Garnet-based electrolytes for advanced all-solid-state lithium battery

All-solid-state lithium batteries are emerging as one of the key energy storage technologies due to their high theoretical energy density compared to conventional lithium- and sodium-ion-based batteries. The present lithium batteries such as Li-S batteries suffer from Li dendrite formation and capacity decay due to polysulfide dissolution effect – a typical problem with liquid organic electrolytes. Solid-state (ceramic) electrolytes are promising to prevent Li dendrite growth and polysulfide dissolution. Among the different ceramic electrolytes, garnet-type structure solid inorganic electrolytes are very promising because of their high lithium-ion conductivity and stability with elemental Li and humidity. However, high interfacial resistance with the electrode is the major bottleneck for practical use of ceramic electrolytes. In this talk, we will present strategies to solve the interfacial resistance issue in garnet-based electrolytes. Elemental doping, solution-based interface engineering, and hybrid polymer-ceramic electrolyte approach will be discussed. Methods to improve lithium battery electrodes such as sulfur with minimal polysulfide shuttle effect will also be introduced.