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Preparation method of polycrystalline SnSe-based thermoelectric material

A technology of thermoelectric materials and raw materials, which is applied in the manufacture/processing of thermoelectric devices, junction lead-out materials of thermoelectric devices, sustainable manufacturing/processing, etc., to achieve the effect of simple and easy method, improved thermoelectric performance, and good application prospects

Active Publication Date: 2020-08-04
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ren Zhifeng et al. prepared Na-doped polycrystalline SnSe by melting method combined with hot-pressing sintering, and its carrier concentration at room temperature reached about 2.7×10 19 cm -3 , ZT is 0.8 at 773K (Z.Ren et al J.Mater.Chem.A,2015), but there is still a lot of room for improvement in ZT value

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  • Preparation method of polycrystalline SnSe-based thermoelectric material
  • Preparation method of polycrystalline SnSe-based thermoelectric material
  • Preparation method of polycrystalline SnSe-based thermoelectric material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In this example, polycrystalline Sn 0.97 Na 0.03 The preparation method of Se thermoelectric material is as follows:

[0036] (1) According to Sn 0.97 Na 0.03 The stoichiometric ratio of Se takes Sn particles, Se particles and Na particles as reaction raw materials;

[0037] (2) The reaction raw materials weighed in the step (1) are packed into a clean and dry reaction vessel, the reaction vessel is evacuated to below 10Pa, and then the opening of the reaction vessel is sealed with an oxyacetylene flame;

[0038] (3) Place the sealed reaction vessel in a high-temperature sintering furnace, heat up to 920°C at a rate of 15°C / min, and then heat-preserve and smelt at 920°C for 30 minutes, and then swing for 30 minutes at a frequency of 5 r / min. is 60°;

[0039] (4) After the smelting is completed, turn off the power supply of the high-temperature sintering furnace, take out the reaction vessel, and cool it to room temperature in the air to obtain an ingot of SnSe-base...

Embodiment 2

[0043] In this example, polycrystalline Sn0.97 Na 0.03 The preparation method of Se thermoelectric material is as follows:

[0044] (1) According to Sn 0.97 Na 0.03 The stoichiometric ratio of Se takes Sn particles, Se particles and Na particles as reaction raw materials;

[0045] (2) The reaction raw materials weighed in the step (1) are packed into a clean and dry reaction vessel, the reaction vessel is evacuated to below 10Pa, and then the opening of the reaction vessel is sealed with an oxyacetylene flame;

[0046] (3) Place the sealed reaction vessel in a high-temperature sintering furnace, heat up to 920°C at a rate of 15°C / min, and then heat-preserve and smelt at 920°C for 30 minutes, and then swing for 30 minutes at a frequency of 5 r / min. is 60°;

[0047] (4) After the smelting is completed, turn off the power supply of the high-temperature sintering furnace, take out the reaction vessel, and cool it to room temperature in the air to obtain an ingot of SnSe-based ...

Embodiment 3

[0051] In this example, polycrystalline Sn 0.97 Na 0.03 The preparation method of Se thermoelectric material is as follows:

[0052] (1) According to Sn 0.97 Na 0.03 The stoichiometric ratio of Se takes Sn particles, Se particles and Na particles as reaction raw materials;

[0053] (2) The reaction raw materials weighed in the step (1) are packed into a clean and dry reaction vessel, the reaction vessel is evacuated to below 10Pa, and then the opening of the reaction vessel is sealed with an oxyacetylene flame;

[0054] (3) Place the sealed reaction vessel in a high-temperature sintering furnace, raise the temperature to 920°C at a rate of 15°C / min, then heat-preserve and smelt at 920°C for 30 minutes, and then swing for 30 minutes at a frequency of 5 r / min. The angle is 60°;

[0055] (4) After the smelting is completed, turn off the power supply of the high-temperature sintering furnace, take out the reaction vessel, and cool it to room temperature in the air to obtain a...

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Abstract

The invention provides a preparation method of a polycrystalline SnSe-based thermoelectric material. According to the method, a SnSe-based polycrystalline cast ingot is prepared through smelting; oneor more of Te, Se, Pb, Br, Sn, Sb and Bi are added in the ball milling process of the cast ingot to serve as sintering aids, and powder is obtained; and the powder is subjected to hot pressed sintering to form a block. According to the method, recrystallization and directional rearrangement of crystal grains can be promoted, the orientation degree of the crystal grains is improved, and the texturedegree of the SnSe-based thermoelectric material is optimized, so that the thermoelectric performance of the SnSe-based thermoelectric material is improved, and the SnSe-based thermoelectric materialhas good application prospects.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric materials, and relates to a preparation method of polycrystalline SnSe-based thermoelectric materials. Background technique [0002] Thermoelectric materials use the transport energy of phonons and carriers to directly realize the mutual conversion of electrical energy and thermal energy. In the past few years, as a new type of green, energy-saving and environmentally friendly material, thermoelectric (TE) materials have attracted continuous attention from all over the world. Due to the advantages of small size, no noise, no external transmission device, low cost, energy saving and environmental protection, thermoelectric equipment is gradually being used in the market and has a bright future. [0003] The performance of thermoelectric materials is defined by the dimensionless thermoelectric figure of merit (ZT value): ZT=S 2 σT / κ, where S is the Seebeck coefficient, σ is the electrical c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L35/16H01L35/34H10N10/852H10N10/01
CPCH10N10/852H10N10/01Y02P20/10
Inventor 张家华徐静涛蒋俊乐松江浩川
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI