Occupied Electronic States of Li in Li, Li2O2, and Li2O Analyzed by Soft X-ray Emission Spectroscopy

Keisuke Mukai, Ryuta Kasada, Kazuya Sasaki, Satoshi Konishi

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1 Citation (Scopus)

Abstract

Lithium metal and lithium oxides are components of lithium-oxygen (Li-O2) batteries. To accurately identify Li compounds and understand the degradation mechanism, fundamental knowledge of the electron structures of constituent elements is vital. However, experimentally derived occupied states of Li have been missing due to the intrinsic difficulties in their detection. Herein, using soft X-ray emission spectroscopy, ultrahigh-energy-resolution spectra of Li-K were collected for three critical Li compounds: Li, Li2O2, and Li2O. Large chemical shifts to lower energies and peak broadening were observed in compound-specific Li-K and O-K spectra. Theoretical calculations confirm that these changes derive from the characteristic electronic configurations of 1s and 2p states with core-level shifts in Li+. The large chemical shift (∼4.6 eV) between the Li and Li2O peaks was utilized to visualize the chemical state mapping of the Li metal/oxide phase, facilitating the identification of chemical phases in Li compounds.

Original languageEnglish
Pages (from-to)9256-9260
Number of pages5
JournalJournal of Physical Chemistry C
Volume124
Issue number17
DOIs
Publication statusPublished - 2020 Apr 30

ASJC Scopus subject areas

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

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