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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Poster Session II
CPP 32.16: Poster
Thursday, March 20, 2025, 09:30–12:00, P3
Lithium Distribution Heterogeneity in the Graphite Anode of 21700-Type Cylindrical Li-Ion Cells during Aging — Dominik Petz1,2, •Peter Müller-Buschbaum2, and Anatoliy Senyshyn1 — 1Heinz Maier-Leibnitz-Zentrum (MLZ), 85748 Garching, Germany — 2TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany
Electrochemical cycling in lithium-ion batteries involves an active exchange of lithium ions and electrons between the cathode and anode materials. In addition to material properties, this exchange is influenced by cell parameters such as electrode dimensions and geometry, current density, temperature, pressure, reaction rate, and others. These parameters are generally neither uniformly distributed nor static, thereby contributing to the stabilization of heterogeneous states in Li-ion batteries, typically seen in the lithium concentration distribution across the electrodes.
Previous studies have shown that, with cell aging, the distribution of lithium ions in the graphite anode of 18650-type lithium-ion batteries shifts over time. In this study, the heterogeneity of a fresh and an aged 21700-type Li-ion battery was examined using multiple diffraction techniques with both synchrotron and neutron radiation. Laboratory-based techniques such as SEM and incremental capacity analysis were also employed. The findings revealed a notable lithium distribution after cell aging, prompting the question of how cell format impacts cell aging behavior.
Keywords: lithium-ion battery; diffraction; battery aging; lithium distribution