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Thermoelectric conversion element, and method for production thereof

A technology of thermoelectric conversion and thermoelectric conversion materials, which is applied in the manufacture/processing of thermoelectric devices, materials for junction leads of thermoelectric devices, transportation and packaging, etc. It can solve the problems of thermal conductivity κ increase, effective mass reduction, Seebeck coefficient α Reduce and other problems, to achieve the effect of performance index ZT improvement and performance improvement

Inactive Publication Date: 2012-03-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, in general, even if the electrical conductivity σ increases, it will also lead to an increase in thermal conductivity κ and a decrease in Seebeck coefficient α
Also, since there is an inverse relationship between effective mass and mobility, to increase mobility, the effective mass will decrease

Method used

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  • Thermoelectric conversion element, and method for production thereof
  • Thermoelectric conversion element, and method for production thereof
  • Thermoelectric conversion element, and method for production thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0066] 2.0 g of sodium borohydride as a reducing agent was mixed with 100 mL of ethanol. On the other hand, 0.9 g of cobalt chloride, 3.6 g of antimony chloride, and 0.18 g of nickel chloride were mixed with 100 mL of ethanol, and the solution was added dropwise to the above-mentioned sodium borohydride solution. The cobalt, antimony and nickel particles thus formed were washed with a mixed solution of ethanol and water (mixing ratio 1:1) to remove impurities.

[0067] The obtained slurry containing cobalt, antimony, and nickel particles was hydrothermally treated at 240° C. for 24 hours. At this time, due to the excessive presence of nickel and antimony, the target thermoelectric conversion material Co 0.9 Ni 0.1 Sb 3 Since it exists in an amount above the solid solution limit, it precipitates as NiSb in the thermoelectric conversion material. Then, the thermoelectric conversion element of the present invention was obtained by SPS sintering at 500°C. Figure 5 A TEM imag...

Embodiment 2

[0074] 0.7 g of sodium borohydride as a reducing agent was mixed with 100 mL of ethanol. On the other hand, 0.8 g of nickel chloride and 0.77 g of antimony chloride were mixed with 100 mL of ethanol, and this solution was added dropwise to the above-mentioned sodium borohydride solution. In this way, nickel-antimony particles were produced, and the NiSb alloy particles having an average particle diameter of 10 to 20 nm were obtained by hydrothermal treatment at 240° C. for 24 hours. 0.6 g of this NiSb alloy particle was added to 100 mL of ethanol, and 1.7 g of sodium borohydride was further added.

[0075] 0.9 g of cobalt chloride, 2.7 g of antimony chloride, and 0.057 g of nickel chloride were mixed in 100 mL of ethanol, and the solution was added dropwise to the above-mentioned NiSb alloy-containing ethanol solution. In this way, Co, Ni and Sb particles are precipitated around the NiSb alloy. Then, by performing hydrothermal treatment at 240° C. for 24 hours, composite par...

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Abstract

Disclosed is a thermoelectric conversion element comprising: a thermoelectric conversion material; and metal or alloy particles which have an average particle diameter of 1 to 100 nm and are dispersed in the thermoelectric conversion material, wherein at least some of the metal or alloy particles are dispersed at a space equal to or smaller than the mean free path of a phonon of the thermoelectric conversion material.

Description

technical field [0001] The present invention relates to a thermoelectric conversion element containing metal or alloy particles and a manufacturing method thereof. Background technique [0002] A thermoelectric conversion material is a material that can convert heat energy and electric energy into each other, and is a material constituting a thermoelectric conversion element used as a thermoelectric cooling element or a thermoelectric power generation element. This thermoelectric conversion material performs thermoelectric conversion using the Seebeck effect, and its thermoelectric conversion performance is represented by the following equation (1) called performance index ZT. [0003] ZT = α 2 σT / κ (1) [0004] (In the above formula, α represents the Seebeck coefficient, σ represents the electrical conductivity, κ represents the thermal conductivity, and T represents the measurement temperature.) [0005] It can be seen from the above formula (1) that in order to improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/26B22F1/02H01L35/18B22F9/24H01L35/34B22F1/17
CPCB22F9/24C22C18/00H01L35/18B22F2998/00H01L35/34H01L35/26B22F1/025C22C12/00C22C23/00B22F1/17H10N10/857H10N10/853H10N10/01B22F1/07B22F1/054
Inventor 村井盾哉木太拓志
Owner TOYOTA JIDOSHA KK
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