Achieving Ultra-Long Cycling Stability in Sodium-Ion Batteries via Entropy-Stabilized Chromium-Doped Prussian Blue Analogue Cathodes

), and activates multimetal redox centers (Cr/Mn/Fe/Ni). Remarkably, Cr-HEPBA maintains 80.4% of its initial capacity after six months of air exposure, demonstrating exceptional environmental stability. This work provides a paradigm for designing robust PBA cathodes for grid-scale energy storage.