Supercritical Relaxor Nanograined Ferroelectrics for Ultrahigh-Energy-Storage Capacitors

Aiwen Xie; Jian Fu; Ruzhong Zuo; Xuewen Jiang; Tianyu Li; Zhengqian Fu; Yuewei Yin; Xiaoguang Li; Shujun Zhang

doi:10.1002/adma.202204356

Supercritical Relaxor Nanograined Ferroelectrics for Ultrahigh-Energy-Storage Capacitors

Adv Mater. 2022 Aug;34(34):e2204356. doi: 10.1002/adma.202204356. Epub 2022 Jul 19.

Authors

Aiwen Xie¹, Jian Fu¹, Ruzhong Zuo², Xuewen Jiang², Tianyu Li², Zhengqian Fu^{3

4}, Yuewei Yin⁵, Xiaoguang Li⁵, Shujun Zhang⁶

Affiliations

¹ Institute of Electro Ceramics & Devices, School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, P. R. China.
² Center for Advanced Ceramics, School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, 241000, P. R. China.
³ State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
⁴ Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
⁵ Hefei National Laboratory for Physical Sciences at the Microscale, Department of Physics, and CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, 230026, P. R. China.
⁶ Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, New South Wales, 2500, Australia.

PMID: 35766453
DOI: 10.1002/adma.202204356

Abstract

Supercritical relaxor nanograined ferroelectrics are demonstrated for high-performance dielectric capacitors, showing record-high overall properties of energy density ≈13.1 J cm^-3 and field-insensitive efficiency ≈90% at ≈74 kV mm^-1 and superior charge-discharge performances of high power density ≈700 MW cm^-3 , high discharge energy density ≈6.67 J cm^-3 , and ultrashort discharge time <40 ns at 55 kV mm^-1 . Ex/in situ transmission electron microscopy, Raman spectroscopy, and synchrotron X-ray diffraction provide clear evidence of the supercritical behavior in (Na,K)(Sb,Nb)O₃ -SrZrO₃ -(Bi_0.5 Na_0.5 )ZrO₃ ceramics, being achieved by engineering the coexistence of multiple local symmetries within the ergodic relaxor zone. The vanished difference between the ground relaxor state and the high-field supercritical state eliminates polarization hysteresis. The supercritical evolution with electric field enables a highly delayed polarization saturation with continuously increased polarization magnitudes. The results demonstrate that such a design strategy of compositionally induced and field-manipulated supercritical behavior can be generalizable for developing desirable energy-storage dielectrics for applications in ceramic/film capacitors.

Keywords: energy-storage capacitors; ex/in situ multiscale structure evolution; lead-free relaxor ferroelectrics; nanograins; supercritical behavior.

Abstract

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