High-performance BiTe-based composite thermoelectric material and preparation method thereof

A composite material, thermoelectric technology, applied in the direction of thermoelectric device node lead-out materials, chemical instruments and methods, energy input, etc., can solve the problems of poor material repeatability, unstable material performance, complex preparation process, etc. , the effect of conductivity improvement, high thermoelectric figure of merit

Pending Publication Date: 2022-03-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned materials will be affected by high-temperature melting and rapid cooling instability during the preparation process, and the requirements for equipment are high, the preparation process is more complicated, and the reproducibility of the prepared materials is poor, resulting in the performance of the prepared materials. unstable

Method used

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  • High-performance BiTe-based composite thermoelectric material and preparation method thereof
  • High-performance BiTe-based composite thermoelectric material and preparation method thereof
  • High-performance BiTe-based composite thermoelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] P-Bi 0.5 Sb 1.5 Te 3 The preparation method comprises the steps of:

[0048] 1) Ball milling and mixing: according to the general formula Bi x Sb 2-x Te 3-y Se y m z According to x=0.5, y=0, z=0, weigh the elemental powder of Bi, Sb, Te, Se, I, Br, Cu, Ag, Cd, Y, Yb, the total mass is 10g, and then put it into the ball mill jar Inside, filled with argon protection, under the condition of 260rpm, ball milled for 4h, then under the condition of 550rpm, ball milled for 12h.

[0049] 2) Cold pressing: Take it out under the protection of Ar gas, and then use a cold pressing machine to perform a cold pressing under the condition of 260MPa to form an alloy block for 2 hours.

[0050] 3) Solid sintering: Add a layer of carbon paper in the mold, then put the block material obtained by cold pressing directly into a graphite mold with an inner diameter of 12.7 mm, put it into an SPS device, and pressurize both ends of the mold, the pressure is 50MPa, vacuumize to 5Pa, the...

Embodiment 2

[0052] P type (Bi 0.5 Sb 1.5 Te 3 )Cu 0.005 A method for preparing a thermoelectric composite material, comprising the steps of

[0053] 1) Doping and mixing: Cu powder is doped into the Bi of Example 1 0.5 Sb 1.5 Te 3 Among them, according to the general formula (Bi 0.5 Sb 1.5 Te 3 )Cu n Weigh with n=0.005, and the total mass is 10g, then put it into a ball mill jar, fill it with argon protection, ball mill at 260rpm for 4h, and then at 550rpm for 12h.

[0054] 2) The remaining steps are the same as Step 2 and Step 3 of Embodiment 1.

Embodiment 3

[0056] P type (Bi 0.5 Sb 1.5 Te 3 ) (AgSbTe 2 )n (n=0.004) the preparation method of thermoelectric composite material, comprises the steps:

[0057] 1) Ball milling: first according to the general formula AgSbTe 2 The molar ratio of Ag, Sb, Te elemental powder was weighed, the total mass was 10g, and then put into a ball mill jar, filled with argon protection, ball milled at 260rpm for 4h, and then at 550rpm for 12h.

[0058] 2) Doping and mixing: the AgSbTe obtained in step 1 2 Powder is doped to embodiment one Bi 0.5 Sb 1.5 Te 3 In powder, according to the general formula (Bi 0.5 Sb 1.5 Te 3 ) (AgSbTe 2 )n in n = 0.004 to weigh, the total mass is 10g, then put into the ball mill jar, filled with argon protection, at 260rpm, ball mill for 4h, then at 550rpm, ball mill for 12h.

[0059] 3) The remaining steps are the same as Step 2 and Step 3 of Embodiment 1.

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Abstract

The invention discloses a high-performance BiTe-based composite thermoelectric material and a preparation method thereof. The general formula of the material is Bi < x > Sb < 2-x > Te < 3-y > SeyMz, wherein M is an alloy formed by one or more of Bi, Sb, Te and Se and one or more of I, Br, Cu, Ag, Cd, Y and Yb, or an alloy formed by one or more of I, Br, Cu, Ag, Cd, Y and Yb; x, y and z are molar molecule numbers and range from 0 to 1. The Bi2Te3-based thermoelectric material is loaded into a ball milling tank, ball milling is performed for 1-5 h under the condition of the rotating speed of 100-400 rpm, then ball milling is performed for 5-20 h under the condition of 400-800 rpm, alloyed thermoelectric material powder is obtained, the powder is cold-pressed into an alloy block by a cold press under the condition of 100-500 MPa, and then the alloy block is subjected to spark plasma sintering to form a compact block. The Bi2Te3-based thermoelectric composite material disclosed by the invention has the advantages of simple preparation method, high production efficiency, very high conductivity and power factor, low heat conductivity coefficient, good thermoelectric performance and the like.

Description

technical field [0001] The invention relates to the thermoelectric field, and relates to a multi-metal co-doped BiTe-based thermoelectric material and a preparation method. Background technique [0002] In recent years, with rapid population growth and rapid industrial development, excessive exploitation of fossil fuels, energy and environmental issues have become increasingly prominent, and the energy crisis and environmental crisis have attracted the attention of all countries. However, about 70% of the energy consumed globally every year is wasted in the form of waste heat. If the waste heat can be effectively recycled, the problem of energy shortage will be greatly alleviated. Thermoelectric materials can directly convert thermal energy into electrical energy, and have the advantages of no transmission parts, small size, no noise, no pollution, and good reliability. [0003] Thermoelectric technology can realize mutual conversion between thermal energy and electric ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00C01B19/04H01L35/16
CPCC01B19/002C01B19/007H10N10/852Y02P20/129
Inventor 姜鹏武建国包信和
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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