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首页> 外文期刊>Nanotechnology >Graphene oxide hydrogel as a restrictedarea nanoreactor for synthesis of 3D graphene-supported ultrafine TiO2 nanorod nanocomposites for high-rate lithium-ion battery anodes
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Graphene oxide hydrogel as a restrictedarea nanoreactor for synthesis of 3D graphene-supported ultrafine TiO2 nanorod nanocomposites for high-rate lithium-ion battery anodes

机译：石墨烯氧化物水凝胶作为限制性的纳米反应器，用于合成3D石墨烯 - 负载的超细TiO2纳米棒纳米复合材料，用于高速锂离子电池阳极

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摘要

Three-dimensional graphene-supported TiO2 nanorod nanocomposites (3D GS-TNR) are prepared using graphene oxide hydrogel as a restricted-area nanoreactor in the hydrothermal process, in which well-distributed TiO2 nanorods with a width of approximately 5 nm and length of 30 nm are conformally embedded in the 3D interconnected graphene network. The 3D graphene oxide not only works as a restricted-area nanoreactor to constrain the size, distribution and morphology of the TiO2; it also work as a highly interconnected conducting network to facilitate electrochemical reactions and maintain good structural integration when the nanocomposites are used as anode materials in lithium-ion batteries. Benefiting from the nanostructure, the 3D GS-TNR nanocomposites show high capacity and excellent long-term cycling capability at high current rates. The 3D GS-TNR composites deliver a high initial charge capacity of 280 mAh g(-1) at 0.2 C and maintain a reversible capacity of 115 mAh g(-1), with a capacity retention of 83% at 20 C after 1000 cycles. Meanwhile, compared with that of previously reported TiO2-based materials, the 3D GS-TNR nanocomposites show much better performance, including higher capacity, better rate capability and long-term cycling stability.
机译：三维石墨烯支持的二氧化钛纳米棒的纳米复合材料（3D GS-TNR）是使用氧化石墨烯的水凝胶作为水热方法的受限区域纳米反应器，在其中均匀分布的二氧化钛纳米棒具有大约5nm的宽度和长度的30制备纳米共形地嵌入在三维互连的石墨烯网络。所述3D氧化石墨烯不仅可以作为一个受限区纳米反应器，以限制TiO 2的尺寸，分布和形态;它也工作作为高导电互连网络以促进电化学反应并保持良好的结构整合在纳米复合材料被用作负极材料的锂离子电池。从纳米结构受益，三维GS-TNR纳米复合材料显示出在高电流速率高容量和优异的长期循环能力。所述3D GS-TNR复合材料在20℃下1000次循环后，在0.2C下递送的280毫安克（-1）的高初始充电容量和维持的115毫安克（-1）的可逆容量，以83％的容量保持率。同时，与先前报道的TiO2材料相比，3D GS-TNR纳米复合材料表现出更好的性能，包括更高的容量，更好的速度能力和长期循环稳定性。

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  • 来源
    《Nanotechnology》 |2017年第30期|共9页
  • 作者

    Cheng Jianli; Gu Guifang; Ni Wei; Guan Qun; Li Yinchuan; Wang Bin;

  • 作者单位

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Inst Chem Mat Mianyang 621900 Sichuan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    graphene nanoreactor; TiO2 nanorod; anode; lithium-ion batteries;

    机译：石墨烯纳米反应器;TiO2纳米棒;阳极;锂离子电池;

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