Electrochemical properties of Si-Ge heterostructures as an anode material for lithium ion batteries

Taeseup Song, Huanyu Cheng, Kaitlin Town, Hyunjung Park, Robert W. Black, Sangkyu Lee, Won Il Park, Yonggang Huang, John A Rogers, Linda F. Nazar, Ungyu Paik

Research output: Contribution to journalArticlepeer-review

Abstract

Si-Ge composites have recently been explored as an anode material for lithium-ion batteries due to their stable cycle performance and excellent rate capability. Although previous reports show the benefits of Si-Ge composites on electrochemical performance, the specific mechanism and structural effects have been overlooked. Here, the structural effect of Si-Ge heterogeneous nanostructures on both mechanics and kinetics is systematically studied through theoretical analysis and detailed experimental results. Si-Ge and Ge-Si core-shell nanowires are employed for this study. The Si-Ge core-shell nanowires show a much improved electrochemical performance, especially cycle performance and rate capability, when compared to those of the Ge-Si core-shell nanowires electrode. On the basis of the detailed experimental results and associated theoretical analysis, its is demonstrated that the strain distribution and Li diffusivity and/or diffusion path are significantly affected by the Si-Ge heterostructure, which induce different mechanics and kinetics associated with lithium.

Original languageEnglish (US)
Pages (from-to)1458-1464
Number of pages7
JournalAdvanced Functional Materials
Volume24
Issue number10
DOIs
StatePublished - Mar 12 2014

Keywords

  • alloys
  • batteries
  • charge transport

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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