Synthesis of a Sodium-Ion Cathode Material Na<sub>3</sub>Fe<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>F with the Help of Fluorine Element
Wei Wei, Ye Tao, Zunqiu Xiao, Kejia Xiang, Huaying Wang, Zhongtai Zhang, Shitong Wang, Zilong Tang
Abstract
The development of cathode materials has always been one of the most crucial areas of research in the field of sodium-ion batteries. Sulfate-based polyanionic materials, known for their high working voltage characteristics, have received widespread attention. In this work, a fluoro-sulfate sodium-ion battery cathode material, Na 3 Fe 2 (SO 4 ) 3 F modified with carbon nanotubes, was developed using a low-temperature solid-state annealing method. This Na 3 Fe 2 (SO 4 ) 3 F cathode exhibits an exceptionally high voltage of 3.77 V, excellent discharge capacity (102 mAh/g at 0.1C), and good rate capability. This material broadens the research directions for cathode materials and holds promise as a foundation for the further development of high-performance sodium-ion batteries.