Dr. Vladimir V. Shvartsman

Privatdozent at the Institute for Materials Science
Faculty of Engineering
University of Duisburg-Essen, Essen, Germany

Short Bio: Dr. Vladimir V. Shvartsman done PhD from L. Ya. Karpov Institute of Physical Chemistry, Moscow, Russia and Postdoctoral research from University of Aveiro, Portugal.. His research interests are functional materials with ferroelectric, piezoelectric, and electro-caloric properties, investigation of nanoscale properties of functional materials using scanning probe microscopy techniques, multiferroic materials: study of coupling between polar and magnetic subsystems, search for new types of magnetoelectric materials and synthesis and characterization of composite functional materials. He is editor of journal “Materials”, “Solids”. He is author of 5 Book chapters, 196 Articles in peer reviewed journals, 34 publications in Proceedings of Conferences with overall Citations > 6600, h-index 42 (Scopus, August 2023)

Keynote Topic: Dielectric materials for electrical energy storage

Abstract: Nowadays, the development of portable electronic devices, electric vehicles, etc. has caused a boom in research aimed at creating high-capacity electrical energy storage devices. Although dielectrics are still inferior to ion batteries or supercapacitors in terms of stored energy density, they significantly outperform them in terms of charge or discharge rate, which allows significant power output to be achieved. In recent years, there has been a resurgence of interest in ferroelectric materials for energy storage devices. Research is focused on both the search for new materials and the optimization of their microstructure in order to increase the dielectric breakdown strength. In particular, relaxor ferroelectrics are of the greatest interest because of large recoverable energy storage density and low hysteresis losses.

This lecture will overview the requirements for dielectric materials for high energy storage and present our recent results on two different families of materials. One family includes ceramics based on environmentally friendly BaTiO₃-BaZrO₃ relaxor ferroelectrics. The alloying with BiMeO₃ (where Me = Zn²⁺, Nb⁵⁺, Ta⁵⁺, Y³⁺, etc.) tunes the electrical properties and promotes relaxor behavior. In addition, the chemical modification has an impact on the transition temperature and shifts the peak permittivity to the desired operating window near room temperature. We discuss the role of different Me-cations on the energy storage parameters and the dielectric breakdown strength.

The second family belong P(VDF-TrFE-CFE) polymer relaxor materials. Here we have studied the effect of the CFE content on the relaxor behavior and the energy storage performance. It is shown that in composites with P(VDF-TrFE-CFE) polymer matrix and BaZr0.2Ti0.8O3 dielectric inorganic nanofillers, a further increase in the stored energy density can be achieved. The mechanisms of this enhancement are discussed.