Edge effects on the characteristics of Li diffusion in graphene

Chananate Uthaisar, Veronica Barone

Research output: Contribution to journalArticlepeer-review

376 Scopus citations

Abstract

We study the adsorption and diffusion of Li atoms on the surface of planar graphenes by means of density functional theory. When the dimensionality of graphene is reduced to a quasi-one-dimension, armchair and zigzag edges appear. We show that the presence of these edges affects not only the reactivity of the carbon material toward the adsorption of Li adatoms but also their diffusion properties. These properties strongly depend on the specific morphology of the edges. Our results indicate that Li adatoms will diffuse toward the edges while Li diffusion channels appear along the ribbon axis. For most of the diffusion paths studied here, energy barriers are lower than those in graphene. This effect is significantly more pronounced toward the edges, where energy barriers can be up to 0.15 eV smaller than those in in graphene, producing an increase of up to 2 orders of magnitude in the diffusion coefficient at room temperature. Our results indicate that electrodes fabricated with these materials should increase the power of Li-ion batteries.

Original languageEnglish
Pages (from-to)2838-2842
Number of pages5
JournalNano Letters
Volume10
Issue number8
DOIs
StatePublished - Aug 11 2010

Keywords

  • Edge effects
  • density functional theory
  • graphene
  • lithium diffusion
  • nanoribbons

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