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Changes in the Lattice Constants of Thin-Film LiCoO2 Cathodes at the 4.2 V Charged State

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dc.contributor.authorKim, Yong Jeong-
dc.contributor.authorLee, Eung-Kyu-
dc.contributor.authorKim, Hyemin-
dc.contributor.authorCho, Jaephil-
dc.contributor.authorCho, Young Whan-
dc.contributor.authorPark, Byungwoo-
dc.contributor.authorOh, Seung Mo-
dc.contributor.authorYoon, Jong Kyu-
dc.date.accessioned2009-07-24T07:02:40Z-
dc.date.available2009-07-24T07:02:40Z-
dc.date.issued2004-06-10-
dc.identifier.citationJ. Electrochem. Soc., 151, A1063 (2004)en
dc.identifier.issn0013-4651-
dc.identifier.issnhttp://dx.doi.org/10.1149/1.1759611-
dc.identifier.urihttp://hdl.handle.net/10371/5810-
dc.description.abstractThe 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.sponsorshipThis 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.isoen-
dc.publisherElectrochemical Societyen
dc.titleChanges in the Lattice Constants of Thin-Film LiCoO2 Cathodes at the 4.2 V Charged Stateen
dc.typeArticleen
dc.contributor.AlternativeAuthor김용정-
dc.contributor.AlternativeAuthor이응규-
dc.contributor.AlternativeAuthor김혜민-
dc.contributor.AlternativeAuthor조재필-
dc.contributor.AlternativeAuthor조영환-
dc.contributor.AlternativeAuthor박병우-
dc.contributor.AlternativeAuthor오승모-
dc.contributor.AlternativeAuthor윤종규-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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