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  • Interweaving 3D Network Binder for High-Areal-Capacity Si Anode through Combined Hard and Soft Polymers

    Author(s)
    Liu, Tiefeng
    Chu, Qiaoling
    Yan, Cheng
    Zhang, Shanqing
    Lin, Zhan
    Lu, Jun
    Griffith University Author(s)
    Zhang, Shanqing
    Year published
    2019
    Metadata
    Show full item record
    Abstract
    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 ...
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    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.
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    Journal Title
    Advanced Energy Materials
    Volume
    9
    Issue
    3
    DOI
    https://doi.org/10.1002/aenm.201802645
    Subject
    Macromolecular and materials chemistry
    Materials engineering
    Science & Technology
    Physical Sciences
    Technology
    Chemistry, Physical
    Energy & Fuels
    Publication URI
    http://hdl.handle.net/10072/387517
    Collection
    • Journal articles

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