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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Postersession KFM

KFM 14.5: Poster

Mittwoch, 3. April 2019, 16:00–18:30, Poster C

Dielectric properties of P(VDF-HFP)/Ceramic Composites with Respect to Energy Storage Applications — •Marius Falkenstein¹, Tino Band¹, Till Mälzer^1,2, Hartmut S. Leipner¹, Stefan G. Ebbinghaus¹, Kathrin Dörr¹, and Martin Diestelhorst¹ — ¹Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06099 Halle, Germany — ²enspring GmbH, Weinbergweg 23, 06120 Halle, Germany

Efficient energy storage is necessary for continuous power supply and mobile applications based on alternative energy sources. Because of their high power densities capacitors are interesting for this purpose. Ferroelectric P(VDF-HFP) is a promising storage material, since it exhibits a permittitvity much higher than commonly used polymers.

Within this work, we investigated the pure P(VDF-HFP) as well as nanocomposites of this polymer with powders of TiO₂ and BaTiO₃, two ceramics with high permittivities. The dielectric properties of these materials were analyzed with respect to the concrete demands for energy storage.

Besides the frequency dependence of the permittivity and loss at low fields we studied the behavior at high electric fields. Cyclic unipolar D-E-measurements at low frequencies were used to separate conductivity from dielectric properties and to determine the energy-density stored at the capacitors as well as breakdown fields. All these properties were characterized concerning their dependence on the concentration of the fillers and on temperature.