Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Development of LSM-Coated Crofer Mesh for Current Collectors in Solid Oxide Fuel Cells

LSM이 코팅된 고체산화물 연료전지용 Crofer Mesh 집전체 개발

  • Baek, Joo-Yul (School of Advanced Material Engineering, Yonsei University) ;
  • Park, Seok-Joo (Fuel Cell Research Center, Korea Institute of Energy Research) ;
  • Lee, Seung-Bok (Fuel Cell Research Center, Korea Institute of Energy Research) ;
  • Lee, Jong-Won (Fuel Cell Research Center, Korea Institute of Energy Research) ;
  • Lim, Tak-Hyoung (Fuel Cell Research Center, Korea Institute of Energy Research) ;
  • Song, Rak-Hyun (Fuel Cell Research Center, Korea Institute of Energy Research) ;
  • Kim, Kwang-Bum (School of Advanced Material Engineering, Yonsei University) ;
  • Shin, Dong-Ryul (Fuel Cell Research Center, Korea Institute of Energy Research)
  • 백주열 (연세대학교 신소재공학과) ;
  • 박석주 (한국에너지기술연구원 연료전지연구단) ;
  • 이승복 (한국에너지기술연구원 연료전지연구단) ;
  • 이종원 (한국에너지기술연구원 연료전지연구단) ;
  • 임탁형 (한국에너지기술연구원 연료전지연구단) ;
  • 송락현 (한국에너지기술연구원 연료전지연구단) ;
  • 김광범 (연세대학교 신소재공학과) ;
  • 신동열 (한국에너지기술연구원 연료전지연구단)
  • Received : 2010.09.10
  • Accepted : 2010.10.10
  • Published : 2010.11.30
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Abstract

A Crofer 22 APU mesh coated with a conductive ceramic material was developed as an alternative cathode current collector to Ag-based materials for solid oxide fuel cells. $(La_{0.80}Sr_{0.20})_{0.98}MnO_3$ (LSM) layer was deposited onto the Crofer mesh using a spray-coating technique, in an attempt to mitigate the degradation of electrical properties due to surface oxidation at high temperatures. The oxidation experiments at $800^{\circ}C$ in air indicated that the areaspecific resistance (ASR) of the LSM-coated Crofer mesh was strongly dependent on the wire diameter and the contact morphology between mesh and cell. In addition, the post-heat-treatment in $H_2/N_2$ resulted in a reduced thickness of Cr-containing oxide scales at the interface between Crofer mesh and LSM layer, leading to a decreased ASR.

본 연구에서는 고체산화물 연료전지의 공기극 집전체로 사용되고 있는 고가의 Ag 소재를 대체하고자 전도성 세라믹이 코팅된 mesh 형태의 Crofer 22 APU 집전체를 개발하였다. 고전자전도성의 $(La_{0.80}Sr_{0.20})_{0.98}MnO_3$ (LSM)을 습식 스프레이법으로 코팅하여 고온 산화 및 전기적 특성의 열화를 억제하고자 하였다. $800^{\circ}C$의 산화 실험 결과에 의하면 LSM이 코팅된 Crofer mesh의 면저항(area-specific resistance)은 mesh의 제작에 사용된 와이어 지름과 접촉 부위의 형상등 실제 접촉점의 수 및 면적을 좌우하는 mesh의 특성에 의해 좌우되었다. 또한 LSM 코팅 후 $H_2/N_2$ 분위기에서의 열처리를 통해 Crofer mesh와 LSM 코팅층 계면에서의 Cr 함유 산화물의 형성을 효과적으로 억제하여 전기적 특성의 열화를 억제할 수 있다.

Keywords

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