Solid Electrolytes:Alkali-Ion Transport in Skeleton Structures.

摘要

A new three-dimensional K(+)-ion conductor, K(1.9)Mg(0.95)Si(1.05)O(4) has been identified. Its resistivity at 300C is 28 ohm-cm, less than one-fourth the value for the best potassium beta-alumina. More definitive measurements have been made of the Na(+)-ion transport in Na3Zr2Si2PO12 (NASICON). Its resistivity at 300C is 3 ohm-cm, compared with 4 ohm-cm for beta double prime-alumina. Moisture tests have shown that NASICON is insensitive to water vapor. Static tests in molten Na2S4 for 10 days at 400C indicate chemical stability; similar tests in molten Na and dynamic tests in a Na-Na cell are in progress. Conclusive evaluation of stability awaits the preparation of additional test specimens.