Enhanced Performance of Yolk-Shell Structured Si-PPy Composite as an Anode for Lithium Ion Batteries

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  • LIU Zhen
    School of Materials Science and Chemical Engineering, Ningbo University
  • LUO Yuwen
    School of Materials Science and Chemical Engineering, Ningbo University
  • ZHOU Mingjiong
    School of Materials Science and Chemical Engineering, Ningbo University
  • WANG Wenqin
    School of Materials Science and Chemical Engineering, Ningbo University
  • GAN Ning
    School of Materials Science and Chemical Engineering, Ningbo University
  • OKADA Shigeto
    Institute for Materials Chemistry and Engineering, Kyushu University
  • YAMAKI Jun-ichi
    Institute for Materials Chemistry and Engineering, Kyushu University

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抄録

Yolk-shell structured silicon-polypyrrole (Si-PPy) composite has been prepared by an in situ chemical polymerization approach. The designed parcel method significantly improves the cycling stability and rate capability compared to those of bare silicon. The Si-PPy composite exhibits a high specific capacity of 1400 mAh g−1 after 100 cycles, which is approximately 4 times higher than bare Si. Moreover, the Si-PPy composite delivers a high reversible capacity of ∼1200 mAh g−1 at a high current density of 10 A g−1, while the bare Si only achieves a low capacity of ∼490 mAh g−1 at the same current density. The outstanding electrochemical properties of the Si-PPy composites are attributed to the stability and conductivity of the PPy shell and the nanoscale structure of the composite.

収録刊行物

  • Electrochemistry

    Electrochemistry 83 (12), 1067-1070, 2015

    公益社団法人　電気化学会

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