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Copper-selenium-based nano-composite thermoelectric material and preparation method thereof

A nano-composite, thermoelectric material technology, applied in thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, nanotechnology, etc. Advanced problems, to achieve the effect of low cost, uniform distribution and good thermoelectric performance

Active Publication Date: 2018-07-03
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Cu 2 Se and Cu 2 Copper is easily precipitated during the preparation of Te, which leads to an increase in the carrier concentration, which will greatly increase its thermal conductivity, thereby reducing the thermoelectric performance of the material.
On the other hand, the material prepared by this method has larger grains and weaker scattering of short-wave phonons

Method used

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  • Copper-selenium-based nano-composite thermoelectric material and preparation method thereof
  • Copper-selenium-based nano-composite thermoelectric material and preparation method thereof
  • Copper-selenium-based nano-composite thermoelectric material and preparation method thereof

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preparation example Construction

[0029] The preparation process of the present invention is realized through the processes of batching, ball milling (high energy ball milling) and discharge plasma sintering, figure 1 The process flow diagram for the preparation of this material is shown, specifically including: with the general formula Cu 2-x Se 1-y-z S y Te zThe stoichiometric ratio of / m%CNTs Weigh the high-purity powder of each element element and the carbon nanotubes with a mass percentage of m% as the initial raw materials. After weighing and charging, high-energy ball milling is performed to obtain nanocomposite thermoelectric material powder. The obtained nanocomposite thermoelectric material powder is then sintered by SPS to obtain a dense disc, and finally thermal conductivity, electrical conductivity, Seebeck and other performance tests are performed. The preparation method of the novel p-type nanocomposite thermoelectric material provided by the present invention is exemplarily described below....

Embodiment 1

[0037] Example 1: Cu 2 Se / 0.25%CNTs (x=0, y=0, z=0, m=0.25)

[0038] The high-purity powder raw materials Cu powder and Se powder were weighed at a molar ratio of 2:1, and then carbon nanotubes with a mass fraction of 0.25% were added. Then the powder raw material, carbon nanotubes and tungsten carbide balls were put into a ball mill jar made of tungsten carbide in an argon atmosphere glove box. The ball-to-material ratio is 10:1. Carry out high-energy ball milling again with the rotating speed of 500 revs per minute, and the ball milling time is 48 hours;

[0039] The nanocomposite material obtained by ball milling was subjected to spark plasma sintering (SPS sintering) at a sintering temperature of 480° C., a pressure of 65 MPa, and a sintering time of 5 minutes to obtain a dense bulk material.

[0040] like figure 2 As shown, the resulting Cu 2 The measurement of thermoelectric properties of Se / 0.25%CNTs bulk material shows that the material has high Seebeck coefficie...

Embodiment 2

[0041] Example 2: Cu 2 Se / 0.5%CNTs (x=0, y=0, z=0, m=0.5)

[0042] The high-purity powder raw materials Cu powder and Se powder were weighed at a molar ratio of 2:1, and then carbon nanotubes with a mass fraction of 0.5% were added. Then the powder raw material, carbon nanotubes and tungsten carbide balls were put into a ball mill jar made of tungsten carbide in an argon atmosphere glove box. The ball-to-material ratio is 10:1. Carry out high-energy ball milling again with the rotating speed of 500 revs per minute, and the ball milling time is 48 hours;

[0043] The nanocomposite material obtained by ball milling was subjected to spark plasma sintering (SPS sintering) at a sintering temperature of 480° C., a pressure of 65 MPa, and a sintering time of 5 minutes to obtain a dense bulk material.

[0044] like image 3 As shown, the resulting Cu 2 The measurement of thermoelectric properties of Se / 0.5%CNTs bulk material shows that in the measured temperature range (300-750K)...

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Abstract

The invention relates to a copper-selenium-based nano-composite thermoelectric material and a preparation method thereof. The p-type nano-composite thermoelectric material comprises Cu2 xSe1 y zSyTezand carbon nano-tubes distributed in the Cu2 xSe1 y zSyTez, 0<=x<=0.15, 0<=y<=1, 0<=z<=1, y+z<=1, and mass percentage of the carbon nanotubes <=2%. The raw materials used in the preparation method areabundant in source and low in cost; production process and production equipment are simple; and controllability and repeatability are good.

Description

technical field [0001] The invention relates to a copper-selenide-based nanocomposite thermoelectric material and a preparation method thereof, in particular to a novel p-type nanocomposite thermoelectric material and a preparation method thereof, belonging to the field of thermoelectric materials. Background technique [0002] Thermoelectric conversion materials are a class of clean energy materials that use the Seebeck effect and Peltier effect of the material itself to directly realize the mutual conversion between thermal energy and electrical energy. It can use natural temperature difference and industrial waste heat and waste heat to generate electricity, and can also be made into a refrigerator with no noise, no transmission device, and high reliability. The energy conversion efficiency of thermoelectric materials is determined by the high and low end temperatures of the materials and the intrinsic properties of the materials. For a certain use environment, the high ...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/22H01L35/34B82Y30/00
CPCB82Y30/00H10N10/852H10N10/855H10N10/01
Inventor 史迅赵琨鹏陈立东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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