Regensburg 2019 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 9: Focus: Materials for Energy Storage

KFM 9.2: Talk

Tuesday, April 2, 2019, 10:00–10:20, PHY 5.0.21

Self-discharge behaviour of poly(vinylidene fluoride-hexafluoropropylene) for dielectric energy storage — •Tino Band¹, Till Mälzer^2,3, Sandra Wickert⁴, Hartmut S. Leipner², Stefan G. Ebbinghaus⁴, Kathrin Dörr¹, and Martin Diestelhorst¹ — ¹Institute of Physics, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06099 Halle, Germany — ²Interdisciplinary Center of Materials Science, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Straße 3, 06099 Halle, Germany — ³enspring GmbH, Weinbergweg 23, 06120 Halle, Germany — ⁴Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Straße 2, 06099 Halle, Germany

We present results about dielectric energy storage mechanisms in doctor blade coated P(VDF-HFP). One approach is using cyclic unipolar D-E characteristics to study conduction mechanisms. We define an effective conductivity for each cycle observing a Curie-von Schweidler law with steady-state conductivity. Therefore, an effective relaxation time can be obtained which is connected to self-discharge rate of the polymer. A second approach is made inversely. The self-discharge is directly investigated by means of charging-lift-discharging measurements, where the contact between measurement tip and electrode is interrupted for a specific time between charging and discharging process. Based on the self-discharge behaviour, we can conclude on conduction mechanisms. So we are able to separate the influence of polarization, depolarization and conduction mechanisms on the energy storage properties of dielectric materials in detail.