In Situ Study of Li Intercalation into Highly Crystalline Graphitic Flakes of Varying Thicknesses

Jianli Zou, Christopher Sole, Nicholas E. Drewett, Matej Velicky, Laurence J. Hardwick*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)
231 Downloads (Pure)

Abstract

An in situ Raman spectroelectrochemical study of Li intercalation into graphite flakes with different thicknesses ranging from 1.7 nm (3 graphene layers) to 61 nm (ca. 178 layers) is presented. The lithiation behavior of these flakes was compared to commercial microcrystalline graphite with a typical flake thickness of ∼100 nm. Li intercalation into the graphitic flakes was observed under potential control via in situ optical microscopy and Raman spectroscopy. As graphite flakes decreased in thickness, a Raman response indicative of increased tensile strain along the graphene sheet was observed during the early stages of intercalation. A progressively negative wavenumber shift of the interior and bounding modes of the split G band (E2g2(i) and E2g2(b)) is interpreted as a weakening of the C-C bonding. Raman spectra of Li intercalation into thin graphitic flakes are presented and discussed in the context of implications for Li ion battery applications, given that intercalation induced strain may accelerate carbon negative electrode aging and reduce long-term cycle life.

Original languageEnglish
Pages (from-to)4291-4296
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume7
Issue number21
Early online date14 Oct 2016
DOIs
Publication statusPublished - 03 Nov 2016

ASJC Scopus subject areas

  • Materials Science(all)

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