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

概要

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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 (La_0.85Sr_0.15)_0.85MnO_3 (LSM) slurry and firing at 1200℃. The porous ASEC was then pressed at a temperature of 1500℃. 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 (La_0.75Cao_0.30) Cr_0.95O_3 (LCC) bulks were bonded with the ASEC as an intermediate material at 1500℃. The contact resistances at 1000℃ in air between the LSM and the ASEC, and between the LCC and the ASEC were 1.1 mΩcm^2 and 4.2mΩcm^2, respectively, at the bonding condition of 98 kPa. 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.
社団法人日本セラミックス協会の論文
2003-04-01