FeO0.7F1.3/C Nanocomposite as a High-Capacity Cathode Material for Sodium-Ion Batteries

초록

Searching high capacity cathode materials is one of the most important fields of the research and development of sodium-ion batteries (SIBs). Here, we report a FeO0.7F1.3/C nanocomposite synthesized via a solution process as a new cathode material for SIBs. This material exhibits a high initial discharge capacity of 496 mAh g(-1) in a sodium cell at 50 degrees C. From the 3(rd) to 50(th) cycle, the capacity fading is only 0.14% per cycle (from 388 mAh g(-1) at 3(rd) the cycle to 360 mAh g(-1) at the 50(th) cycle), demonstrating superior cyclability. A high energy density of 650 Wh kg(-1) is obtained at the material level. The reaction mechanism studies of FeO0.7F1.3/C with sodium show a hybridized mechanism of both intercalation and conversion reaction.

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