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Development of Mg 2 (SiSn) Thermoelectric Material for Automobile

Journal Article
2015-01-1695
ISSN: 1946-4614, e-ISSN: 1946-4622
DOI: https://doi.org/10.4271/2015-01-1695
Published April 14, 2015 by SAE International in United States
Development of Mg <sub>2</sub> (SiSn) Thermoelectric Material for Automobile
Sector:
Citation: Tada, S., Nagai, T., Shioda, N., Fujiu, H. et al., "Development of Mg2(SiSn) Thermoelectric Material for Automobile," SAE Int. J. Passeng. Cars – Electron. Electr. Syst. 8(2):442-448, 2015, https://doi.org/10.4271/2015-01-1695.
Language: English

Abstract:

As an appropriate material for automotive thermoelectric generators, which directly convert waste heat of exhaust gas into electricity, we have developed Mg2(Si1-xSnx) thermoelectric materials with high thermoelectric performance. The performance is evaluated with the dimensionless figure of merit (ZT), and the ZT has been improved through the development of the fabrication process and the investigation of the optimum composition and dopant element. A novel liquid-solid reaction synthesis method incorporating hotpressing for the sample fabrication was effective in reducing the thermal conductivity. The n-type Mg2(Si0.50Sn0.50) doped with Sb attained a high ZT of 1.1 at 620 K. The p-type Mg2(Si0.25Sn0.75) doped with Li and Ag simultaneously achieved a ZT of 0.3 at 600 K. The effective maximum power of n-type thermoelectric element and that of p-type were calculated with the thermoelectromotive force and the mean resistivity. The calculated power generation showed the possibility of improving fuel consumption in automobiles.

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