Author
Shun Guo
Bio: Shun Guo is an academic researcher from Nanjing University of Science and Technology. The author has contributed to research in topics: Ceramic & Dielectric. The author has an hindex of 1, co-authored 3 publications receiving 9 citations.
Topics: Ceramic, Dielectric, Materials science, Capacitor, Energy storage
Papers
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TL;DR: In this paper, a relaxor antiferroelectric NaNbO3-BiFeO3 bulk dielectric ceramics was constructed for advanced energy storage capacitors.
71 citations
TL;DR: In this article, the antiferroelectric NaNbO3 matrix was introduced into antiferromagnetic NaNiBO3 to form (Na1-3/2/2xBi3/ 2xNb1-xMgx)O3 solid solutions and the relaxor behavior was improved.
66 citations
TL;DR: In this paper , a stable relaxor antiferroelectric ceramics with enhanced relaxor behavior was proposed, which exhibits a large electric breakdown strength Eb of 87.3 kV/mm, an ultrahigh Wrec of 12.7 J/cm3, and a high efficiency η of 82.5%, as well as excellent thermal reliability and an ultrafast discharge speed.
Abstract: Dielectric capacitors have attracted growing attention because of their important applications in advanced high power and/or pulsed power electronic devices. Nevertheless, the synergistic enhancement of recoverable energy storage density (Wrec > 10 J/cm3) and efficiency (η > 80%) is still a great challenge for lead-free dielectric bulk ceramics. Herein, by introducing complex perovskite compound (Bi0.9Na0.1)(Fe0.8Ti0.2)O3 with a smaller tolerance factor into an NaNbO3 matrix (NN-BNFT), we have achieved and explored stable relaxor antiferroelectric ceramics with enhanced relaxor behavior. Of particular importance is the composition of 0.88NN-0.12BNFT, which exhibits a large electric breakdown strength Eb of 87.3 kV/mm, an ultrahigh Wrec of 12.7 J/cm3, and a high efficiency η of 82.5%, as well as excellent thermal reliability and an ultrafast discharge speed, resulting from the dense microstructure, the moderate dielectric constant, the reduced grain size, the dielectric loss, and the sample thickness. The outstanding energy storage properties of NN-BNFT display great promise in advanced dielectric capacitors for energy storage applications.
31 citations
TL;DR: In this paper, the 0.88NN-0.12BSFN (Bi0.8Sr0.2)(Fe0.9Nb0.1) relaxor antiferroelectric ceramics, which integrates the merits of antiferronelectrics and relaxors, are demonstrated to exhibit stabilized antiferric phase and enhanced dielectric relaxor behavior.
28 citations
TL;DR: In this paper , the synergistic contributions of high Pmax, small Pr and large Eb endow the BiFeO3-based ceramics with relaxor ferroelectric characteristics, due to which an ultrahigh Wrec of 13.9 J cm−3 and high η of 89.6% have been achieved synchronously.
Abstract: The synergistic contributions of high Pmax, small Pr and large Eb endow the BiFeO3-based ceramics with relaxor ferroelectric characteristics, due to which an ultrahigh Wrec of 13.9 J cm−3 and high η of 89.6% have been achieved synchronously.
20 citations
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TL;DR: In this article , the authors proposed a high-entropy strategy to design local polymorphic distortion including rhombohedral-orthorhombic-tetragonal-cubic multiphase nanoclusters and random oxygen octahedral tilt, resulting in ultrasmall polar nanoregions, an enhanced breakdown electric field, and delayed polarization saturation.
Abstract: Abstract Next-generation advanced high/pulsed power capacitors rely heavily on dielectric ceramics with high energy storage performance. However, thus far, the huge challenge of realizing ultrahigh recoverable energy storage density ( W rec ) accompanied by ultrahigh efficiency ( η ) still existed and has become a key bottleneck restricting the development of dielectric materials in cutting-edge energy storage applications. Here, we propose a high-entropy strategy to design “local polymorphic distortion” including rhombohedral-orthorhombic-tetragonal-cubic multiphase nanoclusters and random oxygen octahedral tilt, resulting in ultrasmall polar nanoregions, an enhanced breakdown electric field, and delayed polarization saturation. A giant W rec ~10.06 J cm −3 is realized in lead-free relaxor ferroelectrics, especially with an ultrahigh η ~90.8%, showing breakthrough progress in the comprehensive energy storage performance for lead-free bulk ceramics. This work opens up an effective avenue to design dielectric materials with ultrahigh comprehensive energy storage performance to meet the demanding requirements of advanced energy storage applications.
96 citations
TL;DR: In this paper, a relaxor antiferroelectric NaNbO3-BiFeO3 bulk dielectric ceramics was constructed for advanced energy storage capacitors.
71 citations
TL;DR: In this article , an ultrahigh recoverable energy density (Wrec) of 8.46 J/cm3 with excellent efficiency of 85.9% under 522 kV/cm is obtained in 0.90(Bi 0.5Na0.5)0.65Sr0.35TiO3-0.10
50 citations
TL;DR: In this article , a lead-free dielectric ceramics with ultrahigh energy storage performance was developed for next-generation high-power capacitors, achieving a record-breaking energy efficiency of 97.8% .
Abstract: Developing environmentally friendly lead-free dielectric ceramics with ultrahigh energy storage performance is fundamental to next-generation high-power capacitors but challenging as well. Herein, a record-breaking ultrahigh energy efficiency η of 97.8%...
38 citations
TL;DR: In this paper , a stable relaxor antiferroelectric ceramics with enhanced relaxor behavior was proposed, which exhibits a large electric breakdown strength Eb of 87.3 kV/mm, an ultrahigh Wrec of 12.7 J/cm3, and a high efficiency η of 82.5%, as well as excellent thermal reliability and an ultrafast discharge speed.
Abstract: Dielectric capacitors have attracted growing attention because of their important applications in advanced high power and/or pulsed power electronic devices. Nevertheless, the synergistic enhancement of recoverable energy storage density (Wrec > 10 J/cm3) and efficiency (η > 80%) is still a great challenge for lead-free dielectric bulk ceramics. Herein, by introducing complex perovskite compound (Bi0.9Na0.1)(Fe0.8Ti0.2)O3 with a smaller tolerance factor into an NaNbO3 matrix (NN-BNFT), we have achieved and explored stable relaxor antiferroelectric ceramics with enhanced relaxor behavior. Of particular importance is the composition of 0.88NN-0.12BNFT, which exhibits a large electric breakdown strength Eb of 87.3 kV/mm, an ultrahigh Wrec of 12.7 J/cm3, and a high efficiency η of 82.5%, as well as excellent thermal reliability and an ultrafast discharge speed, resulting from the dense microstructure, the moderate dielectric constant, the reduced grain size, the dielectric loss, and the sample thickness. The outstanding energy storage properties of NN-BNFT display great promise in advanced dielectric capacitors for energy storage applications.
31 citations