A kind of α-mgagsb-based nanocomposite thermoelectric material and its preparation method

Abstract

The invention belongs to the technical field of preparation of thermoelectric materials, and discloses an α-MgAgSb-based nano-composite thermoelectric material and a preparation method thereof, wherein the composite thermoelectric material is doped with SnTe nanomaterials in an undoped α-MgAgSb thermoelectric material , thus obtaining the α-MgAgSb-based nanocomposite thermoelectric material. The present invention improves the composition of the doping substance and the corresponding preparation method, and prepares an α-MgAgSb nanocomposite thermoelectric material by doping a nanocomposite narrow-bandgap p-type SnTe semiconductor into the single-phase α-MgAgSb material. The thermoelectric performance of the α-MgAgSb-based material is greatly improved, which is significantly improved compared with the conventional lattice-doped α-MgAgSb thermoelectric material, and has good industrial production and application prospects.

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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