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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Energy Storage Materials and Devices II

CPP 16.1: Hauptvortrag

Montag, 9. März 2026, 17:15–17:45, ZEU/0260

Understanding the Passivation Properties of Solid Electrolyte Interphases (SEIs) in Batteries: Generator-Collector Experiments combined with a Transport and Reaction Model — •Bernhard Roling, Falk Krauss, Annalena Duncker, and Isabel Pantenburg — Department of Chemistry, University of Marburg, Germany

The solid electrolyte interphase (SEI) is a passivation layer in lithium-ion batteries, which has a strong impact on the battery lifetime. The SEI is formed by reductive decomposition of the electrolyte at the graphite particles of the anode during the first charging of the battery. The passivation of the SEI is not perfect, which leads to battery aging and to a reduced battery lifetime. The transport and reaction mechanism in the SEI governing the passivation properties are not well understood. Here, we elucidate transport and reaction processes during the formation of model-type SEIs by combining generator-collector experiments with a transport and reaction model. In the generator-collector experiments, we use a four-electrode-based setup to compare the electrolyte reduction current with a redox molecule reduction current at the SEI-covered electrode. We find that the current ratio depends on the SEI formation potential as well as on the formation time. The experimental results are compared to a transport and reaction model predicting four distinct transport and reaction regimes depending on the rate constant for the molecule-electron reaction. Using this combined approach, we obtain good estimates for the transport coefficients of both electrons and molecules inside the SEI.

Keywords: Batteries; Solid Electrolyte Interphase (SEI); Passivation; Transport and Reaction; Generator-Collector Experiments