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首页> 外文期刊>Advanced energy materials >Interweaving 3D Network Binder for High-Areal-Capacity Si Anode through Combined Hard and Soft Polymers
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Interweaving 3D Network Binder for High-Areal-Capacity Si Anode through Combined Hard and Soft Polymers

机译：通过硬和软聚合物的组合，交织用于高容量硅阳极的3D网络粘合剂

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摘要

Si anodes suffer an inherent volume expansion problem. The consensus is that hydrogen bonds in these anodes are preferentially constructed between the binder and Si powder for enhanced adhesion and thus can improve cycling performance. There has been little research done in the field of understanding the contribution of the binder's mechanical properties to performance. Herein, a simple but effective strategy is proposed, combining hard/soft polymer systems, to exploit a robust binder with a 3D interpenetrating binding network (3D-IBN) via an in situ polymerization. The 3D-IBN structure is constructed by interweaving a hard poly(furfuryl alcohol) as the skeleton with a soft polyvinyl alcohol (PVA) as the filler, buffering the dramatic volume change of the Si anode. The resulting Si anode delivers an areal capacity of 10 mAh cm(-2) and enables an energy density of 300 Wh kg(-1) in a full lithium-ion battery (LIB) cell. The component of the interweaving binder can be switched to other polymers, such as replacing PVA by thermoplastic polyurethane and styrene butadiene styrene. Such a strategy is also effective for other high-capacity electroactive materials, e.g., Fe2O3 and Sn. This finding offers an alternative approach in designing high-areal-capacity electrodes through combined hard and soft polymer binders for high-energy-density LIBs.
机译：硅阳极遭受固有的体积膨胀问题。普遍认为，这些阳极中的氢键优先在粘合剂和Si粉之间构建，以增强附着力，因此可以改善循环性能。在了解粘合剂的机械性能对性能的贡献的领域中，很少进行研究。在本文中，提出了一种简单而有效的策略，将硬/软聚合物系统结合起来，通过原位聚合开发具有3D互穿结合网络（3D-IBN）的坚固粘合剂。 3D-IBN结构是通过将作为骨架的硬质聚糠醇与作为填充剂的软质聚乙烯醇（PVA）交织而构造的，从而缓冲了硅阳极的体积急剧变化。所得的Si阳极可提供大于10 mAh cm（-2）的面容量，并在完整的锂离子电池（LIB）电池中实现大于300 Wh kg（-1）的能量密度。交织粘合剂的组分可以转换为其他聚合物，例如用热塑性聚氨酯和苯乙烯丁二烯苯乙烯代替PVA。这样的策略对于其他高容量电活性材料，例如Fe 2 O 3和Sn也是有效的。这一发现为通过高能密度LIB的硬质和软质聚合物结合剂设计高面积容量的电极提供了另一种方法。

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  • 来源
    《Advanced energy materials》 |2019年第3期|1802645.1-1802645.9|共9页
  • 作者

    Liu Tiefeng; Chu Qiaoling; Yan Cheng; Zhang Shanqing; Lin Zhan; Lu Jun;

  • 作者单位

    Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Guangdong, Peoples R China|Griffith Univ, Sch Environm & Sci, Ctr Clean Environm & Energy, Gold Coast Campus, Gold Coast, Qld 4222, Australia;

    QUT, Sch Chem Phys & Mech Engn, Sci & Engn Fac, Brisbane, Qld 4001, Australia;

    QUT, Sch Chem Phys & Mech Engn, Sci & Engn Fac, Brisbane, Qld 4001, Australia;

    Griffith Univ, Sch Environm & Sci, Ctr Clean Environm & Energy, Gold Coast Campus, Gold Coast, Qld 4222, Australia;

    Guangdong Univ Technol, Sch Chem Engn & Light Ind, Guangzhou 510006, Guangdong, Peoples R China;

    Argonne Natl Lab, Chem Sci & Engn Div, 9700 Cass Ave, Lemont, IL 60439 USA;

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  • 正文语种 eng
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  • 关键词

    3D network binders; hard and soft polymers; high areal capacity; lithium-ion batteries; Si anodes;

    机译：3D网络粘合剂;硬和软聚合物;高容量;锂离子电池;硅阳极;

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