Contacts
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International
| HiEnFe – Výskum a vývoj vysokoentropických feroelektrických materiálov pre uskladnenie elektrickej energie | |
| Research and development of high-entropy ferroelectric materials for energy storage | |
| Program: | Bilateral – other |
| Project leader: | RNDr. Kovaľ Vladimír, DrSc. |
| Annotation: | The main goal of the proposed project is to establish and develop a scientific cooperation between Slovakia and China in the field of ferroelectric materials for energy storage applications. Joining of the research teams from both countries is motivated not only because of great technological potential of the ferroelectrics but also due to the fascinating physics behind their energy storage properties. Dielectrics play an important role in high-power energy storage applications, such as electromagnetic devices and hybrid electric vehicles, due to their fast charge-discharge capability. However, dielectric capacitors, although presenting faster charging/discharging rates and better stability compared with supercapacitors or Li-ion batteries, are limited in applications due to their relatively low energy density. To date, the best materials for dielectric capacitors are ferroelectrics based on lead-containing oxides. Toxicity of lead and environmental concerns, however, have prompted the search for lead-free alternatives. In the proposed collaborative research, we will employ the high entropy concept to develop novel lead-free ferroelectrics for effective energy storage in next generation dielectric capacitors. Recently, we have demonstrated that the energy density and efficiency of high-entropy ferroelectrics can be substantially improved by texturing their microstructure and optimizing the field-induced phase transitions. However, the origin of reversible phase transitions and enhanced energy storage performance in these modern high-entropy functional materials still needs a proper interpretation and confirmation from detailed experimental studies. Our aim is to combine research on relaxor ferroelectrics in Slovakia with activities in China focused on innovative technique of templated grain growth of electroceramics and develop lead-free highly textured ferroelectric ceramics with excellent properties for high-power energy storage applications. |
| Duration: | 1.7.2024 – 30.6.2026 |
National
| Povrchové inžinierstvo práškových feromagnetických častíc a štruktúra magneticky mäkkých kompozitov | |
| Surface engineering of powder ferromagnetic particles and structure of soft magnetic composites | |
| Program: | VEGA |
| Project leader: | Ing. Bureš Radovan, CSc. |
| Annotation: | The project deals with SMC based on powdered ferromagnetics and electro-insulating ceramics in the form of a continuous network. The research of such materials applied in the field of energy conversion is motivated by increasing performance and efficiency, which is achieved by increasing the working frequency of magnetization. The project aims to investigate the structure of ferromagnetic and dielectric particle interfaces, their influence on the formation of microstructure and the functional properties of compacted SMC materials with a focus on the frequency stability of electromagnetic properties. The high variability of the geometrical characteristics of ferromagnetic microparticles and modifications in the distribution of ceramic nanoparticles provide a large scope for increasing the frequency stability of the functional properties of the composite. The analysis of interphases, structural discontinuities and compaction mechanisms will contribute to clarifying the evolution of electromagnetic properties. |
| Duration: | 1.1.2024 – 31.12.2026 |