In Situ Neutron Reflectometry Study of Solid Electrolyte Interface (SEI) Formation on Tungsten Thin-Film Electrodes.

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 o

SUBMITTER: Rus ED 

PROVIDER: S-EPMC7470620 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature