Ultrafast-sintered self-standing LLZO membranes for high energy density lithium-garnet solid-state batteries

Toward building non-flammable lithium-ion batteries with high en-ergy density, Li7La3Zr2O12 (LLZO) has recently attracted consider-able attention as a compelling solid-state lithium-ion electrolyte. Unlike other lithium-ion soft solid conductors such as those based on sulfides, LLZO can be manufactured with a bilayer dense-porous microstructure, which prevents the issues of dynamic volume change of the anode and the formation of voids at the lithium/ solid-state electrolyte interface during cycling. Here, we report a facile, ultrafast sintering methodology for the fabrication of LLZO solid-state electrolytes in the form of self-standing bilayer dense -porous LLZO membranes. The thicknesses of the dense and porous layers are approximately 8 and 55 mm, respectively, which hypothet-ically allows them to achieve the high gravimetric and volumetric en-ergy densities of lithium-garnet batteries of 218 Wh kg -1 and 769 Wh L-1, respectively. Electrochemical measurements confirm that the LLZO membranes possess a high critical current density up to 1.7 mA cm -2.

Automated summary

A facile and ultrafast sintering methodology has been developed for the fabrication of self-standing bilayer dense-porous LLZO membranes as solid-state electrolytes. The LLZO membranes show high critical current density, making them promising for non-flammable lithium-ion batteries with high energy density.