Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Postersession I
MM 17.11: Poster
Montag, 16. März 2015, 18:00–20:00, Poster E
In-situ Delithiation of LiMn2O4 by Laser Assisted Atom Probe Tomography — •Jonas Arlt, Björn Pfeiffer, Johannes Maier, and Carsten Nowak — Georg-August-Universität Göttingen, Institut für Materialphysik, 37077 Göttingen, Germany
Manganese dioxides have been extensively studied as cathodematerial in rechargeable Li-ion batteries. Understanding ionic conduction and energy conversion processes in the cathodematerial is crucial for the optimization of Li-ion batteries. Current experimental data is usually obtained with methods characterizing transport on a macroscopic scale, but particularly for phase separating materials transport is expected to be strongly localized. To overcome this, atom probe tomography (APT) and related techniques have been further developed to obtain local information on the chemical composition and ionic transport with sub nm resolution [1, 2].
Here, we present Laser-APT studies on LiMn2O4. Modifying the experimental conditions during the measurement allows in-situ studies of the delithiation process, revealing insights into ionic transport mechanisms. Using a focused ion beam, nanoscopic LiMn2O4 tips were prepared. Sample morphology and crystal structure were determined by transmission electron microscopy. The influence of the applied electric field, temperature and laser parameters on the delithiation process will be discussed.
References
[1] G. Schmitz et al., Z. Phys. Chem. 224, 1795 (2010).
[2] C. Escher et al., Phys. Rev. Lett. 97, 136601 (2006).