Synthesis and properties of CoO2, the x = 0 end member of the LixCoO2 and NaxCoO2 systems

Details Synthesis and properties of CoO2, the x = 0 end member of the LixCoO2 and NaxCoO2 systems Synthesis and properties of CoO2, the x = 0 end member of the LixCoO2 and NaxCoO2 systems

2007-08-19

arxiv.org/abs/0708.2528v1

Chemistry of Materials 19, 5063-5066 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 5 figures

Scientific paper

10.1021/cm0702464

We report here the synthesis of single-phase bulk samples of CoO2, the x = 0 end member of the AxCoO2 systems (A = Li, Na), from a pristine LiCoO2 sample using an electrochemical technique to completely de-intercalate lithium. Thus, synthesized CoO2 samples were found to be oxygen-stoichiometric and possess a crystal structure consisting of stacked triangular-lattice CoO2 layers only. The magnetic susceptibility of the CoO2 sample was revealed to be relatively large in its initial value and then level off as the temperature increases, suggesting that CoO2 is a Pauli-paramagnetic metal with itinerant electrons.

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