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Ultrasmall Iron Fluoride Nanoparticles Embedded in Graphitized Porous Carbon Derived from Fe‐Based Metal Organic Frameworks as High‐Performance Cathode Materials for Li Batteries
Author(s) -
Zhang Qi,
Liu NanNan,
Sun ChengZhi,
Fan LiShuang,
Zhang NaiQing,
Sun KeNing
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201900244
Subject(s) - carbon fibers , nanoparticle , metal organic framework , materials science , composite number , chemical engineering , porosity , cathode , catalysis , diffusion , metal , inorganic chemistry , nanotechnology , chemistry , organic chemistry , composite material , metallurgy , adsorption , thermodynamics , physics , engineering
Iron‐based metal organic framework (MOF) MIL‐53 is used as a precursor and self‐template to synthesize a 3D porous carbon/FeF 3 ⋅ 0.33 H 2 O composite in situ. We find that the organic ligands in iron‐containing MOFs can convert into highly graphitized carbon with the catalysis of central Fe atoms. The FeF 3 ⋅ 0.33 H 2 O nanoparticles formed after fluorination and dehydration are surrounded by highly graphitized carbon. In the composite, the graphitized 3D porous carbon can provide passageways for electron transport and ultrasmall FeF 3 ⋅ 0.33 H 2 O nanoparticles facilitate the diffusion of Li ions. The composite shows excellent performance for the Li storage. A capacity of 86 mAh g −1 can be reached at an ultra‐high rate of 20 C. Even after 300 charge−discharge cycles at 5 C, the capacity remains at 113 mAh g −1 .