Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 35: Additive Manufacturing / Transport in Materials III
MM 35.4: Talk
Thursday, March 12, 2026, 16:30–16:45, SCH/A216
Visualizing lithium dynamics in battery electrodes by operando optical microscopy — •Monica Mead1, Shihao Wei1, Vidula Ambure1, Nadine Kerner1, Roham Talei1, Yug Joshi2, and Guido Schmitz1 — 1Max Planck-Institut für nachhaltige Materialien GmbH, Max-Planck-Straße 1, 40237 Düsseldorf — 2Universität Stuttgart, Heisenbergstraße 3, 70569 Stuttgart
Typically, chemical diffusion coefficients of Li-ions in battery electrodes are measured by purely electrochemical methods such as potentiostatic or galvanostatic intermittent titration technique (GITT/PITT), cyclic voltammetry (CV) or electrochemical impedance spectroscopy (EIS). Surprisingly, the correspondingly determined diffusion coefficients vary within up to ten orders of magnitude. This cannot be explained solely by the influence of concentration dependence and microstructure. To clarify the origin and thereby understand which additional factors influence the ion transport, alternative methods have to be developed and applied. Therefore, we apply a method based on optical microscopy and the optical response upon Li intercalation in different Li-ion battery electrodes, such as lithium manganese oxide, lithium titanate, vanadium oxide and silicon. With this method, the transport along several hundreds of micrometres can be measured, which allows differentiation between different transport mechanisms (diffusion/transport across a kinetic barrier). We find that above-mentioned electrochemical methods tend to underestimate the diffusion coefficient. We discuss the origin with respect to the transport mechanism.
Keywords: cChemical diffusion; optical properties; Li-ion battery