Thermoelectric properties of LiCo 1− x M x O 2 (M = Cu, Mg, Ni, Zn): Comparison with Li y CoO 2 and Na y CoO 2 systems
Year: 2017
Type: article
Abstract: Li y CoO 2 has a similar layered structure to Na y CoO 2 , which is a typical p-type oxide thermoelectric material, and the average Co valence of 3 + y is controlled by the Li content y . We investigated the thermoelectric properties of LiCo 1− x M x O 2 samples (M = Cu, Mg, Ni, Zn) for the first time at high temperatures, in which Co 3+ was substituted by the divalent M 2+ ions, and the average Co valence of 3 + x can be controlled similarly to the Li content y in Li y CoO 2 . The substitution of the M 2+ ions for the Co site was found to show thermoelectric properties similar to those of Li y CoO 2 with the same average Co valence. The Mg-doped sample showed the highest thermoelectric performance at high temperatures in this study; the thermoelectric power factor P is 2.38 × 10 −4 W m −1 K −2 at 1173 K and the dimensionless figure of merit ZT is 0.024 at 876 K. The thermoelectric potential of LiCo 1− x M x O 2 is discussed and compared with those of Li y CoO 2 and Na y CO 2 systems.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2570023363