Recently, the attention to sodium-ion batteries (SIBs) has been aroused on the next generation energy storage systems applications, due to their specific advantages. However, the development of SIBs remains significant challenges. Owing to their open frameworks and porous channels for Na⁺ fast migration, the Prussian blue analogues (PBs) materials can effectively improve the electrochemical performance of SIBs. Herein, we summarize the recent advances and applications of PBs materials for SIBs in terms of preparation process, electronic mechanism and modification technology. The effects of migration ions, transition metals, bound water and vacancy on the electrochemical performance of SIBs are particularly introduced. Moreover, we summarize the research progress on the PBs-based aqueous SIBs, hybrid batteries and appropriate electrolyte. Further, the current difficulties and future research directions of the PBs-based SIBs are also discussed to give an outlook of the prospect trends and application potentials in energy storage systems.

Contents
1 Introduction
2 Preparation of Prussian blue analogues
2.1 Co-precipitation method
2.2 Hydrothermal method
3 Mechanism study of Prussian blue analogues
3.1 Migration ions
3.2 Transition metals
3.3 Bound water and vacancy
4 Modification of Prussian blue analogues
4.1 Doping
4.2 Coating
5 Aqueous rechargeable sodium-ion battery
6 Other researches
6.1 Metal-sodium hybrid battery
6.2 Electrolyte and separator
6.3 Security studies
7 Conclusion