Method of Production of a Solid Electrolyte,
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA
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The invention concerns a method of production of a sodium, polyaluminate electrolyte, which can be used in electrochemical converters and power sources. Aluminum hydroxide is mixed with a water solution of a thermally unstable sodium salt, such as the carbonate. The mixture is roasted at 1400C. The powder without binder at pressures up to 6 tonssq cm and annealed at 1700-1900C. The resulting solid electrolyte has up to 1.5 times the conductivity of material produced by fusion of mechanical mixtures. An alternate method includes addition of lithium or magnesium flouride or carbonate, which gives a material with 2-3 times the conductivity of a similar ceramic, produced from powders synthesized by mechanical mixing.
- Ceramics, Refractories and Glass