Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 17: Postersession I

MM 17.23: Poster

Monday, March 16, 2015, 18:00–20:00, Poster E

A novel kind of solid state thin film battery — •Yaser Hamedi Jouybari and Frank Berkemeier — Institute of Material Physics, Westfälische Wilhelms-Universität Münster, Münster, Germany

Thin film lithium batteries (TFBs) are regarded as next Generation of energy storage devices for highly specialized applications. In our work we investigate a novel kind of TFB that consists of high-performance active materials. In particular, we are using thin films of LiFePO4 as cathode, LiPON as solid electrolyte, and silicon as anode. All materials are prepared by sputtering, to achieve a well-defined thickness and uniformity of the layers. To investigate the electrochemical behavior of these TFBs, the overall battery cells, as well as the individual battery components, are studied by transmission electron microscopy, atomic force microscopy, cyclic voltammetry, chronopotentiometry, and impedance spectroscopy.

In our studies it turned out that the transport across the interfaces between the electrolyte and the electrodes is most critical to TFB performance. This transport is heavily affected by some disturbing phenomena such as unwanted reaction layers, roughness of the solid electrolyte, and its degradation during subsequent deposition processes. To increase the interface quality, all of these phenomena need to be minimized and controlled by deposition parameters. Hence, in our work we report on the dependence of the TFBs performance on the deposition parameters, with particular focus on the properties of the LiPON under different deposition conditions.