Bismuth-telluride-based thermoelectric element and preparation method thereof

Abstract

The invention discloses a bismuth-telluride-based thermoelectric element and a preparation method thereof. The bismuth-telluride-based thermoelectric element comprises an electrode layer, a blocking layer and a bismuth-telluride-based thermoelectric layer, wherein the blocking layer is positioned between the electrode layer and the bismuth-telluride-based thermoelectric layer; and the blocking layer is made of metallic bismuth or alloy of the metallic bismuth and other metal. The preparation method of the bismuth-telluride-based thermoelectric element comprises the following steps of: respectively weighing a bismuth-telluride-based thermoelectric layer material, a blocking layer material and an electrode layer material; putting the bismuth-telluride-based thermoelectric layer material, the blocking layer material and the electrode layer material into a graphite mold in sequence according to the sequence of the bismuth-telluride-based thermoelectric layer material, the blocking layer material and the electrode layer material; and carrying out hot-pressing sintering in vacuum. In the bismuth-telluride-based thermoelectric element provided by the invention, the combination among all interfaces is good, no cracks and obvious diffusion phenomenon at the interfaces exist, the interface resistance is low and the long-time heat fatigue test can be born. In addition, the preparation method disclosed by the invention has the advantages of simple process, good reliability, low manufacturing cost, no need for special equipment and suitability for on-scale production and the like.

Description

technical field [0001] The invention relates to a bismuth telluride-based thermoelectric element and a preparation method thereof, belonging to the technical field of thermoelectric elements. Background technique [0002] Thermoelectric power generation is a fully static direct power generation method that uses semiconductor thermoelectric conversion materials to convert heat energy (temperature difference) into electrical energy. It is an environmentally friendly green energy technology that is of great significance for alleviating and solving the current growing energy pressure and environmental pollution. The thermoelectric power generation system has the characteristics of compact structure, reliable performance, no noise, no wear, no leakage during operation, good mobility, and is suitable for low energy density recycling. It is especially suitable for recycling industrial waste heat and automobile exhaust waste heat. In 2005, the U.S. Department of Energy launched a re...

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Problems solved by technology

However, the preparation of bismuth telluride devices by this technology has the following two disadvantages: 1) the process parameters are difficult to control, the metal molybdenum barrier layer and the aluminum electrode are sprayed by plasma, the spraying temperature is too high, and aluminum and molybdenum are easily oxidized during the spraying process; 2) The operating cost is high, the plasma spraying equipment is expensive, and a large amount of aluminum and molybdenum will be wasted during the operation, and the cost is high

Chinese patent CN101409324A also provides a method of using arc spraying to realize the combination of aluminum electrodes, molybdenum barrier layers and materials, but there are also the same problems as plasma spraying, that is, the process is complicated and the cost is too high

[0005] In view of the fact that bismuth telluride-based power generation devices prepared by soldering methods are limited by the use temperature, and devices prepared by plasma spraying and arc spraying methods have high costs and limited large-scale applications, etc., there is an urgent need in this field Research and development of a bismuth telluride-based thermoelectric element that can not only increase the operating temperature of bismuth telluride-based power generation devices, but also reduce the production cost and its preparation method

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