Beta-alumina solid electrolyte

Details Beta-alumina solid electrolyte Beta-alumina solid electrolyte

1995-03-02

1997-03-18

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Include electrolyte chemically specified and method

429104, 501 51, 501120, 501153, 423600, H01M 618

Patent

active

056121547

ABSTRACT:
A beta-alumina solid electrolyte for use in a sodium-sulfur battery is composed of beta-alumina crystals having a degree of orientation toward the C axis thereof, of 0.2-0.4 and an aspect ratio of 4.0 or less. The beta-alumina solid electrolyte is composed of the beta-alumina crystals having a degree of orientation toward the C axis thereof, of 0.2-0.4 and has such a particle diameter distribution that the average particle diameter is 3 .mu.m or less, the proportion of the particles having a particle diameter of 5 .mu.m or less is 90% or more, and the maximum particle diameter is 300 .mu.m or less. A process for producing a beta-alumina solid electrolyte using an alumina source material, a magnesium source material and a sodium source material, uses a magnesium-aluminum spinel as the magnesium source material and subjects all materials to mixing, granulation, molding and firing to obtain a beta-alumina solid electrolyte without subjecting the materials to calcination. The beta-alumina solid electrolyte has a low electrical resistance and a large strength to internal water pressure and exhibits excellent properties when used as a diaphragm for a sodium-sulfur battery.

REFERENCES:
patent: 4083919 (1978-04-01), Pearlman
patent: 4113928 (1978-09-01), Virkar et al.
patent: 4307138 (1981-12-01), Powers et al.
patent: 4339511 (1982-07-01), Morgan
patent: 4370393 (1983-01-01), Watanabe et al.
patent: 4539276 (1985-09-01), Harbach
"Preparation of .beta."-Al.sub.2 O.sub.3 Pressing by Spray Drying", David W. Johnson et al., Bell Labs, Murray Hill, N.J., Ceramic Bulletin, vol. 58, No. 9 (1979), pp. 849-852 and 855 (Month not avail.).
"Homogenization, Phase Formation, and Sintering of Spray-Dried .beta."-Al.sub.2 O.sub.3 ", Eva M. Vogel et al., Bell Labs, Murray Hill, N.J., Ceramic Bulletin, vol. 60, No. 4 (1981), pp. 494-496 and 500. (Month not avail).
Patent Abstracts of Japan, vol. 15, No. 421 (C-0878), Oct. 1991.

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