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MM: Fachverband Metall- und Materialphysik

MM 19: Poster Session

MM 19.45: Poster

Dienstag, 10. März 2026, 18:00–20:00, P5

Li transport in V2O5 quantified by optical microscopy — •Vidula Angane-Ambure, Monica Mead, and Guido Schmitz — Institute of Materials Science, University of Stuttgart, Heisenbergstraße 3, 70569 Stuttgart, Germany

Vanadium pentoxide (V2O5) is an interesting cathode material due to its layered structure and high theoretical capacity; however, its electrochemical performance is strongly limited by lithium-ion transport and the evolution of phase boundaries during (de)intercalation. To measure lithium-ion transport in V2O5 and clarify transport mechanisms we apply a novel method that uses the optical response upon ion intercalation in in-situ optical microscopy. In this setup a clear diffusion geometry is established and therefore weaknesses of conventional electrochemical methods for quantification of diffusion in battery electrode materials can be circumvented. By evaluating the measured RGB values, the diffusion front is determined. Diffusional transport can then be separated from linear transport across a kinetic interface (such as phase boundaries) and the temperature dependence of the ion transport is quantified, yielding an activation energy for transport in V2O5. Additionally, the concentration-dependence of Li transport in V2O5 is studied in lithiation and delithiation experiments, showing faster delithiation than lithiation.

Keywords: V₂O₅; concentration-dependence; lithium-ion transport; temperature dependence of the ion transport; activation energy for transport