FeO_(0.7)F_(1.3)/C Nanocomposite as a High-Capacity Cathode Material for Sodium-Ion Batteries

摘要

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 FeO_(0.7)F_(1.3)/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 ℃. From the 3rd to 50th cycle, the capacity fading is only 0.14% per cycle (from 388 mAh g~(-1) at 3rd the cycle to 360 mAh g~(-1) at the 50th cycle), demonstrating superior cyclability. A high energy density of 650 Wh kg~(-1) is obtained at the material level. The reaction mechanism studies of FeO_(0.7)F_(1.3)/C with sodium show a hybridized mechanism of both intercalation and conversion reaction.