XPS analysis of the SEI formed on carbonaceous materials

V. Eshkenazi, E. Peled, L. Burstein, D. Golodnitsky

Research output: Contribution to journalArticlepeer-review

Abstract

Two carbonaceous materials were produced by chemical vapour deposition of ethylene and by pyrolysis of dehydrated sucrose. Electrochemical cells assembled from these materials and metallic lithium were cycled between 0.00 and 2.00 V vs. Li/Li+ in ethylene carbonate/diethylcarbonate electrolytes containing LiPF6 or LiAsF6. The solid electrolyte interphase (SEI) formed on the carbons was characterised by X-ray photoelectron spectroscopy (XPS). We suggest that the carbon matrix has a more marked effect on the composition and thickness of the SEI than does the nature of the electrolyte. The SEI formed on graphite-like soft carbon in both electrolytes proved to be carbonate-free, its inorganic part consisting almost exclusively of LiF, while the SEI formed on hard (non-graphitizable) carbon was found to be considerably thicker and contained, in addition, phosphorus and arsenic compounds. In the bulk SEI, polymer structures (i.e., solvent-polymerisation products) were abundant in all cases, while carbonates were found only on hard carbon in the presence of LiAsF6.

Original languageEnglish
Pages (from-to)83-91
Number of pages9
JournalSolid State Ionics
Volume170
Issue number1-2
DOIs
StatePublished - 14 May 2004

Keywords

  • Carbon
  • Lithium-ion battery
  • Solid electrolyte interphase

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