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

Abstract

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.

18 pages, 5 figures

References in corpus (3)

• Doping effects on the electronic and structural properties of CoO2: An LSDA+U study
• Evidence of a single nonmagnetic Co3+ state in the Na1CoO2 cobaltate
• Na${}_x$CoO${}_2$ in the x -> 0 Regime: Coupling of Structure and Correlation effects

Cited by in corpus (7)

• Electronic phase diagram of the layered cobalt oxide system, LixCoO2 (0.0 <= x <= 1.0)
• Impact of lithium composition on the thermoelectric properties of the layered cobalt oxide system LixCoO2
• Prediction of Li intercalation voltages in rechargeable battery cathode materials: effects of exchange-correlation functional, van der Waals interactions, and Hubbard $U$
• Compositional phase stability of strongly correlated electron materials within DFT+$U$
• Self-regulated ligand-metal charge transfer upon lithium ion de-intercalation process from LiCoO2 to CoO2
• Electrochemical synthesis and properties of CoO2, the x = 0 phase of the AxCoO2 systems (A = Li, Na)
• Stable CoO${}_2$ Nanoscrolls With Outstanding Electrical Properties