Composite thermoelectric material and preparing method thereof

A technology of thermoelectric materials and thermoelectricity, which is applied in the direction of thermoelectric device node lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problems of small phase interface, size, and size difficult to control, and achieve thermal conductivity reduction and thermoelectricity optimization. The effect of increasing the value ZT and suppressing the thermal conductivity
CN104733604AActive Publication Date: 2015-06-24SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
Publication Date
2015-06-24

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Abstract

The invention discloses a composite thermoelectric material and the preparing method thereof. The composite thermoelectric material comprises a solid thermoelectric material and oxidized graphene. The preparing method comprises the steps of mixing solid thermoelectric material powder and oxidized graphene solution, conducting ultrasonic treatment, and obtaining the composite thermoelectric material through suction filtration, drying, grinding and sintering. Compared with an N-type solid matrix thermoelectric material, the composite thermoelectric material has the advantages that heat conductivity is reduced greatly, electrical transport property is basically unchanged, and then thermoelectricity merit figure ZT is increased by over 25%; compared with a P-type solid matrix thermoelectric material, the composite thermoelectric material has the advantages that conductivity and Seebeck coefficient are both improved, heat conductivity is effectively restrained, and thermoelectricity merit figure ZT is increased by over 50%; meanwhile, compared with the N-type solid matrix thermoelectric material and the P-type solid matrix thermoelectric material, the composite thermoelectric material containing oxidized graphene has the advantage that ZT can be increased greatly within the whole temperature range.
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Description

technical field

[0001] The invention belongs to the field of thermoelectric materials, and in particular relates to a composite solid thermoelectric material and a preparation method thereof. Background technique

[0002] A thermoelectric material is a material that uses the transport of carriers in a solid to achieve mutual conversion between thermal energy and electrical energy. It has the advantages of small size, no noise, zero pollution discharge, etc., so it has broad application prospects. American scientist Slack proposed that the material has the high electronic conductivity of crystals and the low thermal conductivity of glass, which can optimize its thermoelectric performance. The thermoelectric performance is usually evaluated by the dimensionless thermoelectric figure of merit ZT, where ZT=S 2 Tσ / κ, S is the thermoelectric potential or Seebeck coefficient, T is the absolute temperature, σ is the electrical conductivity, and κ is the thermal conductivity. Typi...

Claims

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