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Engineering Thermal Conductivity for Balancing Between Reliability and Performance of Bulk Thermoelectric Generators

机译：工程导热系数，用于平衡大容量热电发电机的可靠性和性能

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摘要

The nanostructuring approach has significantly contributed to the improving of thermoelectric figure-of-merit (ZT) by reducing lattice thermal conductivity. Even though it is an effective method to enhance ZT, the drastically lowered thermal conductivity in some cases can cause thermomechanical issues leading to decreased reliability of thermoelectric generators. Here, an engineering thermal conductivity (kappa(eng)) is defined as a minimum allowable thermal conductivity of a thermoelectric material in a module, and is evaluated to avoid thermomechanical failure and thermoelectric degradation of a device. Additionally, there is dilemma of determining thermoelectric leg length: a shorter leg is desired for higher W kg(-1), W cm(-3), and W $(-1), but it raises the thermomechanical vulnerability issue. By considering a balance between the thermoelectric performance and thermomechanical reliability issues, it is discussed how to improve device reliability of thermoelectric generators and the engineering thermal conductivity of thermoelectric materials.
机译：纳米结构化方法通过降低晶格导热系数，极大地促进了热电品质因数（ZT）的提高。尽管这是提高ZT的有效方法，但在某些情况下，导热系数的急剧降低可能会引起热机械问题，从而导致热电发电机的可靠性下降。在此，将工程热导率（kappa（eng））定义为模块中热电材料的最小允许热导率，并对其进行评估以避免器件的热机械故障和热电降解。另外，确定热电腿的长度存在两难选择：对于较高的W kg（-1），W cm（-3）和W $（-1），需要较短的腿，但这会引发热机械脆弱性问题。通过考虑热电性能和热机械可靠性问题之间的平衡，讨论了如何提高热电发电机的设备可靠性和热电材料的工程热导率。

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  • 来源
    《Advanced Functional Materials》 |2016年第21期|3678-3686|共9页
  • 作者

    Kim Hee Seok; Wang Tianbao; Liu Weishu; Ren Zhifeng;

  • 作者单位

    Univ Houston, Dept Phys, 3201 Cullen Blvd, Houston, TX 77204 USA|Univ Houston, Texas Ctr Superconduct TcSUH, 3201 Cullen Blvd, Houston, TX 77204 USA;

    Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China;

    Univ Houston, Dept Phys, 3201 Cullen Blvd, Houston, TX 77204 USA|Univ Houston, Texas Ctr Superconduct TcSUH, 3201 Cullen Blvd, Houston, TX 77204 USA;

    Univ Houston, Dept Phys, 3201 Cullen Blvd, Houston, TX 77204 USA|Univ Houston, Texas Ctr Superconduct TcSUH, 3201 Cullen Blvd, Houston, TX 77204 USA;

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