Valence Electronic Structure of Li2O2, Li2O, Li2CO3, and LiOH Probed by Soft X-ray Emission Spectroscopy

Document Type

Article

Publication Date

1-1-2017

Publication Title

Journal of Physical Chemistry C

Volume

121

Issue

10

First page number:

5460

Last page number:

5466

Abstract

The valence electronic structures of Li2CO3, Li2O, Li2O2, and LiOH were determined by soft X-ray emission spectroscopy (XES) at the oxygen K-edge. To ensure the collection of representative high-quality spectra, beam damage effects were characterized, and their influence on the spectral characteristics was minimized by limiting the exposure time (i.e., scanning the sample under the X-ray beam). We find that the spectral shapes of the four spectra are very compound-specific and allow an unambiguous speciation of these compounds. The emission lines are discussed and assigned based on published calculated oxygen-derived partial density of states. It is shown that the oxygen emission of Li2CO3, Li2O, Li2O2, and LiOH in the upper valence band is mainly related to the s- and p-like states of the carbonate anion CO3 2-, the p-like states of the oxide anion O2-, the p-like states of the peroxide anion O2 2-, and the π-like character of the OH- group, respectively. This work thus creates the basis for XES studies of the chemical reaction mechanism in energy storage devices involving these key compounds. (Graph Presented). © 2017 American Chemical Society.

Language

english

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