Microstructure evolution, mechanism of electric breakdown strength, and dielectric energy storage performance of CuO modified Ba0.65Sr0.245Bi0.07TiO3 Pb-free bulk ceramics

Liu, Gang; Li, Yang; Dong, Jia; Yu, Linjiang; Zhang, Yutong; Hu, Jinzhu; Gao, Jinghui; He, Zhanbing

doi:10.1016/j.ceramint.2019.07.148

Cited by 37 publications

(6 citation statements)

References 80 publications

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“…Combining these results with the corresponding loss spectrum, it is concluded that grain boundary conductivity plays a dominant role in these materials. 51 With increasing doping amount, the ac complex impedance diagrams of the NN−BNT ceramics are similar to the Debye semicircle, indicating that the NN−BNT ceramics have a single response mechanism; this suggests that there is only a single grain boundary conductance in the ceramics, which is verified by the single peak of the corresponding loss spectrum. 52,53 The Z″/Z max ″ ratio of the (1 − x)NN−xBNT ceramics was investigated as a function of frequency at the temperatures from 520 to 600 °C.…”

Section: ■ Experimental Sectionmentioning

confidence: 71%

Ultrahigh Energy Storage Characteristics of Sodium Niobate-Based Ceramics by Introducing a Local Random Field

Pang

Chen

Sun

et al. 2020

ACS Sustainable Chem. Eng.

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Lead-free ceramic capacitors are widely applied for novel pulse power supply systems owing to their environmental friendliness, high power density, and fast charge−discharge characteristics. Nevertheless, the simultaneous achievement of a higher recoverable energy storage density (W rec ) and efficiency (η) is still challenging and must be investigated. To obtain a dielectric capacitor with a high W rec and η, the energy storage characteristics can be improved by reducing the residual polarization and increasing the breakdown strength. In this work, the doping modification of the NaNbO 3 (NN) ceramics is used to produce a local random field to improve the electrical breakdown strength, obtaining a lead-free dielectric capacitor with high energy storage characteristics. According to this strategy, Bi(Ni 0.67 Ta 0.33 )O 3 is added to NN, and an ultrahigh E b is obtained so that the ceramics have ideal W rec and η values. 0.85NN−0.15Bi(Ni 0.67 Ta 0.33 )O 3 has a very high W rec (5.53 J cm −3 ) and η (82.0%) at 575 kV cm −1 . Furthermore, the energy storage characteristics of the ceramics exhibit good thermal stability and frequency stability that are superior to those of most of the lead-free dielectric capacitors reported to date. In particular, the 0.85NN−0.15 Bi 0.5 Na 0.5 TiO 3 (0.85NN−0.15BNT) ceramic also allows an ultrafast discharge time (t 0.9 = 27.5 ns), large current density (C D = 506.42 A cm −2 ), and higher power density (P D = 35.45 mW cm −3 ). These results indicate that (1 − x)NN−xBNT ceramics are promising for applications in lead-free dielectric ceramic capacitors with a high energy storage density and conversion efficiency.

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Section: ■ Experimental Sectionmentioning

confidence: 71%

Ultrahigh Energy Storage Characteristics of Sodium Niobate-Based Ceramics by Introducing a Local Random Field

Pang

Chen

Sun

et al. 2020

ACS Sustainable Chem. Eng.

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“…The η is almost unchanged, stable at more than 91.4%. We also compared the stability of ESP with other BT‐based ceramics in Figure 7F 53–58 . The BB PVRP ceramics are competitive and can maintain a higher W rec under a broad temperature region.…”

Section: Resultsmentioning

confidence: 99%

Simultaneously achieving high energy storage performance and low electrostrictive strain in BT‐based ceramics

et al. 2023

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Dielectric ceramics with high recoverable energy storage density (Wrec) and high energy storage efficiency (η) are urgently needed due to their potential application in pulse capacitor devices. However, the low η and breakdown strength (BDS) have produced a bottleneck for achieving high Wrec at high electric field. Here, we introduce Bi(Mg0.5Ti0.5)O3 (BMT) into Ba(Ti0.92Sn0.08)O3 (BTS) matrix to enhance the relaxor character of BTS–xBMT and reduce the electrostrictive strain generated during electric field loading. The enhanced relaxor character is beneficial for increasing the efficiency, whereas the reduced electrostrictive strain is profitable to increase the BDS. Furthermore, the BDS is significantly improved by the polymer viscous rolling process. Finally, the electrostrictive effect was considerably lowered in an optimized BTS–0.1BMT composition. More crucially, a high Wrec of 4.34 J/cm3 was attained accompanied by excellent temperature stability (variation ≤±5% between 30 and 120°C). The current results show that the developed dielectric ceramics can be used in pulse capacitor devices for energy storage.

