Regensburg 2019 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 15: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research

MM 15.4: Topical Talk

Tuesday, April 2, 2019, 11:45–12:15, H44

In-situ Studies of Electrochemical Interfaces in Lithium-ion Batteries — •Hans-Georg Steinrück — SSRL Materials Science Division, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA

In lithium-ion batteries (LIBs), the arrangement of electrolyte molecules directly at the electrode interface, and the electric double layer (EDL) formation are expected to govern the interfacial ion transport during charge/discharge and the electrochemical stability, i.e. the origin and properties of the solid electrolyte interphase (SEI). The SEI is formed on anode surfaces due to electrolyte decomposition at low potentials outside the electrolyte's electrochemical stability window, and dictates cell chemistry, cycle life, and electrochemical reversibility.

Towards this end, the first topic of this talk discusses an Å-resolution combined experimental and theoretical structural determination of solid-liquid interfaces relevant to LIBs, specifically a baseline organic electrolyte containing various concentrations of lithium hexafluorophosphate salt at a metal oxide interface. The second portion of this talk describes a multi-property characterization study of the physical and chemical properties as well as the nucleation and growth of the SEI on silicon anodes relevant to LIBs. We combined in-situ X-ray reflectivity, linear sweep voltammetry, ex-situ X-ray photoelectron spectroscopy, and first principles calculations to develop a holistic understanding of the SEI formation mechanism and properties on native oxide terminated single crystalline Si electrodes.