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Polymer composite dielectrics are in high demand for applications in various electric vehicles and power systems due to their high energy density, high efficiency and high temperature stability. However, it is a major challenge to design high-performance nanofillers that benefit both polarization and breakdown strength.
In view of this, Prof. Yuanhua Lin from Academician Ce-Wen Nan's team at Tsinghua University has prepared high-entropy-induced ceramic nanofibers with stabilized Bi2Ti2O7 pyrochlore phase by using the electrospinnig machine technique. The related research results were published in the journal Advanced Energy Materials under the title of “High-Entropy-Nanofibers Enhanced Polymer Nanocomposites for High-Performance Energy Storage”. Advanced Energy Materials
1. In this paper, a novel high-entropy Electrospun Nanofbers reinforced polymer nanocomposites are investigated for high-performance energy storage applications.
2. By controlling the electrospimnimg system engineering, the dielectric constant and breakdown strength of the material were successfully improved, resulting in high energy density and excellent thermal stability.
3. A high energy density of 6.46 J cm-3 was achieved under an electric field of 590 MV m-1 at 150°C, which is superior to most reported PEI composites.
4. These properties allow the material to remain stable in high-temperature environments, providing a new solution for next-generation electric vehicle and aerospace power systems.
High Entropy Electrospun Nanofbers are inorganic nanofillers designed using an entropy engineering approach. The approach involves the introduction of multiple elements into the material in equimolar proportions, resulting in highly disordered and unique microstructures. In this study, high-entropy Electrospun Nanofbers were designed using a combination of Zr, Hf, and Sn, and were found to have a stable linear syenite phase and relatively high dielectric constant.
All the nanofillers were prepared by electrospinnig machine.
1. A stabilized electrostatic spinning precursor solution was obtained by dissolving the inorganic material in a co-solvent. In order to ensure the spinnability of the precursor solution, polyvinylpyrrolidone (PVP, Mw = 130 W) at a concentration of 8 wt % was used.
2. After electrostatic spinning according to the set parameters, the precursor Electrospun Nanofbers with randomly distributed structure were obtained.
3. The precursor Electrospun Nanofbers were calcined in air at 600 °C at a rate of 2 °C min - 1 to decompose all the PVP, thus obtaining the ceramic Electrospun Nanofbers.
When these Electrospun Nanofbers are added to the polymer matrix, their scientific research effectively improves the dielectric constant and breakdown strength of the composite, resulting in higher energy density. In addition, the high entropy Electrospun Nanofbers improve the thermal stability of the polymer nanocomposites, making them suitable for high-temperature applications. Overall, the use of high-entropy Electrospun Nanofbers is a promising approach to develop high-performance polymer nanocomposites for energy storage applications.
Originallink: https://doi.org/10.1002/aenm.202203925
