Nascent SEI-Surface Films on Single Crystalline Silicon Investigated by Scanning Electrochemical Microscopy

Eduardo Dos Santos Sardinha, Michael Sternad, H. Martin R. Wilkening, Gunther Wittstock*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Silicon is a promising high-capacity host material for negative electrodes in lithium-ion batteries with low potential for the lithiation/delithiation reaction that is outside the stability window of organic carbonate electrolytes. Thus, the use of such electrodes critically depends on the formation of a protective solid electrolyte interphase (SEI) from the decomposition products of electrolyte components. Due to the large volume change upon charging, exposure of the electrode material to the electrolyte must be expected, and facile reformation of SEI is a scope for improving the stabilities of such electrodes. Here, we report the formation of incipient SEI layers on monocrystalline silicon by in situ imaging of their passivating properties using scanning electrochemical microscopy after potentiodynamic charging to different final potentials. The images show a local initiation of the SEI growth at potentials of around 1.0 V vs Li/Li+ in 1 M LiClO4 in propylene carbonate.

Original languageEnglish
Pages (from-to)1388-1392
Number of pages5
JournalACS Applied Energy Materials
Volume2
Issue number2
DOIs
Publication statusPublished - 25 Feb 2019

Keywords

  • incremental charging
  • scanning electrochemical microscopy
  • silicon electrode
  • single crystalline electrode
  • solid electrolyte interphase

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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