Abstract
Li + is one of several monovalent cations known to completely replace Na + in Na + beta alumina. The exchange occurs readily to approximately 50% producing a physically stable Li + solid electrolyte having a conductivity of approximately 10 −3 (Ωcm) −1 at 25°C. The Li + transport number through Li +-Ni + beta alumina is nearly 1 for compositions having Li +/Na + greater than 1. Li + ions migrate through the solid electrolyte lattice without significantly altering its Na + content. This paper discusses our work examining ionic equilibrium, Li + transport, ionic conductivity, and stability of Li +-Na + beta alumina. The extraordinary preferential Na + occupation of the beta alumina structure even in the presence of high Li + activity is discussed and similar behavior predicted for another beta alumina composition.
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