Nitrogen, Oxygen-Codoped Vertical Graphene Arrays Coated 3D Flexible Carbon Nanofibers with High Silicon Content as an Ultrastable Anode for Superior Lithium Storage.
Nitrogen, Oxygen-Codoped Vertical Graphene Arrays Coated 3D Flexible Carbon Nanofibers with High Silicon Content as an Ultrastable Anode for Superior Lithium Storage.
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DOI：
10.1002/advs.202104685
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发表时间：
2022-03
期刊：
影响因子：
--
通讯作者：
Zeng L
中科院分区：
文献类型：
--
作者：
Mu Y;Han M;Wu B;Wang Y;Li Z;Li J;Li Z;Wang S;Wan J;Zeng L
具有高能量密度和长寿命的自立式和可折叠电极最近引起了对用于柔性电子设备的锂离子电池（LIB）的开发的关注。然而，低能量密度和缓慢的动力学循环阻碍了它们的实际应用。在这项工作中，通过静电纺丝，随后的热处理和化学气相沉积工艺开发了具有超高硅含量的独立和无粘合剂的N，O共掺杂的3D垂直石墨烯碳纳米纤维电极（VGA @Si@CNFs）。由于高度石墨化的碳纳米管网络和丰富的垂直石墨烯阵列，所制备的VGAs@Si@CNFs电极表现出优异的导电性和柔性。这种3D全碳结构对于提供导电和机械坚固的网络，进一步改善动力学和抑制Si NP的体积膨胀，特别是具有超高Si含量（>90重量%），是极好的。因此，VGAs@Si@CNFs复合材料作为LIB的独立阳极表现出上级的比容量（0.05 A g−1时为3619.5 mAh g− 1）、超长的使用寿命和出色的倍率性能（8 A g−1下1500次循环后为1093.1 mAh g−1）。据信，这项工作为开发用于其他储能设备的独立和高能量密度电极提供了一种令人兴奋的方法。通过在Si@CNFs上生长垂直石墨烯阵列（VGAs@Si@CNFs），成功开发了一种具有增强亲水性的自立式超高硅含量柔性阳极，它被视为“积木”和“桥梁”，以提高电极的导电性，防止Si的聚集和粉碎。这项工作为具有倍率性能和循环稳定性的高能阳极设计提供了新的思路。
Free‐standing and foldable electrodes with high energy density and long lifespan have recently elicited attention on the development of lithium‐ion batteries (LIBs) for flexible electronic devices. However, both low energy density and slow kinetics in cycling impede their practical applications. In this work, a free‐standing and binder‐free N, O‐codoped 3D vertical graphene carbon nanofibers electrode with ultra‐high silicon content (VGAs@Si@CNFs) is developed via electrospinning, subsequent thermal treatment, and chemical vapor deposition processes. The as‐prepared VGAs@Si@CNFs electrode exhibits excellent conductivity and flexibility because of the high graphitized carbon nanofiber network and abundant vertical graphene arrays. Such 3D all‐carbon architecture can be fabulous for providing a conductive and mechanically robust network, further improving the kinetics and restraining the volume expansion of Si NPs, especially with an ultra‐high Si content (>90 wt%). As a result, the VGAs@Si@CNFs composite demonstrates a superior specific capacity (3619.5 mAh g−1 at 0.05 A g−1), ultralong lifespan, and outstanding rate capability (1093.1 mAh g−1 after 1500 cycles at 8 A g−1) as a free‐standing anode for LIBs. It is believed that this work offers an exciting method for developing free‐standing and high‐energy‐density electrodes for other energy storage devices. A free‐standing ultra‐high silicon content flexible anode with enhanced hydrophilicity is successfully developed by growing vertical graphene arrays on Si@CNFs (VGAs@Si@CNFs), which is regarded as “building blocks” and “bridges” to improve the conductivity the electrode, prevent the aggregation and pulverization of Si. This work casts new light on the high‐energy anode design for possessing rate capability and cycling stability.
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