Rapid crystallization of Li1.5Al0.5Ge1.5(PO4)3 glass ceramics via ultra-fast high-temperature sintering (UHS)

Lithium aluminum germanium phosphate solid electrolyte is a promising candidate for all-solid-state batteries. The currently available processing techniques based on melting-quenching require a rather lengthy crystallization step lasting up to 8 hours. In this work, the newly emerged ultra-fast high-temperature sintering (UHS) was proposed to achieve in a single step reactive consolidation of powder mixture (GeO2, Al(PO3)(3), LiPO3) and crystallization of the electrolyte within 16 minutes. Samples produced using UHS had a better phase purity, reduced Li loss, and improved ionic conductivity when compared to the counterparts prepared using conventional crystallization at 850 degrees C for 6 h. In fact, specimens prepared by UHS achieved a crystallinity of 90% and ionic conductivity as high as 1.31 x 10(-4) S cm(-1).

Automated summary

In this study, a new ultra-fast high-temperature sintering technique was proposed to achieve reactive consolidation and crystallization of the solid electrolyte in a single step within 16 minutes. Compared to conventional crystallization, the samples produced using this technique exhibited better phase purity, reduced Li loss, and improved ionic conductivity. In fact, the specimens achieved a crystallinity of 90% and an ionic conductivity as high as 1.31 x 10(-4) S cm(-1).