Author/Authors :
kazazi, mahdi malayer university - faculty of engineering - department of materials engineering, ايران , illbeigi, mohammad arak university - faculty of engineering - department of chemical engineering, ايران , fazlali, alireza arak university - faculty of engineering - department of chemical engineering, ايران , mohammadi, amir. h. université laval, québec (qc) - faculté des sciences et de génie - département de génie des mines, de la métallurgie et des matériaux, Canada , mohammadi, amir. h. institut de recherche en génie chimique et pétrolier (irgcp), France , mohammadi, amir. h. university of kwazulu-natal, howard college campus - school of engineering - thermodynamics research unit, South Africa
Abstract :
A super ionic conducting lithium aluminum germanium phosphate (LAGP) glass-ceramic with a formula of Li_1.5Al_0.5Ge_1.5(PO_4)_3 was synthesized by melt-quenching method and subsequent crystallization at 850 °C for 8 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 LiGe_2(PO_4)_3 as the dominant phase with a little impurity phase of GeO_2. SEM images revealed the presence of large LAGP crystals. A high conductivity of 5.36×10^-3 S/cm at 25 °C was obtained for the pristine LAGP glass-ceramic. Furthermore, the stability of the LAGP was examined in 1 M LiNO_3 aqueous solution by XRD and conductivity measurements. XRD pattern and ionic conductivities of the immersed LAGP show no changes compare to the pristine LAGP and indicate the high ionic conductivity and good stability in LiNO_3 aqueous electrolyte and these two properties are essential for lithium-protective layer in aqueous lithium-air batteries.
Keywords :
NASICON , type glass ceramic , Lithium , air battery , LiNO_3 electrolyte , Stability
