Accessing Four‐Sodium Storage in Na x V 2 (PO 4 ) 3 (1≤ x ≤5) Cathodes via Precise Chemical Pre‐Sodiation Toward High‐Energy and Long‐Life Anode‐Free Sodium Batteries

and a competitive lifespan of 630 cycles, representing a state-of-the-art benchmark. This work establishes precise sodium compensation as a powerful lever for designing high-performance and application-specific AFSBs.