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- W2996527398 abstract "Tungsten, a non-Li-intercalating material, was used as a platform to study solid–electrolyte interface/interphase (SEI) formation in lithium hexafluorphosphate in mixed diethyl carbonate (DEC)/ethylene carbonate electrolyte solutions using in situ neutron reflectometry (NR). A NR measurement determines the neutron scattering length density (SLD)-depth profile, from which a composition-depth profile can be inferred. Isotopic labeling/contrast variation measurements were conducted using a series of three electrolyte solutions: one with both solvents deuterated, one with neither deuterated, and another with only DEC deuterated. A two-layer SEI formed upon polarization to +0.25 V vs Li/Li+. Insensitivity of the inner SEI layer to solvent deuteration suggested limited incorporation of hydrogen atoms from the solvent molecules. Its low SLD indicates that Li2O could be a major constituent. The outer SEI layer SLD scaled with that of the solution, indicating that it either had solution-filled porosity, incorporated hydrogen atoms from the solvent, or both. Returning the electrode to +2.65 V removed lithium from both surface layers, though the effect was more pronounced for the inner layer. Potential cycling had the effect of increasing the solution-derived species content in the inner SEI and decreased the contrast between the inner and outer layers, possibly indicating intermixing of the layers." @default.
- W2996527398 created "2019-12-26" @default.
- W2996527398 creator A5004581592 @default.
- W2996527398 creator A5051859449 @default.
- W2996527398 date "2019-12-09" @default.
- W2996527398 modified "2023-09-27" @default.
- W2996527398 title "In Situ Neutron Reflectometry Study of Solid Electrolyte Interface (SEI) Formation on Tungsten Thin-Film Electrodes" @default.
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- W2996527398 doi "https://doi.org/10.1021/acsami.9b16592" @default.
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