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首页> 外文期刊>Advanced Functional Materials >Fe_3O_4 Nanoparticles Embedded in Uniform Mesoporous Carbon Spheres for Superior High-Rate Battery Applications
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Fe_3O_4 Nanoparticles Embedded in Uniform Mesoporous Carbon Spheres for Superior High-Rate Battery Applications

机译：Fe_3O_4纳米粒子嵌入均匀的介孔碳球中，可提供出色的高速率电池应用

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摘要

Robust composite structures consisting of Fe_3O_4 nanoparticles (～5 nm) embedded in mesoporous carbon spheres with an average size of about 70 nm (IONP@mC) are synthesized by a facile two-step method: uniform Fe_3O_4 nanoparticles are first synthesized, followed by a post-synthetic low-temperature hydrothermal step to encapsulate them in mesoporous carbon spheres. Instead of graphene, which has been extensively reported for use in high-rate battery applications as a carbonaceous material combined with metal oxides, mesoporous carbon is chosen to enhance the overall performances. The interconnecting pores facilitate the penetration of electrolyte, leading to direct contact between electrochemically active Fe_3O_4 and lithium ion-carrying electrolyte, greatly facilitating lithium ion transportation. The interconnecting carbon framework provides continuous 3D electron transportation routes. The anodes fabricated from IONP@mC are cycled under high current densities ranging from 500 to 10 000 mA g~(-1). A high reversible capacity of 271 mAh g~(-1) is reached at 10 000 mAh g~(-1), demonstrating its superior high rate performance.
机译：通过简便的两步法合成由Fe_3O_4纳米粒子（〜5 nm）（约5 nm）埋入平均直径约70 nm的中孔碳球（IONP @ mC）组成的坚固的复合结构：首先合成均匀的Fe_3O_4纳米粒子，然后合成后合成的低温水热步骤将它们封装在介孔碳球中。代替已广泛报道的用于高速率电池应用的石墨烯作为与金属氧化物结合的碳质材料，而是选择中孔碳来增强整体性能。相互连通的孔促进了电解质的渗透，从而导致电化学活性的Fe_3O_4与携带锂离子的电解质之间的直接接触，极大地促进了锂离子的运输。互连的碳骨架提供了连续的3D电子传输路径。由IONP @ mC制成的阳极在500至10000 mA g〜（-1）的高电流密度下循环。在10000 mAh g〜（-1）时可达到271 mAh g〜（-1）的高可逆容量，证明了其卓越的高倍率性能。

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  • 来源
    《Advanced Functional Materials》 |2014年第3期|319-326|共8页
  • 作者

    Yu Chen; Bohang Song; Meng Li; Li Lu; Junmin Xue;

  • 作者单位

    Department of Materials Science and Engineering National University of Singapore Singapore, 117576;

    Department of Mechanical Engineering National University of Singapore Singapore, 117576;

    Department of Materials Science and Engineering National University of Singapore Singapore, 117576;

    Department of Mechanical Engineering National University of Singapore Singapore, 117576;

    Department of Materials Science and Engineering National University of Singapore Singapore, 117576;

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