期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 1, 页码 376-381出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504035
关键词
composite; graphene; hollow microspheres; Li-ion batteries; magnetite
资金
- National Natural Science Foundation of China (NSFC) [21543010, 21203133, 21301124, 21473120, 51272168]
The electrode materials with hollow structure and/or graphene coating are expected to exhibit outstanding electrochemical performances in energy-storage systems. 2D graphene-wrapped hollow C/Fe3O4 microspheres are rationally designed and fabricated by a novel facile and scalable strategy. The core@double-shell structure SPS@FeOOH@GO (SPS: sulfonated polystyrene, GO: graphene oxide) microspheres are first prepared through a simple one-pot approach and then transformed into C/Fe3O4@G (G: graphene) after calcination at 500 degrees C in Ar. During calcination, the Kir-kendall effect resulting from the diffusion/reaction of SPS-derived carbon and FeOOH leads to the formation of hollow structure carbon with Fe3O4 nanoparticles embedded in it. In the rationally constructed architecture of C/Fe3O4@G, the strongly coupled C/Fe3O4 hollow microspheres are further anchored onto 2D graphene networks, achieving a strong synergetic effect between carbon, Fe3O4, and graphene. As an anode material of Li-ion batteries (LIBs), C/Fe3O4@G manifests a high reversible capacity, excellent rate behavior, and outstanding long-term cycling performance (1208 mAh g(-1) after 200 cycles at 100 mA g(-1)).
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