Issue 32, 2022

Operando resonant soft X-ray emission spectroscopy of the LiMn2O4 cathode using an aqueous electrolyte solution

Abstract

The Mn 3d electronic-structure change of the LiMn2O4 cathode during Li-ion extraction/insertion in an aqueous electrolyte solution was studied by operando resonant soft X-ray emission spectroscopy (RXES). The Mn L3 RXES spectra for the charged state revealed the Mn4+ state with strong charge-transfer from the O 2p to Mn 3d orbitals dominates, while for the open-circuit-voltage and discharged states it is ascribed to the mixture of sites with Mn3+ and Mn4+ states. The degree of charge transfer is significantly different between the Mn3+ and Mn4+ states, indicating that the redox reaction takes place on the strongly-hybridized Mn 3d–O 2p orbital rather than the localized Mn 3d orbital.

Graphical abstract: Operando resonant soft X-ray emission spectroscopy of the LiMn2O4 cathode using an aqueous electrolyte solution

Supplementary files

Article information

Article type
Paper
Submitted
03 Mar 2022
Accepted
07 Jun 2022
First published
08 Jun 2022

Phys. Chem. Chem. Phys., 2022,24, 19177-19183

Operando resonant soft X-ray emission spectroscopy of the LiMn2O4 cathode using an aqueous electrolyte solution

D. Asakura, Y. Nanba, H. Niwa, H. Kiuchi, J. Miyawaki, M. Okubo, H. Matsuda, Y. Harada and E. Hosono, Phys. Chem. Chem. Phys., 2022, 24, 19177 DOI: 10.1039/D2CP01040B

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