Improved Li-Ion conduction by ion-conductor Li1.5Al0.5Ge1.5(PO4)3 additive in garnet type Li7La3Zr2O12 solid electrolytes
By Dermenci, Kamil Burak
Published in Materials Chemistry and Physics
2022
Abstract
In this study, Li1.5Al0.5Ge1.5(PO4)3 (LAGP) was introduced as a sintering aid up to 4 wt % into the garnet type Li7La3Zr2O12 (LLZO) structure. Results pointed out that increasing LAGP amount improved densification and electrochemical performance comparing with pure LLZO. But, LAGP addition facilitated the open pore formation and cracking occurred eventually. 1 wt % LAGP containing LLZO was optimized as they show the best electrolytic properties with 0.78 mS/cm ionic conductivity and 1.25 × 10−7 S/cm electronic conductivity without suffering from the open pore formation. LAGP added LLZO samples exhibited one of the lowest activation energies around 0.17 eV when compared to the pure LLZO (0.24 eV) as LAGP stayed between LLZO grains and maintain the continuous ion-conductive pathway. Considering all of the findings, the study offers a new approach to obtain bulk type LLZO solid electrolytes with the lowest activation energy thanks to the intergranular ion conduction.