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首页> 外文期刊>RSC Advances >Highly monodisperse magnetite/carbon composite microspheres with a mesoporous structure as high-performance lithium-ion battery anodes
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Highly monodisperse magnetite/carbon composite microspheres with a mesoporous structure as high-performance lithium-ion battery anodes

机译：具有介孔结构的高度单分散磁铁矿/碳复合微球，如高性能锂离子电池阳极

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摘要

In this study, we propose a fabrication method for highly monodisperse magnetite/carbon (Fe3O4/C) composite microspheres with a mesoporous structure. Highly monodisperse porous polystyrene (PS) microspheres are synthesized by traditional seeded polymerization. Textural properties of porous PS microspheres can be controlled by using different amounts of diluent. In order to carbonize and introduce ferrous (Fe2+) and ferric (Fe3+) ions into the pores of PS microspheres, the sulfonation reaction is carried out using sulfuric acid. Fe3O4 nanocrystals are formed in the pores as well as on the surface of the sulfonated porous PS microspheres by a simple wet chemical method. The obtained mesoporous structure of the Fe3O4/C composite microspheres is still retained after a heat treatment in a nitrogen atmosphere. The homogeneous distribution of Fe3O4 nanocrystals in the porous carbon matrix was analyzed through elemental mapping by preparing cross-sections using focused ion beam scanning electron microscopy milling. When the composite electrodes are tested as an anode material in a Li-ion half-cell, the mesoporous Fe3O4/C composite microspheres exhibit not only a high reversible capacity of 562 mA h g(-1) after 100 cycles at 1 C but also good capacity retention at various current rates (0.1-10 C) with a high coulombic efficiency of above 99%.
机译：在该研究中，我们提出了一种具有介孔结构的高度单分散磁铁矿/碳（Fe3O4 / C）复合微球的制造方法。通过传统的种子聚合合成高度单分散多孔聚苯乙烯（PS）微球。通过使用不同量的稀释剂来控制多孔PS微球的纹理性质。为了碳化和将铁（Fe2 +）和铁（Fe3 +）离子碳化和引入PS微球的孔中，使用硫酸进行磺化反应。通过简单的湿化学方法在孔中以及磺化多孔PS微球的表面形成Fe 3 O 4纳米晶体。在氮气氛中热处理后，得到的Fe3O4 / C复合微球的所得介孔结构仍然保留。通过使用聚焦离子束扫描电子显微镜研磨制备横截面来分析多孔碳基质中Fe3O4纳米晶体中Fe3O4纳米晶体的均匀分布。当复合电极作为锂离子半电池中的阳极材料进行测试时，中孔Fe3O4 / C复合微球在100次循环后的562 mA Hg（-1）的高可逆容量上不仅高，而且也很好各种电流率（0.1-10℃）的能力保留，高库仑效率高99％。

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  • 来源
    《RSC Advances》 |2015年第54期|共7页
  • 作者

    Lim Hyung-Seok; Kim Daun; Hwang Jun-Ki; Kim Yu-Jeong; Sun Yang-Kook; Suh Kyung-Do;

  • 作者单位

    Hanyang Univ Coll Engn Dept Chem Engn Seoul 133791 South Korea;

    Hanyang Univ Coll Engn Dept Chem Engn Seoul 133791 South Korea;

    Hanyang Univ Coll Engn Dept Chem Engn Seoul 133791 South Korea;

    Hanyang Univ Coll Engn Dept Chem Engn Seoul 133791 South Korea;

    Hanyang Univ Coll Engn WCU Dept Energy Engn Seoul 133791 South Korea;

    Hanyang Univ Coll Engn Dept Chem Engn Seoul 133791 South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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