Structure-Properties Relationship in Iron Oxide-Reduced Graphene Oxide Nanostructures for Li-Ion Batteries

Authors

  • Seung-Ho Yu,

    1. School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
    2. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Korea
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  • Donato E. Conte,

    1. Department of Chemistry, CICECO, University of Aveiro, 3810-193, Aveiro, Portugal
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  • Seunghwan Baek,

    1. School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
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  • Dong-Chan Lee,

    1. School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
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  • Seung-Keun Park,

    1. Department of Nano Science and Technology, Seoul National University, Suwon, 443-270, Korea
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  • Kyung Jae Lee,

    1. School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
    2. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Korea
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  • Yuanzhe Piao,

    1. Department of Nano Science and Technology, Seoul National University, Suwon, 443-270, Korea
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  • Yung-Eun Sung,

    Corresponding author
    1. School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
    2. Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul 151-742, Korea
    • School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
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  • Nicola Pinna

    Corresponding author
    1. School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul, 151-744, Korea
    2. Department of Chemistry, CICECO, University of Aveiro, 3810-193, Aveiro, Portugal
    3. Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Straße 2, 12489 Berlin, Germany
    • Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Straße 2, 12489 Berlin, Germany.
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Abstract

Non-aqueous sol-gel routes involving the reaction of metal oxide precursors in organic solvents (e.g., benzyl alcohol) at moderate temperature and pressure, offer advantages such as high purity, high reproducibility and the ability to control the crystal growth without the need of using additional ligands. In this paper, a study carried out on a series of iron oxide/reduced graphene oxide composites is presented to elucidate a structure-properties relationship leading to an improved electrochemical performance of such composites. Moreover, it is demonstrated that the easy production of the composites in a variety of temperature and composition ranges, allows a fine control over the final particles size, density and distribution. The materials obtained are remarkable in terms of the particle's size homogeneity and dispersion onto the reduced graphene oxide surface. Moreover, the synthesis method used to obtain the graphene oxide clearly affects the performances of the final composites through the control of the restacking of the reduced graphene oxide sheets. It is shown that a homogeneous and less defective reduced graphene oxide enables good electrochemical performances even at high current densities (over 500 mAh/g delivered at current densities as high as 1600 mA/g). The electrochemical properties of improved samples reach the best compromise between specific capacity, rate capability and cycle stability reported so far.

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