Mahdi Kazazi
Mohammad Illbeigi - Department of Chemical Engineering, Arak University
Alireza Fazlali - Department of Chemical Engineering, Arak University
Amir.H. Mohammadi - Institut de Recherche en Génie Chimique et Pétro, Paris Cedex

A conducting lithium aluminum germanium phosphate (LAGP) glass-ceramic with a formula of Li۱.۵Al۰.۵Ge۱.۵(PO۴)۳ was synthesized by melt-quenching method and subsequent crystallization at ۸۵۰ °C for ۸ h. The prepared glass-ceramic was characterized using differential scanning calorimetry (DSC), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and AC impedance techniques. The XRD patterns exhibited the existence of LiGe۲(PO۴)۳ as the dominant phase with a little impurity phase of GeO۲. SEM images revealed the presence of large LAGP crystals. A high conductivity of ۵.۳۶×۱۰-۳ S/cm at ۲۵ °C was obtained for the pristine LAGP. Furthermore, the stability of the LAGP was examined in ۱ M LiNO۳ aqueous solution by XRD and conductivity measurements. XRD pattern and ionic conductivities of the immersed LAGP showed no change as compared with the pristine LAGP, showing the good stability in aqueous electrolyte and great potential for aqueous lithium-air battery application.

NASICON, type glass ceramic, Lithium, air battery, LiNO۳ electrolyte, Stability