An [alpha]-MgAgSb-based nano composite thermoelectric material and a preparation method thereof

Abstract

The invention belongs to the technical field of preparation of thermoelectric materials, and discloses an [alpha]-MgAgSb-based nano-composite thermoelectric material and preparation method thereof, wherein the composite thermoelectric material is prepared by mixing undoped [alpha]-MgAgSb thermoelectric material with SnTe nano-materials to obtain the [alpha]-MgAgSb-based nanocomposite thermoelectric material. The invention improves the composition of the doped substance and the corresponding preparation method, by adding a single-phase [alpha]-MgAgSb material with Nanocomposite narrow band gapp-type SnTe semiconductors to obtain the MgAgSb-based nano-composite thermoelectric material, can greatly improve the thermal conductivity of The thermoelectric properties of the [alpha]MgAgSb-based materials, is obviously improved in effect than conventional lattice doped [alpha]MgAgSb thermoelectric material, has a good prospect of industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of preparation of thermoelectric materials, and more specifically relates to an α-MgAgSb-based nanocomposite thermoelectric material and a preparation method thereof. Material. Background technique [0002] The maximum efficiency of energy conversion of thermoelectric materials for thermoelectric power generation is limited by the thermoelectric figure of merit ZT of thermoelectric materials: [0003] [0004] Based on the above formula, the thermoelectric figure of merit ZT is related to the Seebeck coefficient (S), electrical conductivity (σ) and thermal conductivity (κ) of the material at the working temperature. Among these three mutually coupled parameters, S 2 σ characterizes the electrical transport capability of the material, which is called the power factor (PF for short), while κ characterizes the thermal transport capacity of the material. Therefore, in order to obtain maximum energy conversi...

AI Technical Summary

Problems solved by technology

For α-MgAgSb materials, the α-MgAgSb matrix prepared by the existing high-temperature melting method and mechanical alloying method (see ① Ying, P., Li, X., Wang, Y., Yang, J., Fu, C. , Zhang, W., Zhu, T, et al. Advanced Functional Materials, 2017, 27(1), 1604145; ② Liu, Z., Wang, Y., Mao, J., Geng, H., Shuai, J., Wang, Y., Ren, Z, et al. Advanced Energy Materials, 2016, 6(7), 1502269.), currently there are the following main problems: (1) α-MgAgSb has low conductivity and low power factor

(2) The power factor of α-MgAgSb can be increased by about 10% to 20% by conventional lattice doping methods, and the effect is not significant

(3) Conventional lattice doping elements such as Pb, La, Yb and other elements have the disadvantages of high toxicity, environmental protection, and high cost.

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