Method for producing sodium-beta-alumina solid electrolytes

Details Method for producing sodium-beta-alumina solid electrolytes Method for producing sodium-beta-alumina solid electrolytes

1975-07-09

1976-05-25

Walton, Donald L.

Batteries: thermoelectric and photoelectric

Thermoelectric

Radiation pyrometer

264 61, 264 66, H01M 604, C04B 3544

Patent

active

039590224

ABSTRACT:
An improved method is disclosed for producing a solid sodium-beta-alumina electrolyte, characterized by the step of mixing the sodium-beta-alumina powder -- prior to sintering -- with a sodium-aluminum oxide additive in which the atom ratio of sodium to aluminum is 0.54. Consequently, the temperature to which the resulting mixture must be heated to achieve sintering is greatly lowered (i.e., to between 1600.degree. C. and 1700.degree. C) by the presence of a reactive liquid phase, and the resulting sintered product has a greater density and a lower resistivity, and undesirable abnormal grain growth is avoided.

REFERENCES:
patent: 3655845 (1972-04-01), Takewo Chiku
patent: 3895963 (1975-07-01), McGowan et al.
patent: 3896019 (1975-07-01), Mitoff et al.
DeVries et al., Critical Evaluation of the Literature Data on Beta Alumina and Related Phases: I, Phase Equilibria and Characterization of Beta Alumina Phases, Journal of The American Ceramic Society, Vol. 52, No. 7, pp. 364-369.

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