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“…On the other hand, DNNT30 ceramics had the smallest Z max value in the series; relating this to XRD, we can without hesitation conclude that this is because of the existence of a secondary phase in this composition. This is due to the presence of free carrier charges and impurities at the grain boundaries, which influence the electrical conductivity, thereby reducing its resistivity. , At a high frequency, the second semicircle is very weak, which indicates the dominance of the grain boundary contributions in conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the presence of free carrier charges and impurities at the grain boundaries, which influence the electrical conductivity, thereby reducing its resistivity. 56,57 At a high frequency, the second semicircle is very weak, which indicates the dominance of the grain boundary contributions in conductivity. Figure 8a−c demonstrates the overdamped discharge current curves and discharge energy density (W d ) curves for DNNT20 ceramics at different electric field supplies.…”

Section: ■ Introductionmentioning

confidence: 99%

Significantly Enhanced Energy Storage Density of NNT Ceramics Using Aliovalent Dy³⁺ Dopant

Emmanuel

Hao

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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Sodium niobate (NN)-based lead-free ceramic Dy x Na 1−x (Nb 0.9 Ta 0.1 )O 3 denoted as (DNNT) x = 0, 0.05, 0.1, 0.2, and 0.3 was synthesized via a conventional solid-state method to achieve bulk lead-free dielectric ceramics having an improved energy storage capability that can conceivably be used in pulsed power technology. The addition of Dy 3+ broadened the phase transition peak, thereby strengthening the relaxor properties of the DNNT ceramic materials. The sample's microstructure was explored using a scanning electron microscope, and its corresponding phase structure via X-ray diffraction (XRD). A systematic study was carried out for energy storage properties of 0.2 mol of Dy 3+ (DNNT20) where a recoverable energy storage density (W rec ) of 4.61 J cm −3 with a breakdown strength (BDS) of 478 kV cm −1 and an energy storage efficiency (η) of ≈84% were achieved. Additionally, the DNNT20 ceramics displayed comparatively reasonable temperature stability (20−140 °C), excellent frequency stability (0.1−100 Hz), and also fast charge−discharge speed (≤0.5 μs). Thus, the DNNT20 ceramic materials can be of probable use for future energy storage applications.

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Microstructure evolution, mechanism of electric breakdown strength, and dielectric energy storage performance of CuO modified Ba0.65Sr0.245Bi0.07TiO3 Pb-free bulk ceramics

Cited by 37 publications

References 80 publications

Ultrahigh Energy Storage Characteristics of Sodium Niobate-Based Ceramics by Introducing a Local Random Field

Ultrahigh Energy Storage Characteristics of Sodium Niobate-Based Ceramics by Introducing a Local Random Field

Simultaneously achieving high energy storage performance and low electrostrictive strain in BT‐based ceramics

Significantly Enhanced Energy Storage Density of NNT Ceramics Using Aliovalent Dy³⁺ Dopant

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Microstructure evolution, mechanism of electric breakdown strength, and dielectric energy storage performance of CuO modified Ba0.65Sr0.245Bi0.07TiO3 Pb-free bulk ceramics

Cited by 37 publications

References 80 publications

Ultrahigh Energy Storage Characteristics of Sodium Niobate-Based Ceramics by Introducing a Local Random Field

Ultrahigh Energy Storage Characteristics of Sodium Niobate-Based Ceramics by Introducing a Local Random Field

Simultaneously achieving high energy storage performance and low electrostrictive strain in BT‐based ceramics

Significantly Enhanced Energy Storage Density of NNT Ceramics Using Aliovalent Dy3+ Dopant

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Significantly Enhanced Energy Storage Density of NNT Ceramics Using Aliovalent Dy³⁺ Dopant