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Stable Li-ion battery anodes by in-situ polymerization of conducting hydrogel to conformally coat silicon nanoparticles

Author

Listed:
  • Hui Wu

    (Stanford University
    State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University)

  • Guihua Yu

    (The University of Texas at Austin)

  • Lijia Pan

    (Stanford University
    National Laboratory of Microstructures (Nanjing), School of Electronic Science and Engineering, Nanjing University)

  • Nian Liu

    (Stanford University)

  • Matthew T. McDowell

    (Stanford University)

  • Zhenan Bao

    (Stanford University)

  • Yi Cui

    (Stanford University
    Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory)

Abstract

Silicon has a high-specific capacity as an anode material for Li-ion batteries, and much research has been focused on overcoming the poor cycling stability issue associated with its large volume changes during charging and discharging processes, mostly through nanostructured material design. Here we report incorporation of a conducting polymer hydrogel into Si-based anodes: the hydrogel is polymerized in-situ, resulting in a well-connected three-dimensional network structure consisting of Si nanoparticles conformally coated by the conducting polymer. Such a hierarchical hydrogel framework combines multiple advantageous features, including a continuous electrically conductive polyaniline network, binding with the Si surface through either the crosslinker hydrogen bonding with phytic acid or electrostatic interaction with the positively charged polymer, and porous space for volume expansion of Si particles. With this anode, we demonstrate a cycle life of 5,000 cycles with over 90% capacity retention at current density of 6.0 A g−1.

Suggested Citation

  • Hui Wu & Guihua Yu & Lijia Pan & Nian Liu & Matthew T. McDowell & Zhenan Bao & Yi Cui, 2013. "Stable Li-ion battery anodes by in-situ polymerization of conducting hydrogel to conformally coat silicon nanoparticles," Nature Communications, Nature, vol. 4(1), pages 1-6, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2941
    DOI: 10.1038/ncomms2941
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    Cited by:

    1. Li, Yong & Yang, Jie & Song, Jian, 2016. "Structural model, size effect and nano-energy system design for more sustainable energy of solid state automotive battery," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 685-697.
    2. Li, Yong & Yang, Jie & Song, Jian, 2016. "Nano-energy system coupling model and failure characterization of lithium ion battery electrode in electric energy vehicles," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 1250-1261.

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