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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster Session I

CPP 17.49: Poster

Monday, March 27, 2023, 18:00–20:00, P3

In-situ force measurements on a gold working electrode in lithium-ion electrolytes — •Sabrina Kerz, Thomas Tilger, and Regine von Klitzing — Department of Physics, Technische Universität Darmstadt, Darmstadt, 64289, Germany

Batteries have gained a great importance in recent years. They play a vital role in our every-day lives e.g. in mobile-devices and are an important pillar in the transition to renewable energies.

For these applications the solid electrolyte interface (SEI) at electrodes is of great interest. The Gouy-Chapman-Stern (CGS) model describes the interactions of the electrolyte with the charged electrode surface as an interplay between direct adsorption (Stern Layer) and a diffuse double layer. DLVO theory describes the diffuse double layer at the electrode's surface.

In-situ colloidal probe atomic force microscopy (CP-AFM) measures the force between a silica particle and the SEI. The obtained force curves are analyzed using DLVO theory. In a three-electrode setup different potentials are applied between a gold surface (working electrode) and a reference electrode. Thus, changes in the structure of the SEI with varying potentials and salt concentrations are examined.