In　this　work,　high　quality　iron　hexacyanoferrate　nanocubes　(HQ-PB　NCs)　were　synthesized　through　a　simple　hydrothermal　method　and　then　investigated　as　cathode　electrode　materials　for　aqueous　sodium-ion　batteries　(SIBs),　which　displayed　a　much　enhanced　electrochemical　performance　compared　with　the　PB　nanoparticles　with　low　quality　(LQ-PB　NPs).　The　HQ-PB　NCs　could　be　promising　cathode　materials　for　aqueous　SIBs.