x MnFe(CN) 6· zH 2O synthesized in a Taylor-Couette reactor as a Na-ion battery cathode material]]>

摘要

AbstractTaylor-Couette reactors allow short reaction times and enable the synthesis of powders with uniform particle size, and thus are suitable for preparing secondary battery cathode materials. Herein, cubic, monoclinic, and rhombohedral NaxMnFe(CN)6·zH2O samples were prepared in a Taylor-Couette reactor at various drying conditions/temperature and were shown to exhibit structure-dependent electrochemical properties.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.Highlights?Prussian white have three different crystalline structures.?It was different by varying the synthesis temperature and the drying conditions.?The rhombohedral that removed interstitial water perform the highest capacity and cycle.?The capacity retention showed 88.03% after 50 cycles.]]>