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Changes in the Lattice Constants of Thin-Film LiCoO2 Cathodes at the 4.2 V Charged State
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Kim, Yong Jeong | - |
dc.contributor.author | Lee, Eung-Kyu | - |
dc.contributor.author | Kim, Hyemin | - |
dc.contributor.author | Cho, Jaephil | - |
dc.contributor.author | Cho, Young Whan | - |
dc.contributor.author | Park, Byungwoo | - |
dc.contributor.author | Oh, Seung Mo | - |
dc.contributor.author | Yoon, Jong Kyu | - |
dc.date.accessioned | 2009-07-24T07:02:40Z | - |
dc.date.available | 2009-07-24T07:02:40Z | - |
dc.date.issued | 2004-06-10 | - |
dc.identifier.citation | J. Electrochem. Soc., 151, A1063 (2004) | en |
dc.identifier.issn | 0013-4651 | - |
dc.identifier.issn | http://dx.doi.org/10.1149/1.1759611 | - |
dc.identifier.uri | https://hdl.handle.net/10371/5810 | - |
dc.description.abstract | The lattice constants of thin-film Li12xCoO2 cathodes at the 4.2 V charged states were influenced by various deposition conditions.
Li12xCoO2 thin films @yielding a strong ~003! texture# on a Pt or Au current collector, which were unheated during sputtering deposition and ex situ annealed, showed negligible lattice expansion at 4.2 V during the first charge. This is in contrast to the Li12xCoO2 powders exhibiting ;3% c axis expansion at x > 0.5 ~from ;14.05 to ;14.45 Å!. The total energy of the constrained Li0.5CoO2 lattice ~0% c axis expansion! obtained by a pseudopotential total-energy calculation was slightly higher than that of the relaxed one by ;1.0 eV per 12 Li0.5CoO2 ~or ;80 meV/Li0.5CoO2), indicating no difficulty of limited lattice expansion during the first cycle. However, splitting of the ~009! diffraction peak was observed at 4.2 V as cycling proceeded: one has a lattice constant c of 14.01 6 0.05 Å as LiCoO2 before charging, and the other has a lattice parameter of 14.40 6 0.05 Å, which is similar to the Li0.5CoO2 powders. In contrast, the lattice constants c of the Li12xCoO2 thin films deposited at different conditions @yielding a weak ~003! texture# expanded when first charged to 4.2 V, which is similar to that observed in the powder geometry. | en |
dc.description.sponsorship | This work was supported by the Center for Nanostructured Materials
Technology under the 21C Frontier Programs of the Ministry of Science and Technology, by KOSEF through the Research Center for Energy Conversion and Storage at Seoul National University, and by Kumoh National Institute of Technology. | en |
dc.language.iso | en | - |
dc.publisher | Electrochemical Society | en |
dc.title | Changes in the Lattice Constants of Thin-Film LiCoO2 Cathodes at the 4.2 V Charged State | en |
dc.type | Article | en |
dc.contributor.AlternativeAuthor | 김용정 | - |
dc.contributor.AlternativeAuthor | 이응규 | - |
dc.contributor.AlternativeAuthor | 김혜민 | - |
dc.contributor.AlternativeAuthor | 조재필 | - |
dc.contributor.AlternativeAuthor | 조영환 | - |
dc.contributor.AlternativeAuthor | 박병우 | - |
dc.contributor.AlternativeAuthor | 오승모 | - |
dc.contributor.AlternativeAuthor | 윤종규 | - |
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