Promising high-conductivity Li1.5Al0.5Ge1.5(PO4)3 solid electrolytes: the effect of crystallization temperature on the microstructure and transport properties

• DOI: 10.1007/s11581-019-03021-5
• Publication Date: 2019-05-17T15:42:42Z
• Authors: S. V. Pershina; A. A. Pankratov; E. G. Vovkotrub; B. D. Antonov
• Keywords: Fast ion conductor

High-conductivity NASICON-type solid electrolytes of Li1.5Al0.5Ge1.5(PO4)3 composition have been obtained through glass crystallization. Thermal behavior of the precursor glass has been investigated; glass transition and crystallization temperatures have been determined by DSC. The influence of glass crystallization temperature (750, 800, 820, and 850 °C) on the phase composition, microstructure, molecular structure, and ionic conductivity of Li1.5Al0.5Ge1.5(PO4)3 glass-ceramics has been studied. It was found that the optimum crystallization temperature for obtaining an electrolyte with the highest conductivity (0.39 mS cm−1 at 25 °C) is 820 °C.