Nanostructured potassium and sodium ion incorporated Prussian blue frameworks as cathode materials for sodium-ion batteries

Nanostructured K_xNa_yMnFe(CN)₆ (x + y ≤ 2) has been synthesized via a facile co-precipitation method. As a cathode, KNMF-3 presents a highly reversible capacity of 133.3 mA h g^-1 at 20 mA g^-1 as well as an excellent rate capacity of 92.0 mA h g^-1 at 600 mA g^-1. This material could be a good candidate as a cathode for sodium-ion batteries.