Garnet-Type Li_7La_3Zr_2O_(12)/Lithium Metal Interface: Microstructure and Electrochemical Properties in Solid State Batteries

摘要

All-solid-state lithium ion batteries may overcome safety issues in future energy storage systems, when a non-flammable solid electrolyte instead of a liquid electrolyte is applied. Garnet-type Li_7La_3Zr_2O_(12) (LLZO) is an encouraging choice due to its high Li~+ conductivity and its chemical stability against lithium metal. However, low-resistance LLZO/Li interfaces are deteriorated by incomplete adhesion of lithium metal onto LLZO and by surface contamination. The resulting inhomogeneous distribution of contact areas may be more prone to dendrite formation. Previous studies indicate that LLZO/Li interface quality is significantly improved by metallic buffer layers.