Probing the Electrode-Electrolyte Interface in Cycled LiNi[subscript0.5]Mn[subscript 1.5]O[subscript 4] by XPS Using Mg and Synchrotron X-rays
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Probing the electrode.pdf
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Author(s)
Mansour, Azzam N.
Quinlan, Ronald A.
Kwabi, David Gator
Lu, Yi-Chun
Shao-Horn, Yang
Date Issued
October 2016
Journal
Journal of The Electrochemical Society
Publisher
Electrochemical Society
Citation
Mansour, Azzam N., David G. Kwabi, Ronald A. Quinlan, Yi-Chun Lu, and Yang Shao-Horn. “Probing the Electrode-Electrolyte Interface in Cycled LiNi0.5 Mn1.5O4 by XPS Using Mg and Synchrotron X-Rays.” Journal of The Electrochemical Society 163, no. 14 (2016): A2911–A2918.
Version
Final published version
Abstract
X-ray photoelectron spectroscopy (XPS) was used to investigate the surface chemistry of high voltage spinel, LiNi0.5Mn1.5O4 (LNMO) positive electrodes cycled 5 and 10 times in Li-cells with 1 M LiPF6 in (3:7) EC:DMC. The XPS spectra were collected using conventional Mg X-rays with energy of 1253.6 eV as well as synchrotron X-rays with energies of 2493.6 and 3498.4 eV in order to examine the depth distribution of various surface chemical species induced during cycling. The XPS spectra revealed a 5 – 10 nm surface layer of organic and LixPFyOz-type species formed as result of electrolyte decomposition, and a comparatively thinner layer composed of transition metal fluorides and LiF. These results suggest that electrolyte decomposition is a major contributor to parasitic reactions in LNMO battery electrochemistry. Limiting electrolyte decomposition with the use of solvents with wide electrochemical stability windows thus comprises a promising strategy for ensuring the practical feasibility of high voltage spinel materials in future Li-ion systems.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1149/2.0331614jes
