Hierarchical Mesoporous Iron Fluoride with Superior Rate Performance for Lithium-Ion Batteries

Monodispersed mesoporous iron fluorides were synthesized by a low-cost reversed micelle method. The as-prepared materials with hierarchical mesoporous structure exhibit excellent rate capability (115.6 mAh g–1 at 2000 mA g–1) which is superior to many other carbon-free iron fluorides. In addition, a high reversible capacity of 143.2 mAh g–1 can be retained after 100 cycles at 1000 mA g–1. The outstanding electrochemical features can be attributed to the particular hierarchical mesoporous structure, facilitating electrolyte penetration as well as rapid electronic and ionic transportation.