Bulk-Type Lithium Metal Secondary Battery with Indium Thin Layer at Interface between Li Electrode and Li₂S-P₂S₅ Solid Electrolyte

Abstract

To enhance a cyclability and a rate capability in bulk-type solid-state cells using a lithium metal electrode, an indium thin layer prepared by vacuum-evaporation was inserted at the interface between a lithium electrode and an Li₂S-P₂S₅ solid electrolyte layer. The Li/Li₄Ti₅O₁₂ cells using indium thin film were charged and discharged for 120 cycles reversibly and worked at the high current density of 1.3 mA cm⁻². Inserting lithium-alloy thin layer at the interface between the lithium electrode and the solid electrolyte layer brought about a good cyclability and a high rate capability for the all-solid-state lithium metal cells because of the formation and retention of intimate contacts at the interface. The obtained results are useful for achieving bulk-type solid-state lithium batteries with high power and energy densities.