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首页> 外文期刊>Advanced Functional Materials >Role of Oxygen Functional Groups in Carbon Nanotube/ Graphene Freestanding Electrodes for High Performance Lithium Batteries
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Role of Oxygen Functional Groups in Carbon Nanotube/ Graphene Freestanding Electrodes for High Performance Lithium Batteries

机译：氧官能团在高性能锂电池碳纳米管/石墨烯自立电极中的作用

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摘要

Hierarchical functionalized multiwalled carbon nanotube (MWNT)/graphene structures with thicknesses up to tens of micrometers and relatively high density (>1 g cm~(-3)) are synthesized using vacuum filtration for the positive electrode of lithium batteries. These electrodes, which are self-standing and free of binder and current collectors, utilize oxygen functional groups for Faradaic reactions in addition to double-layer charging, which can impart high gravimetric (230 Wh kg~(-1) at 2.6 kW kg~(-1)) and volumetric (450 Wh L~(-1) at 5 kW L~(-1)) performance. It is demonstrated that the gravimetric and volumetric capacity, capacitance, and energy density can be tuned by selective removal of oxygen species from as-prepared functionalized MWNT/graphene structures with heat treatments in H_2/Ar, potentially opening new pathways for the design of electrodes with controlled surface chemistry.
机译：采用真空过滤法合成锂电池正极，制备了厚度高达数十微米，密度相对较高（> 1 g cm〜（-3））的多层功能化多壁碳纳米管（MWNT）/石墨烯结构。这些电极是自立式的，不含粘合剂和集电器，除双层充电外，还利用氧官能团进行法拉第反应，可在2.6 kW kg〜的条件下提供高重量（230 Wh kg〜（-1））。 （-1））和容量（5 kW L〜（-1）时为450 Wh L〜（-1））性能。结果表明，可以通过在H_2 / Ar中进行热处理从制备的功能化MWNT /石墨烯结构中选择性除去氧，从而调节重量和体积容量，电容和能量密度，从而可能为电极设计开辟新的途径具有受控的表面化学。

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  • 来源
    《Advanced Functional Materials》 |2013年第8期|1037-1045|共9页
  • 作者

    Hye Ryung Byon; Betar M. Gallant; Seung Woo Lee; Yang Shao-Horn;

  • 作者单位

    RIKEN Advanced Science Institute 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;

    Electrochemical Energy Lab Department of Mechanical Engineering and Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, USA;

    Electrochemical Energy Lab Department of Mechanical Engineering and Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, USA;

    Electrochemical Energy Lab Department of Mechanical Engineering and Materials Science and Engineering Massachusetts Institute of Technology Cambridge, MA 02139, USA;

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