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Ethylene carbonate adsorption on the major surfaces of lithium manganese oxide Li1−xMn2O4 1 spinel (0.000 < x < 0.375): a DFT+U-D3 study

Ramogayana, Brian, Santos-Carballal, David, Aparicio, Pablo A., Quesne, Matthew G., Maenetja, Khomotso P., Ngoepe, Phuti E. and de Leeuw, Nora H. 2020. Ethylene carbonate adsorption on the major surfaces of lithium manganese oxide Li1−xMn2O4 1 spinel (0.000 < x < 0.375): a DFT+U-D3 study. Physical Chemistry Chemical Physics 22 (12) , Phys. Chem. Chem. Phys., 2020,22, 6763-6771. 10.1039/C9CP05658K
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Understanding the surface reactivity of the commercial cathode material LiMn2O4 towards the electrolyte is important to improve the cycling performance of secondary lithium-ion batteries and to prevent manganese dissolution. In this work, we have employed spin-polarized density functional theory calculations with on-site Coulomb interactions and long-range dispersion corrections [DFT+U-D3-(BJ)] to investigate the adsorption of the electrolyte component ethylene carbonate (EC) onto the (001), (011) and (111) surfaces of the fully lithiated and partially delithiated Li1−xMn2O4 spinel (0.000 < x < 0.375). The surface interactions were investigated by evaluating the adsorption energies of the EC molecule and the surface free energies. Furthermore, we analyzed the impact of EC adsorption on the Wulff crystal morphologies, the molecular vibrational frequencies and the adsorbate/surface charge transfers. The adsorption energies indicate that the EC molecule strongly adsorbs on the (111) facet, which is attributed to a bidentate binding configuration. We found that EC adsorption enhances the stability of the (111) facet, as shown by the Wulff crystal morphologies. Although a negligible charge transfer was calculated between the spinel surfaces and the EC molecule, a large charge rearrangement takes place within the surfactant upon adsorption. The wavenumbers of the CO stretching mode for the interacting EC molecule are red-shifted with respect to the isolated adsorbate, suggesting that this bond becomes weaker. The surface free energies show that both the fully lithiated and partially delithiated forms of the LiMn2O4 surfaces are stabilized by the EC molecule.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1463-9076
Date of First Compliant Deposit: 16 March 2020
Date of Acceptance: 16 February 2020
Last Modified: 20 Jan 2021 11:36

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