Relaxor regulation and improvement of energy storage properties of Sr2NaNb5O15-based tungsten bronze ceramics through B-site substitution

Cao, Lei; Yuan, Ying; Li, Enzhu; Zhang, Shuren

doi:10.1016/j.cej.2020.127846

Cited by 41 publications

(42 citation statements)

References 71 publications

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“…Consequently, an outstanding energy storage density value of 3.84 J/cm 3 with an excellent efficiency value of 93.2% is achieved simultaneously under an applied electric field of 410 kV/cm. A comparison of W rec and η values of the SKNT-0.8 ceramic and those reported in lead-based, ,,− Bi-based perovskite-based, ,,,− and Pb/Bi-free TB-based ,,, is shown in the Figure f. Apparently, the remarkable energy storage density and efficiency realized simultaneously in this study can be on a par with that of most Bi-based perovskite-based ceramics reported recently and are significantly superior than that of other TB-based ceramics, showing great advantages in potential high-power energy capacitor applications.…”

Section: Resultssupporting

confidence: 54%

“…Consequently, an outstanding energy storage density value of 3.84 J/cm 3 with an excellent efficiency value of 93.2% is achieved simultaneously under an applied electric field of 410 kV/cm. A comparison of W rec and η values of the SKNT-0.8 ceramic and those reported in lead-based, 10,15,50−52 Bi-based perovskitebased, 38,40,48,53−64 and Pb/Bi-free TB-based 7,22,27,65 is shown in the Figure 7f. Apparently, the remarkable energy storage In addition to a high W rec with excellent η, good stability is also an objectively important requirement for practical applications of energy storage capacitors.…”

Section: ■ Experimental Proceduresmentioning

confidence: 92%

“…28 Furthermore, they obtained a high W rec of 2.03 J/cm 3 and an excellent η of 94% by introducing Ta 5+ in B-sites of the SNN-based ceramic. 7 These studies indicated that superior energy storage performances can be acquired in the tungsten bronze structure RFE, which might be a potential candidate for Pb/Bi-free capacitors. Sr 2 KNb 5 O 15 (SKN) is a typical tetragonal tungsten bronze structure ferroelectric.…”

Section: ■ Introductionmentioning

confidence: 95%

“…Cao et al achieved a W rec of 1.36 J/cm 3 with an ultrahigh efficiency of 91.9% in the (Sr 0.7 Ba 0.3 ) 5 LaNb 7 Ti 3 O 30 ceramic . Furthermore, they obtained a high W rec of 2.03 J/cm 3 and an excellent η of 94% by introducing Ta 5+ in B-sites of the SNN-based ceramic . These studies indicated that superior energy storage performances can be acquired in the tungsten bronze structure RFE, which might be a potential candidate for Pb/Bi-free capacitors.…”

Section: Introductionmentioning

confidence: 98%

“…Current research studies on dielectric ceramics are almost focused on paraelectrics (PEs), ferroelectrics (FEs), relaxor ferroelectrics (RFEs), and antiferroelectrics (AFEs). Among these, RFEs possessing a higher dielectric constant, higher energy storage efficiency, excellent fatigue resistance, and product stability are identified as the most promising energy storage medium materials. − …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Wang

Zhang

et al. 2021

ACS Appl. Energy Mater.

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In this study, a Pb/Bi-free Sr2KNb5O15-based tungsten bronze relaxor ceramic system was developed for possible energy storage applications via the site engineering technology. The introduction of Ta at the Nb site enhanced the breakdown strength and relaxor nature of the Sr2KNb5O15 ceramic. An extremely high energy storage density (∼3.84 J/cm3) accompanied by a remarkable energy storage efficiency (∼93.2%) was obtained under an applied electric field of 410 kV/cm in the composition of Sr2KNb4.2Ta0.8O15. Meanwhile, the ceramic exhibited a relatively wide frequency stability (1–500 Hz) and thermal stability (30–120 °C) and displayed a remarkable fatigue endurance after 104 cycles. Even more surprisingly, the Sr2KNb4.2Ta0.8O15 ceramic processed excellent discharging performances with a short discharge time (τ0.9 < 75 ns), a large discharge current density (1019 A/cm2), and an amazing power density (125.6 MW/cm3). The impressive performances demonstrated that the Sr2KNb4.2Ta0.8O15 tungsten bronze ceramic might be a potential Pb/Bi-free dielectric material for high-power pulse capacitor applications.

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Section: Resultssupporting

confidence: 54%

“…Consequently, an outstanding energy storage density value of 3.84 J/cm 3 with an excellent efficiency value of 93.2% is achieved simultaneously under an applied electric field of 410 kV/cm. A comparison of W rec and η values of the SKNT-0.8 ceramic and those reported in lead-based, 10,15,50−52 Bi-based perovskitebased, 38,40,48,53−64 and Pb/Bi-free TB-based 7,22,27,65 is shown in the Figure 7f. Apparently, the remarkable energy storage In addition to a high W rec with excellent η, good stability is also an objectively important requirement for practical applications of energy storage capacitors.…”

Section: ■ Experimental Proceduresmentioning

confidence: 92%

Section: ■ Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Wang

Zhang

et al. 2021

ACS Appl. Energy Mater.

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Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

Gao,

Qiao,

Lou

et al. 2023

Advanced Materials

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Dielectric energy‐storage capacitors, known for their ultrafast discharge time and high‐power density, find widespread applications in high‐power pulse devices. However, ceramics featuring a tetragonal tungsten bronze structure (TTBs) have received limited attention due to their lower energy‐storage capacity compared to perovskite counterparts. Herein, a TTBs relaxor ferroelectric ceramic based on the Gd0.03Ba0.47Sr0.485‐1.5xSmxNb2O6 composition, exhibiting an ultrahigh recoverable energy density of 9 J cm−3 and an efficiency of 84% under an electric field of 660 kV cm−1 is reported. Notably, the energy storage performance of this ceramic shows remarkable stability against frequency, temperature, and cycling electric field. The introduction of Sm3+ doping is found to create weakly coupled polar nanoregions in the Gd0.03Ba0.47Sr0.485Nb2O6 ceramic. Structural characterizations reveal that the incommensurability parameter increases with higher Sm3+ content, indicative of a highly disordered A‐site structure. Simultaneously, the breakdown strength is also enhanced by raising the conduction activation energy, widening the bandgap, and reducing the electric field‐induced strain. This work presents a significant improvement on the energy storage capabilities of TTBs‐based capacitors, expanding the material choice for high‐power pulse device applications.

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

Peng

Liu

et al. 2023

Advanced Science

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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 Sr0.425La0.1□0.05Ba0.425Nb1.4Ta0.6O6 (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 (t0.9 = 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.

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Relaxor regulation and improvement of energy storage properties of Sr2NaNb5O15-based tungsten bronze ceramics through B-site substitution

Cited by 41 publications

References 71 publications

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Pb/Bi-free Tungsten Bronze-Based Relaxor Ferroelectric Ceramics with Remarkable Energy Storage Performance

Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

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

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