Preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency

A technology with energy conversion efficiency and high output power, which is applied in the manufacture/processing of thermoelectric devices, junction lead-out materials of thermoelectric devices, sustainable manufacturing/processing, etc. It can solve the problem that output power density and energy conversion efficiency cannot be improved at the same time problems, to achieve the effect of improving practical application potential, reducing lattice thermal conductivity, and reducing total thermal conductivity

Active Publication Date: 2019-04-05
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The present invention solves the problem that the output power density and energy conversion efficiency of existing thermoelectric materials cannot b

Method used

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  • Preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency
  • Preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency
  • Preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency

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specific Embodiment approach 1

[0052] Embodiment 1: In this embodiment, a method for preparing a SnTe thermoelectric material with high output power density and energy conversion efficiency is carried out according to the following steps:

[0053] 1. According to the general chemical formula (SnTe) 2.94 (In 2 Te 3 ) 0.02 -(Cu 2 Te) 3x The stoichiometric ratio weighs Sn powder, Te powder, In powder and Cu powder, and then mixes them uniformly to obtain a mixture; where 0.04≤x≤0.08;

[0054] 2. Put the mixture in a quartz tube, seal the tube after vacuuming, place the sealed quartz tube in a high temperature muffle furnace, and raise the temperature of the muffle furnace to 1000 °C at a heating rate of 80 °C / h to 120 °C / h ℃~1150℃, and under the condition of 1000℃~1150℃, keep it warm for 6h~10h, and then reduce the temperature from 1000℃~1150℃ to 600℃ at a cooling rate of 60℃ / h~200℃ / h ~700°C, and at a temperature of 600°C~700°C, keep it warm for 24h~72h, and finally cool in the furnace to obtain ingots; ...

specific Embodiment approach 2

[0058] Embodiment 2: This embodiment differs from Embodiment 2 in that: in step 2, the temperature of the muffle furnace is raised to 1000°C to 1100°C at a heating rate of 100°C / h to 120°C / h. Others are the same as in the second embodiment.

specific Embodiment approach 3

[0059] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 2, the temperature is kept at 1000° C. to 1100° C. for 8 hours to 10 hours. Others are the same as in the first or second embodiment.

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Abstract

The present invention relates to a preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency, and relates to the preparation method for SnTethermoelectric material. The problem is solved that the output power density and energy conversion efficiency of the current thermoelectric materials cannot be improved at the same time. The preparation method comprises the steps that: 1, according to the stoichiometric ratio of (SnTe)2.94(In2Te3)0.02-(Cu2Te)3x, the Sn powder, the Te powder, the In powder and the Cu powder are weighed; the mixtureis put in a high-temperature muffle furnace to perform heat preservation at a high temperature, then cooling and heat preservation and finally furnace cooling to obtain ingot casting; and 3, the ingot casting is grinded and put in a graphite mold to perform sintering at a certain temperature and pressure to obtain In-Cu co-doped SnTe thermoelectric materials. The preparation method for SnTe thermoelectric materials with high output power density and energy conversion efficiency is suitable for preparation of the SnTe thermoelectric materials with high output power density and energy conversion efficiency.

Description

technical field [0001] The invention relates to a preparation method of a SnTe thermoelectric material. Background technique [0002] Thermoelectric materials are capable of converting thermal energy directly into electrical energy. Thermoelectric devices made of thermoelectric materials have the advantages of small size, no noise, high stability, and long life. They can be widely used in deep space exploration, industrial waste heat recovery and power generation, and other fields. Output power density and energy conversion efficiency are two important indicators for evaluating the practical application potential of thermoelectric materials, both of which are mainly determined by the power factor and thermoelectric figure of merit of the material. SnTe is an environmentally friendly medium-temperature thermoelectric material, but its intrinsic high carrier concentration leads to its low Seebeck coefficient and high thermal conductivity, so its power factor and thermoelectri...

Claims

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Application Information

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IPC IPC(8): H01L35/16H01L35/34C01B19/04
CPCC01B19/007H10N10/852H10N10/01Y02P20/10
Inventor 隋解和郭逢凯蔡伟
Owner HARBIN INST OF TECH
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