| Names | |
|---|---|
| Other names
sodium cobaltate
| |
| Identifiers | |
3D model (JSmol)
|
|
| |
| |
| Properties | |
| CoNaO2 | |
| Molar mass | 113.921 g·mol−1 |
| Density | 4.95 g·cm−3[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Sodium cobalt oxide, also called sodium cobaltate, is any of a range of compounds of sodium, cobalt, and oxygen with the general formula Na
xCoO
2 for 0 < x ≤ 1. The name is also used for hydrated forms of those compounds, Na
xCoO
2·yH
2O.
The anhydrous compound was first synthesized in the 1970s.[2] It conducts like a metal, and has exceptional thermoelectric properties (for 0.5 ≤ x ≤ 0.75) combining a large Seebeck coefficient with low resistivity, as discovered in 1997 by Ichiro Terasaki's research group.[2] A hydrate form was found to be superconducting below 5 K.[2] The compound, and its manganese analog, could be a cheaper alternative to the analogous lithium compounds.[3]
- ^ Jansen, M.; Hoppe, R. Oxocobaltates of sodium. Zeitschrift fuer Anorganische und Allgemeine Chemie, 1974. 408 (2): 104-106. ISSN 0044-2313.
- ^ a b c Barbara Goss Levi (2003), "Intriguing Properties Put Sodium Cobalt Oxide in the Spotlight". Physics Today, volume 56, issue 8, page 15. doi:10.1063/1.1611341
- ^ T. J. Willis, D. G. Porter, D. J. Voneshen, S. Uthayakumar, F Demmel, M. J. Gutmann, K. Refson, and J. P. Goff (2018) "Diffusion mechanism in the sodium-ion battery material sodium cobaltate". Scientific Reports, volume 8, report 3210. doi:10.1038/s41598-018-21354-5