Multi-substituted garnet-type electrolytes for solid-state lithium batteries

Lithium garnets are considered as advanced solid electrolytes for safe and high-energy-density solid-state lithium batteries . A multi-substituted strategy illustrating in this work is substitution of Li by Ga and Zr by Ta/Ba, therefore stabilizing and densifying the cubic lithium garnets thus improving the ionic conductivities . The influence of Ga substitution on garnet phase, microstructure and conductivity of Li 6.7-3x Ga x La 3 Zr 1.55 Ta 0.4 Ba 0.05 O 12 garnets is systematically studied. The developed multi-substituted garnet-type electrolytes demonstrate high ambient-temperature conductivity of 1.02 × 10 -3  S cm -1 . Moreover, the multi-substituted garnet reveals impressive capability of alleviating lithium metal dendrites over 800 h under current of 0.01 mA cm -2 to 0.5 mA cm -2 , promising solid-state battery applications.