Solid-State Lithium-Sulfur (Li-S) batteries are a very promising candidate to achieve safe battery design with high energy density. Among all solid-state electrolyte separators, cubic structural garnet electrolyte (Li₇La₃Zr₂O₁₂ , LLZO) is highly desired due to its relatively high ionic conductivity and air stability. However, the unstable anode/LLZO and sulfur cathode/LLZO interface hindered development of garnet solid-state Li-S batteries. The anode-LLZO interface challenge has been well-resolved by us through a porous-dense(-porous) 3D architecture with evidence of achieving a critical current density of 10 mA/cm 2 at room temperature. Nevertheless, the instability between sulfur cathode and LLZO has not been explored and systematically studied. I will first discuss the charge failure mechanism in solid-state Li-S batteries using LLZO solid electrolyte. I will show how the surface element segregation of LLZO on the sulfur cathode side impacts the charge voltage profile. I will also discuss different strategies on how to overcome the surface element segregation problems that led to a cell failure. With our designed catholyte chemistry, the highest energy density of 223 Wh/kg and 769 Wh/L was obtained. At a deeper level, given the fact that a small amount of catholyte is normally required for batteries using LLZO as a solid electrolyte, it compromises the safety of the solid- state batteries. In the second part of my talk, I will introduce the first up-to-date all- solid-state garnet Li-S batteries that eliminate the need for any liquid components. This work pioneers a design by using Li salt both as an ionic conductive medium and as an adhesive agent. Overall, these works establish new aspects and new approaches towards the design of high-energy-density solid-state Li-S batteries.