Promising high-conductivity Li1.5Al0.5Ge1.5(PO4)3 solid electrolytes: the effect of crystallization temperature on the microstructure and transport properties
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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.
KeywordsAll-solid-state lithium batteries Glass-ceramics NASICON-type structure Li1.5Al0.5Ge1.5(PO4)3 Ionic conductivities Raman spectroscopy
Crystallization kinetics researches are performed within the framework of the budgetary plans of the Institute of High Temperature Electrochemistry. The characterization of materials was carried out at the Shared Access Centre “Composition of Compounds” of the Institute of High Temperature Electrochemistry of the Ural Branch of the RAS, Yekaterinburg, Russian Federation .
The reported study was funded by the Russian Science Foundation according to the research project no. 18-73-00099.
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Conflict of interest
The authors declare that there are no conflicts to declare.
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