Regensburg 2019 – wissenschaftliches Programm
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 Mälzer1,2, 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.