Low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and preparation method thereof

A technology for waste heat recovery and thermoelectric modules, which is applied in the manufacture/processing of thermoelectric devices, and lead-out wire materials for thermoelectric devices. Strong anisotropy of thermoelectric properties, low earth reserves, and good self-compatibility

Active Publication Date: 2021-10-08
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the development history of the thermoelectric field is relatively long, the thermoelectric materials used in the low-temperature waste heat temperature zone (<600K) are still only bismuth telluride alloys
Bismuth telluride, due to its small forbidden band width, will have a serious bipolar effect at a temperature >450K, resulting in a decrease in thermoelectric performance. On the other hand, due to its poor self-compatibility, the typical conversion efficiency obtained in the end is usually 7%. the following
More importantly, tellurium, an important component of bismuth telluride alloys, has low earth reserves and low annual output, which limits the large-scale use of bismuth telluride devices

Method used

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  • Low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and preparation method thereof
  • Low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and preparation method thereof
  • Low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0055] A low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency, consisting of n-p thermoelectric elements, the n-type thermoelectric elements are composed of Mg 3.1 Y 0.01 SbBi is used as a thermoelectric semiconductor material, and its composition is recorded as Ni / Fe / Mg 3 SbBi / Fe / Ni, the p-type thermoelectric element is made of Cd 0.99 Ag 0.01 Sb is used as a thermoelectric semiconductor material, and its composition is recorded as Ni / Sb / CdSb / Sb / Ni, where Fe and Sb are Mg 3.1 Y 0.01 SbBi and Cd 0.99 Ag 0.01 Diffusion shielding layer of Sb, Ni as electrode, h Ni (i.e. the thickness of electrode Ni)=0.5-1.5mm (the present embodiment is preferably 0.9mm), h Sb,Fe (i.e. diffusion shielding layer Sb, the thickness of Fe)=0.05-0.3mm (the present embodiment is preferably 0.1mm), h CdSb,Mg3SbBi (that is, the thickness of the thermoelectric semiconductor material)=3-5mm (preferably 4mm in this embodiment), the n-p thermoelectric elemen...

Embodiment 2

[0069] Compared with Example 1, most of them are the same, except that in step (1) of this example, the thickness of the selective electrode layer Ni is 0.5mm, the thickness of the diffusion shielding layers Sb and Fe is 0.05mm, and the thickness of the thermoelectric material is 5mm.

Embodiment 3

[0071] Compared with Example 1, most of them are the same, except Ni / Fe / Mg in the present embodiment step (2) 3 The SbBi / Fe / Ni process conditions are as follows: under a pressure of 90 MPa, the temperature is raised to 600° C. at a rate of 150° C. per minute and kept for 90 minutes.

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Abstract

The invention relates to a low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and a preparation method thereof. The thermoelectric module comprises an insulating heat-conducting ceramic plate and an n-p thermoelectric unit which is fixed on the insulating heat-conducting ceramic plate and is connected in series by a metal diversion layer. The n-type thermoelectric element is composed of Ni / Fe / Mg3SbBi / Fe / Ni, and the p-type thermoelectric element is composed of Ni / Sb / CdSb / Sb / Ni. The thermoelectric material selected by the thermoelectric device belongs to antimonide, the composition elements of the thermoelectric material have the characteristics of high abundance and low price, and the thermoelectric material has thermoelectric performance comparable to that of a commercial Bi2Te3-based material. Compared with a traditional commercial Bi2Te3-based thermoelectric device, the thermoelectric device has the advantages of being high in conversion efficiency, wide in application temperature range, high in power-price ratio and the like, and the thermoelectric efficiency of the thermoelectric device is the highest value of the thermoelectric efficiency of a low-grade waste heat recovery temperature range at present. In addition, the thermoelectric module has relatively high thermal stability, the machinability of thermoelectric elements is high, and a necessary condition for realizing large-scale production and application is achieved.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and relates to a low-grade waste heat recovery antimonide thermoelectric module with high conversion efficiency and a preparation method thereof. Background technique [0002] Modern industrial energy consumption is serious, and more than 60% of the energy in various factories is dissipated in the form of waste heat. High-grade high-temperature waste heat is easier to reuse in industry, but low-temperature waste heat, which accounts for more than 50% of the total waste heat, cannot be recycled by traditional methods because of its low quality and low energy density. As a clean and silent energy conversion technology, thermoelectric power generation can directly convert waste heat into useful electricity, reducing the consumption of fossil fuels and releasing the ensuing environmental crisis. The thermoelectric conversion efficiency is usually determined by the dimensionless ther...

Claims

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Application Information

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IPC IPC(8): H01L35/18H01L35/34
CPCH10N10/853H10N10/01
Inventor 裴艳中李文卜中林
Owner TONGJI UNIV
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