Dresden 2026 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 4: Materials for the Storage and Conversion of Energy I

MM 4.7: Vortrag

Montag, 9. März 2026, 12:15–12:30, SCH/A216

Voltage-Dependent CEI Development on LMO Cathodes in-situ monitored via Langasite Microgravimetry — •Robert Löser and Guido Schmitz — University of Stuttgart, Stuttgart, Germany

Understanding the formation and evolution of the cathode-electrolyte interphase (CEI) is essential for improving the stability of high-voltage lithium-ion battery materials such as LiMn2O4 (LMO). In this work, we investigate the CEI formation and composition in-situ on sputtered LMO thin films using an electrochemical microbalance based on a Langasite (La3Ga5SiO14) resonator. Unlike conventional quartz crystal microbalances, Langasite substrates enable high-temperature annealing of sputtered oxide films while keeping their piezoelectric properties, making them uniquely suited for preparing crystalline cathode layers directly on the resonator surface. LMO films were cycled to different upper voltage cutoffs to investigate how oxidative potentials influence CEI formation. The coupled electrochemical-gravimetric data reveal clear voltage-dependent mass changes associated with electrolyte decomposition, surface reconstruction, and dissolution processes. By correlating frequency shifts with electrochemical signatures, we quantify the onset, magnitude, and reversibility of CEI species formation dependent of the upper voltage boundary. This study demonstrates that Langasite-based microgravimetry enables powerful, in-situ investigation of CEI evolution and interphase dynamics on annealed cathode films such as LMO, opening the way for systematic studies across a broader range of high-temperature processed electrodes.

Keywords: CEI formation; Battery cathode material; Microgravimetry; Lithium Ion Battery