Reversible structural evolution of sodium-rich rhombohedral Prussian blue for sodium-ion batteries

Iron-based Prussian blue analogs are promising low-cost and easily prepared cathode materials for sodium-ion batteries. Their materials quality and electrochemical performance are heavily reliant on the precipitation process. Here we report a controllable precipitation method to synthesize high-performance Prussian blue for sodium-ion storage. Characterization of the nucleation and evolution processes of the highly crystalline Prussian blue microcubes reveals a rhombohedral structure that exhibits high initial Coulombic efficiency, excellent rate performance, and cycling properties. The phase transitions in the as-obtained material are investigated by synchrotron in situ powder X-ray diffraction, which shows…

• AN
  Australian Nuclear Science and Technology Organisation
• AS
  Australian Synchrotron
• CS
  China Scholarship Council

  Awards: 201606370024, G00849
• AR
  Australian Renewable Energy Agency

  Award: G00849