Crystallographic-plane tuned Prussian-blue wrapped with RGO: a high-capacity, long-life cathode for sodium-ion batteries

Using {100} plane-capped cubic K_0.33FeFe(CN)₆/RGO as the cathode, an initial discharge–charge capacity of 159–161 mA h g⁻¹ at 0.5C, and a superior capacity retention of 90.1% at 10C after 500 cycles can be obtained.