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  • Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries

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    Accepted Manuscript (AM)
    Author(s)
    Ling, Min
    Zhao, Hui
    Xiao, Xingcheng
    Shi, Feifei
    Wu, Mingyan
    Qiu, Jingxia
    Li, Sheng
    Song, Xiangyun
    Liu, Gao
    Zhang, Shanqing
    Griffith University Author(s)
    Zhang, Shanqing
    Zhao, Huijun
    Year published
    2015
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    Abstract
    The high capacity Si (4200 mA h g−1, Li4.4Si) commonly undergoes cracking and delamination due to drastic volume change (∼300%) during lithiation/delithiation processes in lithium ion batteries (LIBs). In this work, abundant and sustainable natural polymer gum arabic (GA) and low cost polyacrylic acid (PAA) are used to fabricate Si anodes with resilient, crack-blocking properties. The esterification reaction between GA and PAA establishes a flexible network resulting in reinforced mechanical strength and enhanced coherent strength. Meanwhile, the water vapour resulting from the esterification reaction generates micron-sized ...
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    The high capacity Si (4200 mA h g−1, Li4.4Si) commonly undergoes cracking and delamination due to drastic volume change (∼300%) during lithiation/delithiation processes in lithium ion batteries (LIBs). In this work, abundant and sustainable natural polymer gum arabic (GA) and low cost polyacrylic acid (PAA) are used to fabricate Si anodes with resilient, crack-blocking properties. The esterification reaction between GA and PAA establishes a flexible network resulting in reinforced mechanical strength and enhanced coherent strength. Meanwhile, the water vapour resulting from the esterification reaction generates micron-sized pores which relieves the stress and blocks the formation and propagation of cracks. As a result of the crack-blocking effect, the resultant Si anodes present a superior volumetric capacity of 2890 A h L−1. In addition, charge–discharge cycling for more than 1000 cycles is achieved with the Li insertion capacity limited to 1000 mA h g−1 at a 1 C rate.
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    Journal Title
    Journal of Materials Chemistry A
    Volume
    3
    DOI
    https://doi.org/10.1039/C4TA05817H
    Copyright Statement
    © 2015 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Subject
    Macromolecular and materials chemistry
    Other chemical sciences not elsewhere classified
    Materials engineering
    Publication URI
    http://hdl.handle.net/10072/67842
    Collection
    • Journal articles

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