期刊
NANO RESEARCH
卷 7, 期 4, 页码 502-510出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-014-0416-0
关键词
Fe2O3 nanoparticles; carbon coating; graphene; chemical vapor deposition (CVD); anode; lithium ion batteries
类别
资金
- Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) program [00006766, N00014-09-1-1066]
- Air Force Office of Scientific Research [FA9550-09-1-0581]
- Air Force Office of Scientific Research (AFOSR) Multidisciplinary University Research Initiative (MURI) program [FA9550-12-1-0035]
- China Scholarship Council
We report a novel chemical vapor deposition (CVD) based strategy to synthesize carbon-coated Fe2O3 nanoparticles dispersed on graphene sheets (Fe2O3@C@G). Graphene sheets with high surface area and aspect ratio are chosen as space restrictor to prevent the sintering and aggregation of nanoparticles during high temperature treatments (800 degrees C). In the resulting nanocomposite, each individual Fe2O3 nanoparticle (5 to 20 nm in diameter) is uniformly coated with a continuous and thin (two to five layers) graphitic carbon shell. Further, the core-shell nanoparticles are evenly distributed on graphene sheets. When used as anode materials for lithium ion batteries, the conductive-additive-free Fe2O3@C@ G electrode shows outstanding Li+ storage properties with large reversible specific capacity (864 mAh/g after 100 cycles), excellent cyclic stability (120% retention after 100 cycles at 100 mA/g), high Coulombic efficiency (similar to 99%), and good rate capability.
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