Reduction of Electrical Contact Resistance between Components Solid Oxide Fuel Cell

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  • 固体電解質型燃料電池構成部材間の電気接触抵抗の低減
  • Reduction of Electrical Contact Resistance between Components of Solid Oxide Fuel Cells

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Abstract

Aiming at lowering contact resistance between SOFC components, we produced an Air-Side Electrical Connector(ASEC) which deforms easily under compressive load at high temperature. The ASEC was prepared by soaking a cloth of a carbon fiber with a (La0.85Sr0.15)0.85MnO3(LSM) slurry and firing at 1200°C. The porous ASEC was then pressed at a temperature of 1500°C. It deformed easily, and its thickness changed to be 38%, 46%, and 58% of the pre-deformed one under a stress of 98 kPa, 49 kPa, and 20 kPa, respectively. Dense LSM bulks or (La0.75Ca0.30)Cr0.95O3 (LCC) bulks were bonded with the ASEC as an intermediate material at 1500°C. The contact resistances at 1000°C in air between the LSM and the ASEC, and between the LCC and the ASEC were 1.1mΩcm2 and 4.2mΩcm2, respectively, at the bonding condition of 98kPa. The difference was attributed to the formation of a new perovskite phase which has high electrical resistance at the interface between the LCC and the ASEC. However, the estimated I-R drop at the contact of LSM/LCC under the cell current density of 0.3 A cm-2 was 4 mV, an efficiently low value for practical use.

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