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.