Superior Energy Density Achieved in Unfilled Tungsten Bronze Ferroelectrics via Multiscale Regulation Strategy

Haonan Peng; Zhen Liu; Zhengqian Fu; Kai Dai; Zhongqian Lv; Shaobo Guo; Zhigao Hu; Fangfang Xu; Genshui Wang

doi:10.1002/advs.202300227

Superior Energy Density Achieved in Unfilled Tungsten Bronze Ferroelectrics via Multiscale Regulation Strategy

Adv Sci (Weinh). 2023 Jun;10(17):e2300227. doi: 10.1002/advs.202300227. Epub 2023 Apr 21.

Authors

Haonan Peng^{1

2}, Zhen Liu¹, Zhengqian Fu³, Kai Dai⁴, Zhongqian Lv^{1

2}, Shaobo Guo¹, Zhigao Hu⁴, Fangfang Xu³, Genshui Wang^{1

2

5}

Affiliations

¹ Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, 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 Technical Center for Multifunctional Magneto-Optical Spectroscopy (Shanghai), Engineering Research Center of Nanophotonics & Advanced Instrument (Ministry of Education), Department of Materials, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, P. R. China.
⁵ School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, P. R. China.

Abstract

The most promising candidates for energy storage capacitor application are relaxor ferroelectrics, among which, the perovskite structure ferroelectric ceramics have witnessed great development progress. However, less attention has been paid on tetragonal tungsten bronze structure (TTBS) ceramics because of their lower breakdown strength and polarization. Herein, a multiscale regulation strategy is proposed to tune the energy storage performances (ESP) of TTBS ceramics from grain, domain, and macroscopic scale. The enhanced relaxor behavior with dynamic polar nanodomains guarantees low remanent polarization, while the refined grains and enlarged bandgap ensure increased breakdown strength. Hence, excellent ESP is realized in unfilled TTBS Sr_0.425 La_0.1 □_0.05 Ba_0.425 Nb_1.4 Ta_0.6 O₆ (SLBNT) ceramics with an ultrahigh recoverable energy density of 5.895 J cm^-3 and a high efficiency of 85.37%. This achievement notably surpasses previous studies in TTBS ceramics and is comparable to that of perovskite components. Meanwhile, the energy density exhibits a wide temperature, frequency, and cycling fatigue stability. In addition, high power density (257.89 MW cm^-3 ), especially the ultrafast discharge time (t_0.9 = 16.4 ns) are achieved. The multiscale regulation strategy unlocks the energy storage potential of TTBS ceramics and thus highlights TTBS ceramics as promising candidates for energy storage, like perovskite structured ceramics.

Keywords: charge-discharging; energy storage density; multiscale regulation strategy; polar nanoregion; tungsten bronze ferroelectrics.

Publication types

Research Support, Non-U.S. Gov't

Abstract

Publication types

Grants and funding