Romanechite-structured Na0.31MnO1.9 nanofibers as high-performance cathode material for a sodium-ion battery

A new cathode material composed of romanechite-structured Na0.31MnO1.9 nanofibers is developed for sodium-ion batteries for the first time. It can deliver a Na-uptake capacity of >100 mA h g−1 with a superior high-rate capability and good cycling performance in the voltage range of 2–4.5 V vs. Na+/Na, and exhibit the unique ability of fast charging with the normal discharge rate.