Regensburg 2013 – scientific programme

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MI: Fachverband Mikrosonden

MI 2: Topical Session: Using Transmission Electron Microscopy to Unravel the Mysteries of Materials II - Joint Session with MM

MI 2.4: Talk

Monday, March 11, 2013, 13:00–13:15, H4

Investigation of innovative capacitors for energy storage based on 0-3 composites — •Jens Glenneberg, Gerald Wagner, Alexandra Buchsteiner, Mandy Zenkner, Thomas Großmann, Claudia Ehrhardt, Stefan G. Ebbinghaus, Martin Diestelhorst, Sebastian Lemm, Wolfram Münchgesang, Horst Beige, and Hartmut S. Leipner — Martin-Luther-Universität, Halle-Wittenberg, 06099 Halle

Currently energy storage is an interesting and important topic. Next to accumulators, thin film capacitors with high energy densities are feasible. The aim of our work is to develop novel capacitors exhibiting several advantages like very quick charging and discharging times, long lifetimes and high robustness as well as low manufacturing costs.

For this purpose, ceramic nanoparticles with perovskite structure and high permittivities (BaTiO₃, Ba(Ti,Ge)O₃, CaCu₃Ti₄O₁₂) are embedded in either an organic polymer or an inorganic glass matrix. In order to achieve a uniform dispersion, the nanoparticles are coated with a specific surfactant depending on the matrix. Size and distribution of the embedded particles have a strong effect on the electrical properties of the capacitor dielectrics. Therefore, accurate knowledge of the microstructure is necessary. The single composites are imaged via environmental scanning electron microscopy (ESEM) in secondary electron (SE) and backscattered electron contrast (BSE). Additionally, transmission electron microscopy (TEM) investigations are carried out and energy-dispersive X-ray spectroscopy is conducted in order to get compositional information.