Electrochemical Activation of LiGaO: Implications for Ga-Doped Garnet Solid Electrolytes in Li-Metal Batteries.

Ga-doped LiLaZrO garnet solid electrolytes exhibit the highest Li-ion conductivities among the oxide-type garnet-structured solid electrolytes, but instabilities toward Li metal hamper their practical application. The instabilities have been assigned to direct chemical reactions between LiGaO coexisting phases and Li metal by several groups previously. Yet, the understanding of the role of LiGaO in the electrochemical cell and its electrochemical properties is still lacking.