Vacancies‐regulated Prussian Blue Analogues through Precipitation Conversion for Cathodes in Sodium‐ion Batteries with Energy Densities over 500 Wh/kg

Prussian blue analogues (PBAs) have been widely applied in many fields, especially as cathode materials of sodium-ion batteries on account of their low cost and open framework for fast ions transport. However, the capacity of reported PBAs has a great distance from its theoretical value. Herein, we proposed that [Fe(CN)