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首页> 外文OA文献 >Hierarchical self-assembled structures based on nitrogen-doped carbon nanotubes as advanced negative electrodes for Li-ion batteries and 3D microbatteries
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Hierarchical self-assembled structures based on nitrogen-doped carbon nanotubes as advanced negative electrodes for Li-ion batteries and 3D microbatteries

机译：基于氮掺杂碳纳米管的分层自组装结构，作为锂离子电池和3D微型电池的高级负极

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Hierarchical structures based on carbon paper and multi-walled nitrogen-doped carbon nanotubes were fabricated and subsequently decorated with hematite nanorods to obtain advanced 3D architectures for Li-ion battery negative electrodes. The carbon paper provides a versatile metal-free 3D current collector ensuring a good electrical contact of the active materials to its carbon fiber network. Firstly, the nitrogen-doped carbon nanotubes onto the carbon paper were studied and a high footprint area capacity of 2.1 mAh cm−2 at 0.1 mA cm−2 was obtained. The Li can be stored in the inter-wall regions of the nanotubes, mediated by the defects formed on their walls by the nitrogen atoms. Secondly, the incorporation of hematite nanorods raised the footprint area capacity to 2.25 mAh cm−2 at 0.1 mA cm−2. However, the repeated conversion/de-conversion of Fe2O3 limited both coulombic and energy efficiencies for these electrodes, which did not perform as well as those including only the N-doped carbon nanotubes at higher current densities. Thirdly, long-cycling tests showed the robust Li insertion mechanism in these N-doped carbonaceous structures, which yielded an unmatched footprint area capacity enhancement up to 1.95 mAh cm−2 after 60 cycles at 0.3 mA cm−2 and an overall capacity of 204 mAh g−1 referred to the mass of the entire electrode.
机译：制造了基于复写纸和多壁掺氮碳纳米管的分层结构，随后用赤铁矿纳米棒修饰以获得用于锂离子电池负极的高级3D结构。碳纸提供了一种通用的无金属3D集电器，可确保活性材料与其碳纤维网络之间实现良好的电接触。首先，研究了碳纸上的氮掺杂碳纳米管，在0.1 mA cm-2下获得了2.1 mAh cm-2的高足迹面积容量。 Li可以被存储在纳米管的壁间区域中，其由氮原子在其壁上形成的缺陷所介导。其次，掺入赤铁矿纳米棒使印迹面积容量在0.1 mA cm-2时达到2.25 mAh cm-2。然而，Fe2O3的重复转换/反转换限制了这些电极的库仑效率和能量效率，在较高的电流密度下，它们的性能不如仅包含N掺杂的碳纳米管。第三，长周期测试表明，在这些N掺杂碳质结构中强健的Li插入机制，在0.3 mA cm-2下循环60次后，无可替代的足迹面积容量增强至1.95 mAh cm-2，总容量为204 mAh g-1是指整个电极的质量。

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