Lithium ion battery peformance of silicon nanowires with carbon skin

Timothy D. Bogart, Daichi Oka, Xiaotang Lu, Meng Gu, Chongmin Wang, Brian A. Korgel

Research output: Contribution to journalArticle

140 Citations (Scopus)

Abstract

Silicon (Si) nanomaterials have emerged as a leading candidate for next generation lithium-ion battery anodes. However, the low electrical conductivity of Si requires the use of conductive additives in the anode film. Here we report a solution-based synthesis of Si nanowires with a conductive carbon skin. Without any conductive additive, the Si nanowire electrodes exhibited capacities of over 2000 mA h g-1 for 100 cycles when cycled at C/10 and over 1200 mA h g-1 when cycled more rapidly at 1C against Li metal. In situ transmission electron microscopy (TEM) observation reveals that the carbon skin performs dual roles: it speeds lithiation of the Si nanowires significantly, while also constraining the final volume expansion. The present work sheds light on ways to optimize lithium battery performance by smartly tailoring the nanostructure of composition of materials based on silicon and carbon.

Original languageEnglish
Pages (from-to)915-922
Number of pages8
JournalACS Nano
Volume8
Issue number1
DOIs
Publication statusPublished - 2014 Jan 28
Externally publishedYes

Keywords

  • anode
  • carbon coating
  • in situ TEM
  • lithium-ion battery
  • nanowires
  • silicon
  • tin

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Bogart, T. D., Oka, D., Lu, X., Gu, M., Wang, C., & Korgel, B. A. (2014). Lithium ion battery peformance of silicon nanowires with carbon skin. ACS Nano, 8(1), 915-922. https://doi.org/10.1021/nn405710w