Prussian Blue and Its Analogues for Commercializing Fast-Charging Sodium/Potassium-Ion Batteries

Fast-charging technology, which reduces charging time and enhances convenience, is attracting attention. Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) are emerging as viable alternatives to lithium-ion batteries (LIBs) due to their abundant resources and low cost. However, during fast charging and discharging, the crystal structures of cathode materials in SIBs/PIBs can be damaged, negatively impacting their performance, lifespan, and capacity. To address this, there is a need to explore electrode materials with ultrahigh rate capabilities. Prussian Blue and its analogues (PB and PBAs) have shown great potential as cathode materials for both SIBs and PIBs due to their unique structures and excellent electrochemical properties. This Review examines the use of PBAs in SIBs and PIBs, focusing on the fast-charging (rate) performance and commercialization potential. Through systematic analysis and discussion, we hope to provide practical guidance for developing fast-charging SIBs and PIBs, contributing to the advancement and widespread adoption of green energy technologies.