4.6 Article

Improved Li-Ion conduction by ion-conductor Li1.5Al0.5Ge1.5(PO4)3 additive in garnet type Li7La3Zr2O12 solid electrolytes

Journal

MATERIALS CHEMISTRY AND PHYSICS
Volume 281, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.125910

Keywords

Li7La3Zr2O12; Li1.5Al0.5Ge1.5(PO4)(3); Densification; Activation energy

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In this study, Li1.5Al0.5Ge1.5(PO4)(3) (LAGP) was introduced as a sintering aid into the garnet type Li7La3Zr2O12 (LLZO) structure. The addition of LAGP improved the densification and electrochemical performance of LLZO, but also led to the formation of open pores and cracking. The optimized LLZO sample with 1 wt % LAGP showed the best electrolytic properties and a lower activation energy, thanks to the continuous ion-conductive pathway facilitated by LAGP.
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 x 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 inter-granular ion conduction.

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