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Chalcogen-containing compound, method for preparing same, and thermoelectric element comprising same

A chalcogen and compound technology, which is applied in the field of chalcogen-containing compounds, their preparation and thermoelectric elements containing them, can solve the problems of inability to exhibit phase stability, low thermal conductivity thermoelectric characteristics, differential phase stability, etc. , to achieve the effect of excellent thermoelectric characteristics, excellent characteristics and low thermal conductivity

Active Publication Date: 2021-05-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, such chalcogen compounds are only stable in the temperature range of about 580 °C to 720 °C, and at lower temperatures, especially at the driving temperature of thermoelectric elements, they cannot behave due to decomposition into other phases. phase stability
[0010] Therefore, although the above-mentioned chalcogen compounds are expected to exhibit low thermal conductivity and excellent thermoelectric characteristics due to their face-centered cubic lattice structure containing a portion of vacant lattice sites, their temperature at about 580° C. or lower (corresponding to the general driving temperature of thermoelectric elements) exhibit poor phase stability, and thus have very limited applications as thermoelectric conversion materials

Method used

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  • Chalcogen-containing compound, method for preparing same, and thermoelectric element comprising same
  • Chalcogen-containing compound, method for preparing same, and thermoelectric element comprising same
  • Chalcogen-containing compound, method for preparing same, and thermoelectric element comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1: Chalcogen-containing compound (Na 0.2 Sn 4 Bi 2 Se 7 ) preparation

[0073] Sn, Bi, Se and Na in a molar ratio of 4:2:6.9(7-0.1):0.1 in a glove box 2 The respective high-purity raw material powders of Se were weighed, placed in a carbon crucible, and then charged into a quartz tube. The inside of the quartz tube was evacuated and sealed. The raw materials were kept at a constant temperature in an electric furnace at 620°C for 24 hours.

[0074] Thereafter, the quartz tube in which the reaction was performed was cooled with water to obtain an ingot, which was finely ground into powder having a particle size of 75 μm or less, and sintered by spark plasma (SPS) at a temperature of 620° C. and a pressure of 50 MPa Sintering was performed for 10 minutes, thereby preparing a chalcogen-containing compound Na 0.2 Sn 4 Bi 2 Se 7 .

Embodiment 2

[0075] Example 2: Chalcogen-containing compound (Na 0.4 Sn 4 Bi 2 Se 7 ) preparation

[0076] The chalcogen-containing compound Na was prepared by the same method as in Example 1 0.4 Sn 4 Bi 2 Se 7 , the difference is that Sn, Bi, Se and Na 2 The respective high purity raw material powders of Se were mixed in a glove box in a molar ratio of 4:2:6.8(7-0.2):0.2.

Embodiment 3

[0077] Example 3: Chalcogen-containing compound (Na 0.75 Sn 4 Bi 1.7 Se 7 ) preparation

[0078] The chalcogen-containing compound Na was prepared by the same method as in Example 1 0.75 Sn 4 Bi 1.7 Se 7 , the difference is that Sn, Bi, Se and Na 2 The respective high purity raw material powders of Se were mixed in a glove box at a molar ratio of 4:1.7:6.625(7-0.375):0.375.

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Abstract

The present invention relates to a novel chalcogen-containing compound exhibiting low thermal conductivity and excellent thermoelectric characteristics, and a method for preparing the same, and a thermoelectric element comprising the same, and even It also exhibits excellent phase stability at relatively low temperatures.

Description

technical field [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of Korean Patent Application No. 10-2016-0142891 filed on October 31, 2016 and Korean Patent Application No. 10-2017-0134204 filed on October 16, 2017 with the Korean Intellectual Property Office, The disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a novel chalcogen-containing compound, a method for producing the same, and a thermoelectric element comprising the same, which exhibit low thermal conductivity and excellent thermoelectric characteristics, and which are It also exhibits excellent phase stability at relatively low temperatures. Background technique [0004] Due to recent environmental problems caused by resource depletion and combustion, research on thermoelectric conversion materials using waste heat as one of the alternative energy sources is underway. [0005] The energy conversion eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G29/00H01L35/16H01L35/18
CPCC01B19/02C01P2002/72C01P2006/32C01P2006/40H10N10/852C01G29/006C01P2004/38H10N10/853C01B19/002C01P2002/76C01P2002/77H10N10/01
Inventor 闵裕镐朴哲熙
Owner LG CHEM LTD
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