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Figure 2 Dielectric temperature and performance test of superparaelectric thin film
With funding from the National Natural Science Foundation of China (approval number: 51788104), the team of Academician Nan Cewen and Professor Lin Yuanhua of the School of Materials Science and Engineering of Tsinghua University and their collaborators have made progress in the field of dielectric energy storage research
.
The research results are titled "Ultrahigh energy storage in superparaelectric relaxor ferroelectrics" and will be published online in the journal Science on October 1, 2021
Dielectric capacitors are irreplaceable basic energy storage components in high-power pulse technology, which can realize instantaneous energy release and power amplification, and have major strategic needs in cutting-edge scientific research such as ultra-high power equipment
.
However, limited by the intrinsic electrical properties of key dielectric materials, the low energy density of dielectric capacitors has become a bottleneck restricting its development and application
The current research and development of relaxor ferroelectric materials are mainly focused on the T f ~ T m temperature region to achieve high polarization, but the loss caused by the high domain switching energy barrier in this temperature region severely restricts the improvement of energy storage performance
.
The research team proposes a new idea for designing energy storage dielectric materials in the superparaelectric state (T m ~ T B temperature region): temperature induction reduces the volume of the electrical domains in the relaxor ferroelectrics, weakens the coupling, and reduces the flipping energy barrier.
This super-paraelectric design breaks the conventional design ideas of relaxor ferroelectrics, and not only provides a new material design approach for the development of high-performance dielectric energy storage materials, but also opens up new ways for the polarization control of relaxor ferroelectrics.
