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Thermoelectric nano composite material and preparation method thereof
The invention discloses a thermoelectric nano composite material and a preparation method thereof, and belongs to the technical field of thermoelectric composite material preparation. According to the invention, a small amount of CuI is doped in a Bi2Te2. 2Se0.8-SiC base material, the ZT value of the obtained thermoelectric material is stabilized at about 0.85 in a temperature range of 200-300 DEG C, and Cu/I doping shows a self-regulation behavior; due to the increase of the doping concentration, the conductivity at high temperature is improved, and intrinsic excitation is effectively inhibited; in addition, due to the fact that the in-situ CuI nanometer precipitate serves as a phonon scattering center, the lattice heat conductivity is greatly reduced, the bipolar heat conductivity is reduced by 60% or above, the highest use temperature of the material is increased, and therefore the conversion efficiency is greatly improved. The prepared material is suitable for being combined with a traditional cast ingot in a segmented mode, the ZT value of a device reaches up to about 0.9-1.0, and the conversion efficiency within the range of 300-573K reaches 9.2%.
本发明公开了一种热电纳米复合材料及其制备方法，属于热电复合材料制备技术领域。本发明通过在Bi2Te2.2Se0.8‑SiC基材中掺杂少量CuI，获得的热电材料在200～300℃的温度范围内ZT值稳定在0.85左右，且Cu/I掺杂表现出自调节行为；掺杂浓度的增加提高了高温下的电导率并有效抑制了本征激发；此外，由于“原位”CuI纳米析出物充当声子散射中心，晶格热导率大大降低，双极热导率降低60％以上，提高了材料的最高使用温度，从而大大提高了转换效率。且本发明制备得到的材料适用于和传统铸锭进行分段组合，器件ZT值高达0.9～1.0左右，并且在300～573K范围内的转换效率达到9.2％。
Thermoelectric nano composite material and preparation method thereof
The invention discloses a thermoelectric nano composite material and a preparation method thereof, and belongs to the technical field of thermoelectric composite material preparation. According to the invention, a small amount of CuI is doped in a Bi2Te2. 2Se0.8-SiC base material, the ZT value of the obtained thermoelectric material is stabilized at about 0.85 in a temperature range of 200-300 DEG C, and Cu/I doping shows a self-regulation behavior; due to the increase of the doping concentration, the conductivity at high temperature is improved, and intrinsic excitation is effectively inhibited; in addition, due to the fact that the in-situ CuI nanometer precipitate serves as a phonon scattering center, the lattice heat conductivity is greatly reduced, the bipolar heat conductivity is reduced by 60% or above, the highest use temperature of the material is increased, and therefore the conversion efficiency is greatly improved. The prepared material is suitable for being combined with a traditional cast ingot in a segmented mode, the ZT value of a device reaches up to about 0.9-1.0, and the conversion efficiency within the range of 300-573K reaches 9.2%.
本发明公开了一种热电纳米复合材料及其制备方法，属于热电复合材料制备技术领域。本发明通过在Bi2Te2.2Se0.8‑SiC基材中掺杂少量CuI，获得的热电材料在200～300℃的温度范围内ZT值稳定在0.85左右，且Cu/I掺杂表现出自调节行为；掺杂浓度的增加提高了高温下的电导率并有效抑制了本征激发；此外，由于“原位”CuI纳米析出物充当声子散射中心，晶格热导率大大降低，双极热导率降低60％以上，提高了材料的最高使用温度，从而大大提高了转换效率。且本发明制备得到的材料适用于和传统铸锭进行分段组合，器件ZT值高达0.9～1.0左右，并且在300～573K范围内的转换效率达到9.2％。
Thermoelectric nano composite material and preparation method thereof
一种热电纳米复合材料及其制备方法
LIU FENGMING (Autor:in) / LI JINGFENG (Autor:in) / CAI BOWEN (Autor:in)
27.12.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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