Thermoelectric properties of LiCo1-xMxO2 (M = Cu, Mg, Ni, Zn): Comparison with LiyCoO2 and NayCoO2 systems

Shu Mizuno, Hiroyuki Fujishiro, Mamoru Ishizawa, Tomoyuki Naito, Hirokazu Katsui, Takashi Goto

研究成果: Article査読

3 被引用数 (Scopus)

抄録

LiyCoO2 has a similar layered structure to NayCoO2, 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 LiCo1-xMxO2 samples (M = Cu, Mg, Ni, Zn) for the first time at high temperatures, in which Co3+ was substituted by the divalent M2+ ions, and the average Co valence of 3 + x can be controlled similarly to the Li content y in LiyCoO2. The substitution of the M2+ ions for the Co site was found to show thermoelectric properties similar to those of LiyCoO2 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 LiCo1-xMxO2 is discussed and compared with those of LiyCoO2 and NayCO2 systems.

本文言語English
論文番号021101
ジャーナルJapanese journal of applied physics
56
2
DOI
出版ステータスPublished - 2017 2月

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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