Rapid Na+ Transport Pathway and Stable Interface Design Enabling Ultralong Life Solid‐State Sodium Metal Batteries

at 10 C and shows impressive long-cycle stability, retaining 86.2 % of initial capacity over 5000 cycles with an average coulombic efficiency of 99.9 %. Our work presents a high-performance SPCE with intrinsic safety, providing valuable insights for the future design of solid-state SMBs.