In-Situ Synthesis of Silicon/Polyaniline Core/Shell and Its Electrochemical Performance for Lithium-ion Batteries

Jiguo Tu, Liwen Hu, Wei Wang, Jungang Hou, Hongmin Zhu, Shuqiang Jiao

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Si/PANI core/shell composite is simply synthesized by an in-situ chemical polymerization method. The images of the obtained Si/PANI composites show that an amorphous PANI layer is adsorbed evenly on the nano-Si surface with a thickness of about 6 nm, forming the Si/PANI core/shell structure. It is observed that the Si/PANI anodes display the well cycling stability at a high rate of 1 C with the cutoff potential window of 0.01 V and 1.5 V. The initial charge capacity is 2083.8 mAh g-1, 1015.9 mAh g-1 and 583.6 mAh g-1 for the Si/PANI anodes containing 70 wt%, 50 wt% and 30 wt% PANI, respectively. Over 100 cycles, the capacity is kept at 889.6 mAh g-1,672.5 mAh g-1 and 545.3 mAh g-1, respectively. fürthermore, the reversible capacity of the Si/PANI anode containing 70 wt% PANI still maintains at 1087.8 mAh g-1 even at the rates of 1 C, 0.5 C and 0.2 C after each 100 cycles. The results indicate that the PANI shell accommodates the large volume expansion and shrinkage of Si core during the lithium intercalation and extraction process, which facilitates the contact of electrode materials, thus ensures the higher discharge and charge capacity and better cycling stability.

Original languageEnglish
Pages (from-to)A1916-A1921
JournalJournal of the Electrochemical Society
Volume160
Issue number10
DOIs
Publication statusPublished - 2013 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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