title: Large-scale fabrication of graphene-wrapped FeF3 nanocrystals as cathode materials for lithium ion batteries.
abstract: Graphene-wrapped FeF3 nanocrystals (FeF3/G) have been successfully fabricated for the first time by a vapour-solid method, which can be generalized to synthesize other metal fluorides. The as-synthesized FeF3/G delivers a charge capacity of 155, 113, and 73 mA h g(-1) at 104, 502, and 1040 mA g(-1) in turn, displaying superior rate capability to bare FeF3. Moreover, it exhibits stable cyclability over 100 cycles with a charge capacity of 185.6 and 119.8 mA h g(-1) at 20.8 and 208 mA g(-1), respectively, which could be ascribed to the buffering effect and lowered resistance from the graphene. This versatile vapour-solid method and the improved cyclability provide a promising avenue for the application of metal fluorides as cathode materials.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Ruguang
authors.initials: R
authors.lastname: Ma
authors.forename: Zhouguang
authors.initials: Z
authors.lastname: Lu
authors.forename: Chundong
authors.initials: C
authors.lastname: Wang
authors.forename: Hong-En
authors.initials: HE
authors.lastname: Wang
authors.forename: Shiliu
authors.initials: S
authors.lastname: Yang
authors.forename: Liujiang
authors.initials: L
authors.lastname: Xi
authors.forename: Jonathan C Y
authors.initials: JC
authors.lastname: Chung
mesh_terms: D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D005290:Ferric Compounds / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008094:Lithium / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D007477:Ions; C545851:ferric fluoride; D008094:Lithium; D005459:Fluorides