▎ 摘　　要

Although Prussian blue analogues (PBAs) show promising potential applications as cathodes for sodium ion batteries, great challenges still remain to develop high-performance PBAs. In this work, we report the synthesis of high-performance manganese hexacyanoferrate/graphene (MnHCF/G) nanocomposites using a facile ball-milling route. It was found that after the ball-milling process, the MnHCF nanoparticles were pulverized into smaller grains that were uniformly anchored onto the few-layered graphene nanosheets. The product exhibits high capacity (142.7 mA h g(-1) at 0.1C), high working voltage (approximate to 3.7 V at 0.1C), superior rate capability (115.8 mA h g(-1) at 10C and 89.7 mA h g(-1) at 20C) and long cycle life (90.6% after 500 cycles at 1C, 91.8% after 1700 cycles at 5C, and 86.0% after 2000 cycles at 10C). The excellent electrochemical performance of MnHCF/G is ascribed to the small size of MnHCF and the conductive and protective effects of graphene. This work provides a practical method to synthesize high-performance PBA-based materials for sodium-ion batteries.