SOLID ELECTROLYTE MATERIAL FOR CO2 GAS SENSOR AND PRODUCTION OF SOLID ELECTROLYTE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To enhance the mechanical strength, durability, humidity resistance and electrochemical stability of a solid electrolyte type CO₂ gas sensor by using composite carbonate containing lithium aluminate as aggregate as a solid electrolyte material. ;SOLUTION: A solid electrolyte material used in a solid electrolyte type CO₂ gas sensor is constituted of composite carbonate containing lithium aluminate (LiAlO₂) and produced by mixing 0.5-15wt.% of Li₃PO₄ with Li₂CO₃ to melt the resulting mixture at 700-770°C under stirring and solidifying the same to grind the solidified matter to form a powder which is, in turn, mixed with LiAlO₂ (powder or fiber) so that the mixing amt. of LiAlO₂ is 1-60% by wt. of the whole and molding the obtained mixture before sintering the same at 670-720°C. If the CO₂ gas sensor is constituted by using this solid electrolyte material, the reliability of the sensor is enhanced.;COPYRIGHT: (C)1997,JPO