Researchers of Xi'an Jiaotong University have made important progress in the field of dielectric energy storage capacitors
With the in-depth development of the global social economy, the energy crisis is intensifying, and the development and utilization of new energy technologies have become the key to the development of human society. As an important energy storage device, dielectric energy storage capacitors have great advantages in power density, charge and discharge rate, and service life. However, due to factors such as low energy storage density, their further promotion and application are greatly limited. The energy storage density of dielectric capacitors is mainly affected by two factors, polarization strength and breakdown field strength, and there is also an inverse relationship between the two. Therefore, cracking the inverted relationship between polarization strength and breakdown field strength in dielectric materials has become a top priority for the development of high-performance dielectric energy storage capacitors.
From the perspective of bionic engineering, Prof. Wang Hong’s research group designed and developed an energy storage ceramic material with a multi-level core-shell structure with a raspberry-like shape in BaTiO3-Bi(Mg0.5Zr0.5)O3 matrix. A traditional core-shell structured composite ceramic with a breakdown field strength enhancement strategy at the cost of partial polarization strength was successfully achieved, and the collaborative optimization of polarization strength and breakdown field strength was successfully achieved, thereby achieving a great increase in energy storage density. This work explores the internal relationship between the interface composition, distribution state and macroscopic performance (polarization strength, breakdown field strength) of nano-scale raspberry-like structure composite ceramics, and combined with finite element simulation technology to break down The dynamic and intuitive analysis of the process deeply reveals the enhancement mechanism of the structure to the energy storage performance. In the end, the energy storage density of 3.41J/cm3 and the energy storage efficiency of 85.1% were obtained in the BT-BMZ-based all-inorganic raspberry structure nanocomposite, and the energy storage performance in the temperature range of 30~150℃ was achieved. High stability.
The above research results were published in the internationally renowned journal Advanced Functional Materials (IF=15.62) under the title of "Bioinspired hierarchically structured all-inorganic nanocomposites with significantly improved capacitive performance", and were selected as the back cover. Yuan Qibin, the doctoral student of Xi'an Jiaotong University's Functional Materials Research Center, is the first author of this article, Professor Wang Hong and Dr. Yao Fangzhou are the co-corresponding authors of this article, Xi'an Jiaotong University is the first author and first communication unit of this article, Southern University of Science and Technology, Tsinghua University The university and Penn State University in the United States are the cooperative units of this article. This research work is another important achievement after Prof. Wang Hong’s research group published a number of research results in the field of dielectric energy storage in Advanced Materials, Nano Energy, Journal of Materials Chemistry A and other internationally renowned journals.
The research was supported by projects such as the National Key R&D Program and the National Natural Science Foundation of China.
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