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Detailed Program
Paper Number : FU-I01
Time Frame : 13:30~13:55
Presentation Date : Thurseday, 27, November
Session Name : Fuel cells and batteries
Session Chair 1# : Hyung-Tae Lim
Session Chair 2# : Naoaki Yabuuchi
Pure Mg2+ Ion Conducting Solid Electrolyte Having NASICON-type Structure
Nobuhito IMANAKA
Osaka University
Divalent Mg2+ ion highly-conducting solid electrolytes having the NASICON-type structure, (MgxHf1-x)4/4-2xNb(PO4)3 solids, were developed and their ion conducting properties were studied. Among the samples, the (Mg0.1Hf0.9)4/3.8Nb(PO4)3 solid showed the highest ion conductivity of 1.2 ¡¿ 10−4 S/cm at 600 ¡ÆC and the conductivities below 400 ¡ÆC were higher than those for the Mg 2+ ion conducting Mg0.7(Zr0.85Nb0.15)4P6O24 solid which has been reported to be the solid showing the highest Mg2+ ion conductivity. From dc and ac conductivity measurements in a wide range of oxygen partial pressure region, it was clarified that the present solid possess the cationic transference number over 0.99. Moreover, since the quantitative Mg2+ ion migration in the (Mg0.1Hf0.9)4/3.8Nb(PO4)3 solid was successfully demonstrated not only by the dc electrolysis method but also by the modified Tubandt electrolysis method, the present NASICON-type (Mg0.1Hf0.9)4/3.8Nb(PO4)3 solid is demonstrated to be the novel type of pure Mg2+ ion conducting solid electrolyte with a reasonably high ion conductivity.
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