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Xi'an Jiaotong University researchers have made important progress in the field of dielectric energy storage capacitors
[ China Instrument Network Instrument Development ] With the continuous development of science and technology and the intensification of the energy crisis, new energy technology has become a hotspot in the research of industry and academia, and energy storage technology has received strong attention as an important part.
Among various energy storage technologies, dielectric energy storage capacitors have broad application prospects in the field of electrical energy storage due to their superior power density, extremely fast charge and discharge speed and low manufacturing cost. Energy storage density, efficiency and thermal stability are important parameters for measuring and evaluating the performance of dielectric storage capacitors. How to develop a dielectric energy storage capacitor with excellent comprehensive energy storage performance and good thermal stability has become a difficult research problem that needs to be overcome.
Recently, Professor Wang Hong from the School of Microelectronics, Xi'an Jiaotong University developed a design of BaTiO3-Bi(Mg0.5Zr0.5)O3 with high energy storage density, high energy storage efficiency and excellent thermal stability through domain engineering control. Lead-free relaxation ferroelectric energy storage materials. In this work, the effects of Bi(Mg0.5Zr0.5)O3 addition on the crystal structure, grain size, dielectric properties, macroscopic polarization state and breakdown field strength of BaTiO3 matrix materials were systematically studied on multiple scales. In particular, the deep exploration of the domain structure and electric field dynamics of BaTiO3-Bi(Mg0.5Zr0.5)O3 system at nanometer scale provides a theoretical basis for the study of relaxation ferroelectric energy storage materials. In the end, Prof. Wang Hong’s research group obtained a storage density of 2.9J×cm-3 and an energy storage efficiency of 86.8% in BaTiO3-Bi(Mg0.5Zr0.5)O3 lead-free relaxed iron material. Optimal integrated energy storage performance in lead-free ceramic materials. At the same time, the material exhibits excellent thermal stability over a temperature range of 30 to 150 °C.
The above research results were published online in the internationally renowned journal Nano Energy (IF=13.12) under the title "Simultaneously achieved temperature-insensitive high energy density and efficiency in domain engineered BaTiO3-Bi(Mg0.5Zr0.5)O3lead-free relaxor ferroelectrics". Yuan Qibin, Ph.D. student of Xi'an Jiaotong University, is the first author of this article. Professor Wang Hong and Dr. Yao Fangzhou are the co-authors of this article. Xi'an Jiaotong University is the first signatory of this article. Tsinghua University and Southern University of Science and Technology are the cooperation units of this paper. This research work is another important achievement of Professor Wang Hong's research group in the field of dielectric energy storage, published in Advanced Materials, Advanced Functional Materials, Nano Energy, Journal of Materials Chemistry A and other internationally renowned journals.
The research was supported by the National Natural Science Foundation of China, the national “973†project, and national key R&D projects.
(Original title: Researchers at Xi'an Jiaotong University have made significant progress in the field of dielectric energy storage capacitors)