Mesocrystalline coordination polymer as a promising cathode for sodium-ion batteries.

Prussian blue (PB) mesocrystals with Na as the alkaline metal were synthesized and used as cathode materials in Na-ion batteries. The mesocrystalline structure endowed PB with very different phase change behavior and electrochemical performance in contrast to PB single-crystals in cyclic voltammograms and galvanostatic discharge/charge voltage profiles of PB/Na half-cells.