Journal
JOURNAL OF THE KOREAN CERAMIC SOCIETY
Volume 45, Issue 12, Pages 760-765Publisher
KOREAN CERAMIC SOC
DOI: 10.4191/kcers.2008.45.1.760
Keywords
Solid oxide fuel cells; Electrolyte; Scandia stabilized zirocnia; Sintering additions; Densification; Electrical conductivity
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Funding
- NEDO, Japan, Advanced Ceramic Reactor Project
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In this study, the effects of small amounts (<= 3 mol%) of Li doping on the sintering characteristics and electrochemical performance of (ZrO2)(0.89)(SCO (1.5))(0.1)(CeO2)(0).(01) (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of 1400 degrees C to 1200 degrees C. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450 degrees C. At elevated temperatures of 450 similar to 750 degrees C, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells.
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