Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9781871 | Journal of Physics and Chemistry of Solids | 2005 | 6 Pages |
Abstract
We report a detailed study of de-intercalation of Na from the compound NaxCoO2âδ using an electrochemical technique. We find evidence for stable phases with Na contents near the fractions xâ1/3, 1/2, 5/8, 2/3, and 3/4. Details regarding the floating-zone crystal growth of Na0.75CoO2 single crystals are discussed as well as results from magnetic susceptibility measurements. We observe the presence of significant oxygen deficiencies in powder samples of Na0.75CoO2âδ prepared in air, but not in single crystal samples prepared in an oxygen atmosphere. The oxygen deficiencies in a Na0.75CoO2âδ sample with δâ¼0.08 remain even after electrochemically de-intercalating to Na0.3CoO2âδ.
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Authors
F.C. Chou, E.T. Abel, J.H. Cho, Y.S. Lee,