Toward 500 Wh Kg in Specific Energy with Ultrahigh Areal Capacity All-Solid-State Lithium-Sulfur Batteries.

All-solid-state lithium-sulfur (Li-S) batteries are considered a top choice to achieve 500 Wh kg in specific energy while meeting safety requirements for applications such as future electric aviation. A key bottleneck is that S as the active material lacks sufficient conductivities, making it difficult for effective utilization especially in the solid-state. In addition, to achieve high cell-level specific energy, not only a high-utilization S cathode is required, but also the excess weight needs to be balanced and minimized from the solid-state electrolyte (SSE) separator and the Li metal anode.