Method for enhancement of thermoelectric efficiency by the preparation of nano thermoelectric powder with core-shell structure
A core-shell structure and nano-powder technology, applied in the manufacture/processing of thermoelectric devices, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as increasing ZT value
Inactive Publication Date: 2014-07-30
LG INNOTEK CO LTD
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Problems solved by technology
[0009] However, the type of insertion of simple nanostructures into bulk-type thermoelectric elements also affects the reduction of conductivity σ, which is not enough to effectively increase the ZT value
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[0034] The present invention provides nano thermoelectric powder with a core-shell structure, which includes a coating on the surface of the nano powder, and by preparing the nano thermoelectric powder with the core-shell structure, the present invention can provide a thermoelectric element with enhanced thermoelectric efficiency.
[0035] The efficiency of a thermoelectric material can be defined by the following equation expressing the dimensionless ZT value.
[0036] ZT=S 2 σT / κ(S: Seebeck coefficient, σ: electrical conductivity, κ: thermal conductivity)
[0037] The ZT value is directly proportional to electrical conductivity and Seebeck coefficient, and inversely proportional to thermal conductivity.
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Abstract
Provided is nano thermoelectric powder with a core-shell structure. Specifically, the nano thermoelectric powder of the core-shell structure of the present invention forms coating layer on the surface of nano powder prior to sintering of the nano powder. An advantage of some aspects of the present invention is that it provides thermoelectric elements having reduced thermal conductivity and enhanced thermoelectric efficiency without affecting electrical conductivity using the nano thermoelectric powder with the core-shell structure.
Description
technical field [0001] The present disclosure relates to a nano thermoelectric powder having a core-shell structure capable of enhancing thermoelectric efficiency and a thermoelectric element using the nano thermoelectric powder. Background technique [0002] In general, a thermoelectric material is an energy conversion material that generates electrical energy when a temperature difference is given between both ends of the material and a temperature difference is generated between the two ends of the material when electrical energy is given to the material. [0003] The efficiency of a thermoelectric material can be defined by the following equation representing a dimensionless ZT value. [0004] ZT=S 2 σT / κ(S: Seebeck coefficient, σ: electrical conductivity, κ: thermal conductivity) [0005] The ZT value is directly proportional to electrical conductivity and Seebeck coefficient, and inversely proportional to thermal conductivity. [0006] Recently, in order to increase...
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IPC IPC(8): H01L35/12H01L35/34H10N10/85H10N10/857B22F1/054B22F1/17H10N10/01
CPCC22C1/10B22F2998/10B22F2999/00B82Y30/00B22F1/054B22F1/17H10N10/852H10N10/01B22F9/24B22F1/16H10N10/85H10N10/857B22F9/06B22F9/04
Inventor 李钟旼
Owner LG INNOTEK CO LTD