu, X. Shao, Zongping |
| author_facet | Cai, R. Yuan, T. Ran, R. Liu, X. Shao, Zongping |
| author_sort | Cai, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Spinel-type Al3+-doped Li4Ti5O12 oxide with the nominal composition of Li4Ti4.85Al0.15O12 was synthesized by a cellulose-assisted glycine–nitrate combustion process at reduced temperatures. X-ray diffraction characterization demonstrated that all Al3+ was successfully incorporated into the spinel lattice structure after calcination at 700°C. The Al3+ doping did not have obvious effect on the phase formation and phase structure while it led to an increase in surface area and a decrease in crystallite size of the oxide. The discharge capacity, the rate performance and the cycling stability were all slightly improved after the Al3+ doping. First discharge capacity ∼221 mAh g−1 was achieved for the as-synthesized Li4Ti4.85Al0.15O12 from calcination at 700°C, higher than 189 mAh g−1 for the pristine Li4Ti5O12 prepared by the same way. Al3+ was likely incorporated into both Li+ tetrahedral site and Ti4+ octahedral site with the majority into the Ti4+ site. Al3+ doping into the Li+ tetrahedral site increased the reducibility of Ti4+; consequently comparable electronic conductivity was observed for Li4Ti5O12 and Li4Ti4.85Al0.15O12 after the reduction. However, it also induced a decrease of lithium-ion diffusion coefficient and a transition of rate-limiting step of the electrode reaction from electron charge transfer for Li4Ti5O12 to Li+ diffusion for Li4Ti4.85Al0.15O12. The improved performance from the Al3+ doping was mainly attributed to the increased surface area of the oxide. |
| first_indexed | 2025-11-14T08:58:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-39385 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:58:31Z |
| publishDate | 2011 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-393852017-09-13T14:26:49Z Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery Cai, R. Yuan, T. Ran, R. Liu, X. Shao, Zongping Spinel-type Al3+-doped Li4Ti5O12 oxide with the nominal composition of Li4Ti4.85Al0.15O12 was synthesized by a cellulose-assisted glycine–nitrate combustion process at reduced temperatures. X-ray diffraction characterization demonstrated that all Al3+ was successfully incorporated into the spinel lattice structure after calcination at 700°C. The Al3+ doping did not have obvious effect on the phase formation and phase structure while it led to an increase in surface area and a decrease in crystallite size of the oxide. The discharge capacity, the rate performance and the cycling stability were all slightly improved after the Al3+ doping. First discharge capacity ∼221 mAh g−1 was achieved for the as-synthesized Li4Ti4.85Al0.15O12 from calcination at 700°C, higher than 189 mAh g−1 for the pristine Li4Ti5O12 prepared by the same way. Al3+ was likely incorporated into both Li+ tetrahedral site and Ti4+ octahedral site with the majority into the Ti4+ site. Al3+ doping into the Li+ tetrahedral site increased the reducibility of Ti4+; consequently comparable electronic conductivity was observed for Li4Ti5O12 and Li4Ti4.85Al0.15O12 after the reduction. However, it also induced a decrease of lithium-ion diffusion coefficient and a transition of rate-limiting step of the electrode reaction from electron charge transfer for Li4Ti5O12 to Li+ diffusion for Li4Ti4.85Al0.15O12. The improved performance from the Al3+ doping was mainly attributed to the increased surface area of the oxide. 2011 Journal Article http://hdl.handle.net/20.500.11937/39385 10.1002/er.1741 restricted |
| spellingShingle | Cai, R. Yuan, T. Ran, R. Liu, X. Shao, Zongping Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery |
| title | Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery |
| title_full | Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery |
| title_fullStr | Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery |
| title_full_unstemmed | Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery |
| title_short | Preparation and re-examination of Li4Ti4.85Al0.15O12 as anode material of lithium-ion battery |
| title_sort | preparation and re-examination of li4ti4.85al0.15o12 as anode material of lithium-ion battery |
| url | http://hdl.handle.net/20.500.11937/39385 |