Role of Oxygen in Surface Structures of the Solid-Electrolyte Interphase Investigated by Sum Frequency Generation Vibrational Spectroscopy

Aimin Ge, Da Zhou, Ken Ichi Inoue, Yanxia Chen, Shen Ye

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The solid-electrolyte interphase (SEI) layer on the anode surface is crucial for the operation of lithium-ion batteries. It remains unclear how oxygen in electrolyte influences the SEI formation. We now report that the surface structures of the SEI layers are significantly affected by the oxygen in the electrolyte, by studying the SEI formation on a single-layer graphene electrode with an ethylene carbonate (EC)-based electrolyte as a model system. Surface-specific sum frequency generation spectroscopy measurements revealed that the presence of oxygen may significantly increase the polymeric species on the SEI surface. The superoxide radical anion, generated from the oxygen reduction reaction, is proposed to induce radical-initiated polymerization of the EC and form a large amount of polymeric species on the electrode surface.

Original languageEnglish
Pages (from-to)17538-17547
Number of pages10
JournalJournal of Physical Chemistry C
Volume124
Issue number32
DOIs
Publication statusPublished - 2020 Aug 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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