Effects of Composition Changes, Substitutions, and Hydrostatic Pressure on the Ionic Conductivity in Lithium Aluminosilicate and Related Beta‐Eucryptite Materials

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Abstract
The effects of selected compositional changes, substitutions, and hydrostatic pressure on the lithium ion conductivity in lithium aluminosilicate solid electrolytes which exhibit the β‐eucryptite structure when in crystalline form have been determined. Substitutions of for and for in glass and glass‐ceramic materials have no significant effect on the ionic conductivity; however, the addition of and substitution of for increases the conductivity. The highest conductivities [ at 500°C] were obtained for glasses with enhanced concentrations (e.g., ), and for glass‐ceramics with both enhanced concentrations and substitutions (e.g., ). Generally, the glass‐ceramics have a lower conductivity than the glass except for certain substituted glass‐ceramics where this trend is reversed. Hydrostatic pressure experiments (to 2.0 GPa) on various glasses and glass‐ceramics showed only slight variations in the ionic conductivity characteristics. All of the results can be consistently interpreted in terms of the existence of glass‐crystalline interfacial layers in the glass‐ceramics. Ionic conductivity data are also presented on single crystals.

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