Method for enhancing thermoelectric performance of Sb2Te3-based material

A thermoelectric performance and base material technology, which is applied in the field of improving the thermoelectric performance of Sb2Te3 base materials, can solve the problems that the performance and process cannot meet the actual application requirements, and achieve the effects of optimizing electrical transmission performance, improving thermoelectric performance, and enhancing phonon scattering

Active Publication Date: 2018-05-08
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently prepared P-type Sb 2 Te 3 The performance and process of base thermoelectric materials still cannot meet the needs of practical applications, so how to effectively improve their thermoelectric performance is still one of the focuses of current research

Method used

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  • Method for enhancing thermoelectric performance of Sb2Te3-based material
  • Method for enhancing thermoelectric performance of Sb2Te3-based material
  • Method for enhancing thermoelectric performance of Sb2Te3-based material

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Embodiment Construction

[0035] A raised Sb 2 Te 3 The method for the thermoelectric performance of the base material, the specific steps are as follows:

[0036] (1) Bi 2 Te 3 , Sb 2 Te 3 The ingot is crushed into particles with a particle size of 2 to 5mm; then it is vacuum ball-milled on a planetary ball mill to form a powder with a particle size of several hundred nanometers to several microns, and the shape is as follows image 3 shown;

[0037] Among them, the ball milling process on the planetary ball mill is as follows: the ball-to-material ratio is 8:1, the speed is 450rpm, and the speed ratio is 2:1. Both the grinding pot and the balls are A-grade agate. -0.5MPa.

[0038] Bi 2 Te 3 , Sb 2 Te 3 The ingot preparation method is as follows:

[0039] According to Bi 2 Te 3 , Sb 2 Te 3 Stoichiometric ratio Weigh 30g of Bi, Te, Sb pure component particles in a ceramic crucible, and cover 5gB 2 o 3 Protect; prepare Bi by melting in SK2 type box-type resistance furnace 2 Te 3 , Sb...

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Abstract

The invention relates to a method for enhancing the thermoelectric performance of a Sb2Te2-based material. N-type Bi2Te3 is introduced to a P-type sb2Te3 thermoelectric material, and a PN junction isformed to enhance the thermoelectric performance of the Sb2Te3-based material, and the control of the concentration of the PN junction in a material matrix is realized through adjustment of the proportion of two phases; when the stoichiometric ratio of Bi2Te3 to Sb2Te3 is 0.15:0.85, the material has the best electrical performance, and the maximum PF during 328K is 26.34 [mu]W K<-2>cm<-1>; the thermal conductivity of the material is substantially reduced due to the scattering of carriers and phonons, and the thermal conductivity during 451K is 0.89W m<-1>K<-1>; and therefore, the sample has the optimal thermoelectric performance, the ZTmax during 401K reaches 1.03 (increased by 25.6% compared with the pure-phase Sb2Te3), and the maximum ZTave=0.89 (increased by 40.2% compared with the pure-phase Sb2Te3) is obtained in a whole test temperature area (300-550K).

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material preparation, in particular to a method for promoting Sb 2 Te 3 A method for the thermoelectric properties of base materials. Background technique [0002] With the continuous development of the global economy, the traditional primary fossil energy is increasingly exhausted, and the environmental pollution caused by excessive use and improper post-processing is becoming more and more serious. Therefore, the development of clean energy and new energy materials has attracted widespread attention. [0003] Thermoelectric materials are functional materials that directly convert thermal energy and electrical energy through the transport of carriers in solids. Thermoelectric power generation or thermoelectric refrigeration devices made with thermoelectric materials as the core have the advantages of no noise, no pollution, low maintenance costs, long service life, small size, etc., and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/34H10N10/01
CPCH10N10/01
Inventor 祖方遒王小宇黄中月孙超许飞孙志豪徐亮
Owner HEFEI UNIV OF TECH
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