Solid-state lithium-ion battery employing LiBH-ZrO as a solid-state electrolyte.

LiBH has been extensively investigated as a solid-state electrolyte for Li-ion battery applications. The crucial point is that the operating temperature for this material needs to be above 120 °C, due to its low ionic conductivity at room temperature. In this study, the Li-ion conductivity of LiBH has been enhanced by mixing it with ZrO. The optimal composition of the mixture was found to be 37 v/v% of ZrO, exhibiting a Li-ion conductivity of 3.32 × 10 S cm at 60 °C. The electrochemical stability window of the mixture (2.4 V Li/Li) is slightly higher compared to that of pure LiBH. The optimized mixture was used as an electrolyte in TiS/Li all-solid-state Li-ion batteries. Two batteries were successfully cycled at 60 °C. The effect of charging profile was investigated to improve the performance of the battery.