SYNTHESIS AND CHARACTERIZATION OF LLZO SOLID ELECTROLYTE EMPLOYING XRD AND EIS TECHNIQUES

Abstract

Solid electrolytes for lithium batteries are considered as an alternative to face some of the batteries problem applications. Materials such as Li7La3Zr2O12 (LLZO) have shown good Li-ionic conductivity. In this work, LLZO was obtained by sol-gel process. Crystallization was performed at 900°C for 10 hours, the crystallization temperature was reached with a heating rate of 100°C per hour. The obtained phases were identified by X-ray diffraction (XRD). The ionic conductivity was measured by electrochemical impedance spectroscopy (EIS) with ± 10 mV amplitude and frequencies 100 kHz to 10 mHz. The obtained phase belongs to the cubic crystal system with the space group Ia3d which has promising properties to be employed as a solid electrolyte. Unlike the tetragonal phase, the cubic phase has better stability and higher ionic conductivity.