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 (ω cm)-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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