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Carbon Coated Fe 3 O 4 Nanospindles as a Superior Anode Material for Lithium‐Ion Batteries
Author(s) -
Zhang WeiMing,
Wu XingLong,
Hu JinSong,
Guo YuGuo,
Wan LiJun
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200801386
Subject(s) - materials science , faraday efficiency , anode , lithium (medication) , electrochemistry , carbon fibers , hematite , electrolyte , transmission electron microscopy , chemical engineering , scanning electron microscope , coating , electrode , nanotechnology , composite material , metallurgy , composite number , medicine , chemistry , engineering , endocrinology
Carbon‐coated Fe 3 O 4 nanospindles are synthesized by partial reduction of monodispersed hematite nanospindles with carbon coatings, and investigated with scanning electron microscopy, transmission electron microscopy, X‐ray diffraction, and electrochemical experiments. The Fe 3 O 4 C nanospindles show high reversible capacity (∼745 mA h g −1 at C/5 and ∼600 mA h g −1 at C/2), high coulombic efficiency in the first cycle, as well as significantly enhanced cycling performance and high rate capability compared with bare hematite spindles and commercial magnetite particles. The improvements can be attributed to the uniform and continuous carbon coating layers, which have several functions, including: i) maintaining the integrity of particles, ii) increasing the electronic conductivity of electrodes leading to the formation of uniform and thin solid electrolyte interphase (SEI) films on the surface, and iii) stabilizing the as‐formed SEI films. The results give clear evidence of the utility of carbon coatings to improve the electrochemical performance of nanostructured transition metal oxides as superior anode materials for lithium‐ion batteries.