Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Patent
1993-05-14
1995-05-09
Maples, John S.
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
429 30, 252520, H01M 812, C04B 3548
Patent
active
054138809
ABSTRACT:
The present invention relates to an oxygen ion conductor consisting of a composition consisting of (1-x-y)ZrO.sub.2 --xSc.sub.2 O.sub.3 --yAl.sub.2 O.sub.3, and to solid fuel cells employing this ion conductor as the solid electrolyte. In order to obtain more desireable characteristics in the aforementioned composition, it is preferrable to apply limits to the composition such that: 0.05<x+y.ltoreq.0.16 and x>0, y>0, or, alternatively, such that: 0.07.ltoreq.x+.ltoreq.0.13 and 0.005.ltoreq.y.ltoreq.0.02. In the present invention phase transitions occuring during temperature change from room temperature to high temperatures are eliminated and mechanical strength with respect to the heat cycle is increased by adding as a secondary dopant a specific quantity of Al.sub.2 O.sub.3 to a specific ZrO.sub.2 --Sc.sub.2 O.sub.3 system composition which has a high degree of ion conductivity.
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Inozemtsev, M. "Effect of Additions of Impurities on the Electrical Properties of a Solid Oxide Electrolyte", Chemical Abstracts, vol. 83, No. 24, 15 Dec. 1975, Abstract No. 200671v.
Bannister, M. J. et al., The Cubic Tetragonal Equilibrium in the System Zirconia-Scandia at 1800.degree. C.: Effect of Alumina, J. of Materials Science Letters 2 (Oct. 1983) pp. 561-564.
S. P. S. Badwal et al., The Sc.sub.2 O.sub.2 -ZrO.sub.2 -Al.sub.2 O.sub.3 System: Electrical Conductivity and Microstructure, J. of the Australian Ceramic Society, vol. 20, No. 2, 1984, (no month) pp. 28-31.
European Search Report, Dec. 7, 1993 in EP 93 40 1258 with Annex.
Ishii Takao
Iwata Tsunekazu
Tajima Yukimichi
Maples John S.
Nippon Telegraph and Telephone Corporation
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