Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Study on the Suitability of Heat Source for Thermoelectric Cells Using Porous Iron Powder

다공성 철 분말을 이용한 열전지용 열원 적합성 연구

  • Kim, Ji Youn (Defense Materials/Energy Technology Center, Agency of Defense Development) ;
  • Yoon, Hyun Ki (Defense Materials/Energy Technology Center, Agency of Defense Development) ;
  • Im, Chae Nam (Defense Materials/Energy Technology Center, Agency of Defense Development) ;
  • Cho, Jang-Hyeon (Defense Materials/Energy Technology Center, Agency of Defense Development)
  • 김지연 (국방과학연구소 국방소재/에너지기술센터) ;
  • 윤현기 (국방과학연구소 국방소재/에너지기술센터) ;
  • 임채남 (국방과학연구소 국방소재/에너지기술센터) ;
  • 조장현 (국방과학연구소 국방소재/에너지기술센터)
  • Received : 2022.03.23
  • Accepted : 2022.04.21
  • Published : 2022.07.01
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Abstract

Thermal batteries are specialized as primary reserve batteries that operate when the internal heat source is ignited and the produced heat (450~550℃) melts the initially insulating salt into highly conductive eutectic electrolyte. The heat source is composed of Fe powder and KClO4 with different mass ratios and is inserted in-between the cells (stacks) to allow homogeneous heat transfer and ensure complete melting of the electrolyte. An ideal heat source has following criteria to satisfy: sufficient mechanical durability for stacking, appropriate heat calories, ease of combustion by an igniter, stable combustion rate, and modest peak temperature. To satisfy the aforementioned requirements, Fe powder must have high surface area and porosity to increase the reaction rate. Herein, the hydrothermal and spray drying synthesis techniques for Fe powder samples are employed to investigate the physicochemical properties of Fe powder samples and their applicability as a heat source constituent. The direct comparison with the state-of-the-art Fe powder is made to confirm the validity of synthesized products. Finally, the actual batteries were made with the synthesized iron powder samples to examine their performances during the battery operation.

Keywords

Acknowledgement

본 연구는 방위사업청 핵심기술 연구개발 예산으로 수행되었다.

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