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MM: Fachverband Metall- und Materialphysik

MM 31: Postersitzung II

MM 31.16: Poster

Mittwoch, 16. März 2011, 17:15–18:45, P5

Intercalation Mechanism and Aging Effects in LiFePO4 as Cathode Material for Li-Ion-Cells — •Birte Riechers, Sebastian Mathes, Carsten Nowak, and Cynthia A. Volkert — Institut für Materialphysik, Georg-August-Universität Göttingen, Germany

Since Lithium Iron Phosphate was recently established as a cathode material for high-current Li-Ion cells, intercalation mechanisms and aging effects in this material come to the forefront of scientific investigations. An enhanced understanding of time- and cycling-mode dependent changes of Li-intercalation processes of LiFePO4 contributes to these efforts. Using commercial, self-prepared, and thin-film model Li-ion cells, microstructural changes and aging effects are investigated using (in-situ) SEM, XRD.

The progress of degradation depending on electrolyte, method of cell preparation, and cycling conditions is studied. The homogeneous intercalation structure of pristine cells changes to a spatially heterogeneous structure due to different intercalation kinetics and phase distributions. This occurs even within single cathode material particles. Thin-film model cell cathode intercalation processes are being compared to the behaviour of cathodes consisting of particles.