Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.56: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Ion diffusion in lithium titanate thin films — •Fabian Wunde, Frank Berkemeier, and Guido Schmitz — Institut für Materialphysik, Münster

Lithium titanate (LTO) is used as an anode material in lithium ion batteries, as it reveals both, a high ionic conductivity and the capability to reversibly intercalate/deintercalate lithium ions. In our work we use rf-ion beam sputtering to prepare LTO thin films. X-ray diffraction and transmission electron microscopy show, that the layers are crystalline and exhibit a strong orientation in (111) direction, a dense structure, and smooth interfaces. These properties open the possibility to integrate the LTO thin films in all-solid-state lithium ion batteries. On the other hand, the films can be used to study fundamental material properties like lithium ion hopping rates or diffusion coefficients, which are difficult to obtain in case of powder material. In this scope, galvanostatic intermittent titration technique (GITT) is used to determine the chemical diffusion coefficient of lithium within the LTO films. Due to the thin film geometry of the samples, it is possible to reliably evaluate the GITT results via the thin film approach and to determine the lithium diffusivity as function of the lithium concentration.