Electrochemical properties of NaxMnFe(CN)6·zH2O synthesized in a Taylor-Couette reactor as a Na-ion battery cathode material

When cycled at 0.1 C in a potential range of 2.0-4.0 V, cubic-, monoclinic-, and rhombohedral-structured samples exhibited reversible discharge capacities of 89.5, 91.4, and 150.1 mAhh g−1, respectively. Importantly, the rhombohedral-structured sample not only showed the highest reversible discharge capacity but also exhibited excellent capacity retention (88.03%) after 50 cycles at 0.5 C (300 mA g−1), which was ascribed to its extremely low interstitial water content.