Three-dimensional silicon/carbon core-shell electrode as an anode material for lithium-ion batteries

Jung Sub Kim, Wilhelm Pfleging, Robert Kohler, Hans Jürgen Seifert, Tae Yong Kim, Dong Jin Byun, Hun Gi Jung, Wonchang Choi, Joong Kee Lee

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Practical application of silicon anodes for lithium-ion batteries has been mainly hindered because of their low electrical conductivity and large volume change (ca. 300%) occurring during the lithiation and delithiation processes. Thus, the surface engineering of active particles (material design) and the modification of electrode structure (electrode design) of silicon are necessary to alleviate these critical limiting factors. Silicon/carbon core-shell particles (Si@C, material design) are prepared by the thermal decomposition and subsequent three-dimensional (3D) electrode structures (electrode design) with a channel width of 15 μm are incorporated using the laser ablation process. The electrochemical characteristics of 3D Si@C used as the anode material for lithium-ion batteries are investigated to identify the effects of material and electrode design. By the introduction of a carbon coating and the laser structuring, an enhanced performance of Si anode materials exhibiting high specific capacity (>1200 mAh g-1 over 300 cycles), good rate capability (1170 mAh g-1 at 8 A g-1), and stable cycling is achieved. The morphology of the core-shell active material combined with 3D channel architecture can minimize the volume expansion by utilizing the void space during the repeated cycling.

Original languageEnglish
Pages (from-to)13-20
Number of pages8
JournalJournal of Power Sources
Volume279
DOIs
Publication statusPublished - 2015 Apr 1

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

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    Kim, J. S., Pfleging, W., Kohler, R., Seifert, H. J., Kim, T. Y., Byun, D. J., Jung, H. G., Choi, W., & Lee, J. K. (2015). Three-dimensional silicon/carbon core-shell electrode as an anode material for lithium-ion batteries. Journal of Power Sources, 279, 13-20. https://doi.org/10.1016/j.jpowsour.2014.12.041