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Journal ArticleDOI: 10.1039/D0TA11022A

Excellent energy storage properties and stability of NaNbO3–Bi(Mg0.5Ta0.5)O3 ceramics by introducing (Bi0.5Na0.5)0.7Sr0.3TiO3

02 Mar 2021-Journal of Materials Chemistry (The Royal Society of Chemistry)-Vol. 9, Iss: 8, pp 4789-4799
Abstract: NaNbO3-based (NN) energy storage ceramics exhibit high breakdown electric field strength (Eb) with large recoverable energy storage density (Wrec). However, due to their large energy loss density (Wloss) under strong electric fields, maintaining high energy storage efficiency (η) is a challenge. In this study, to produce a dielectric ceramic with both high Wrec and η, a ternary system was designed. By the addition of (Bi0.5Na0.5)0.7Sr0.3TiO3 (BNST), the grain size of 0.90NaNbO3–0.10Bi(Mg0.5Ta0.5)O3 (0.10BMT) was effectively reduced, and the long-range ordered structure was broken, providing an easily turned over dielectric domain to inhibit Wloss. The activation energy of the grain boundary increased with the increase in resistivity, indicating that the concentration of free vacancies at the grain boundary was low. The jump barrier of oxygen vacancies in the grain boundary increased, making up for the grain boundary defects, thus increasing Eb. When the BNST concentration increased, the Eb and Wrec of the dielectric ceramics increased. Optimum performance was obtained with the 0.75[0.90NaNbO3–0.10Bi(Mg0.5Ta0.5)O3]–0.25(Bi0.5Na0.5)0.7Sr0.3TiO3 (0.25BNST) ceramic, which exhibited an exceptionally high Eb (800 kV cm−1) and Wrec (8 J cm−3), while maintaining a relatively high η (90.4%). The ceramics developed in this study showed excellent temperature and frequency stability over 20–200 °C and 1–160 Hz, respectively. In addition, the dielectric properties of the ceramics were maintained after 10 000 hysteresis cycles. The 0.25BNST ceramic showed an exceptionally fast t0.9 (∼32 ns) and a high CD (614.5A cm−2). This study demonstrates that the energy storage performance and stability of the fabricated 0.25BNST ceramic are superior to those of previously reported dielectric ceramics.

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Topics: Dielectric (54%), Grain boundary (53%), Ceramic (53%) ... show more

17 results found

Open accessJournal ArticleDOI: 10.1021/ACS.CHEMREV.0C01264
Ge Wang1, Zhilun Lu1, Zhilun Lu2, Yong Li3  +8 moreInstitutions (7)
26 May 2021-Chemical Reviews
Abstract: Materials exhibiting high energy/power density are currently needed to meet the growing demand of portable electronics, electric vehicles and large-scale energy storage devices. The highest energy densities are achieved for fuel cells, batteries, and supercapacitors, but conventional dielectric capacitors are receiving increased attention for pulsed power applications due to their high power density and their fast charge-discharge speed. The key to high energy density in dielectric capacitors is a large maximum but small remanent (zero in the case of linear dielectrics) polarization and a high electric breakdown strength. Polymer dielectric capacitors offer high power/energy density for applications at room temperature, but above 100 °C they are unreliable and suffer from dielectric breakdown. For high-temperature applications, therefore, dielectric ceramics are the only feasible alternative. Lead-based ceramics such as La-doped lead zirconate titanate exhibit good energy storage properties, but their toxicity raises concern over their use in consumer applications, where capacitors are exclusively lead free. Lead-free compositions with superior power density are thus required. In this paper, we introduce the fundamental principles of energy storage in dielectrics. We discuss key factors to improve energy storage properties such as the control of local structure, phase assemblage, dielectric layer thickness, microstructure, conductivity, and electrical homogeneity through the choice of base systems, dopants, and alloying additions, followed by a comprehensive review of the state-of-the-art. Finally, we comment on the future requirements for new materials in high power/energy density capacitor applications.

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Topics: Capacitor (65%), Energy storage (62%), Dielectric (58%) ... show more

33 Citations

Journal ArticleDOI: 10.1016/J.CEJ.2021.130130
Jie Jiang1, Xiangjun Meng2, Ling Li3, Ji Zhang1  +5 moreInstitutions (4)
Abstract: Lead-free ceramic-based dielectric capacitors have attracted extensive investigation due to their potential applications in pulsed power devices. However, the main drawback of dielectric ceramics is the relatively low energy storage density. Herein, Bi3+ and Mg2+ with different ionic radius and valence are introduced into antiferroelectric NaNbO3 matrix to form (Na1-3/2xBi3/2x)(Nb1-xMgx)O3 solid solutions, where the antiferroelectric phase is stabilized and the relaxor behavior is also improved. Of particular importance is that a large breakdown strength (Eb) of 78.3 kV/mm, an ultrahigh recoverable energy density (Wrec) of 10.9 J/cm3 and efficiency (η) of 83% are simultaneously achieved in (Na0.91Bi0.09)(Nb0.94Mg0.06)O3 ceramic. Moreover, the energy storage properties of (Na0.91Bi0.09)(Nb0.94Mg0.06)O3 ceramic also reveals superior frequency (1–100 Hz), cycling (100–105) and thermal (30°C–100°C) stability, together with the ultrafast discharge rate (

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Topics: Ceramic (56%), Dielectric (53%), Energy storage (52%) ... show more

8 Citations

Journal ArticleDOI: 10.1021/ACSAMI.1C05824
Ruirui Kang1, Zepeng Wang1, Wenyuan Liu1, Liqiang He1  +5 moreInstitutions (1)
Abstract: Dielectric energy storage materials are becoming increasingly popular due to their potential superiority, for example, excellent pulse performance as well as good fatigue resistance. Although numerous studies have focused on lead-free dielectric materials which possess outstanding energy storage characteristics, the results are still not satisfying in terms of achieving both large discharging energy density (Wd) and high discharging efficiency (η) under low electric fields, which is crucial to be conducted in miniatured electronic components. Here, we adopt the strategy of domain engineering to develop sodium bismuth titanate (Bi0.5Na0.5TiO3)-based ceramics employed in the low-field situation. Remarkably, a large Wd of 2.86 J/cm3 and an ultrahigh η of 90.3% are concurrently obtained in 0.94(Bi0.5Na0.5)0.65(Ba0.3Sr0.7)0.35TiO3-0.06 Bi(Zn2/3Nb1/3)O3 system when the electric field is as low as 180 kV/cm. Additionally, the ceramic shows brilliant thermal endurance (20-160 °C) and frequency stability (0.1-100 Hz) with high Wd (>1.48 J/cm3) together with an ultra-high η (>90%). What's more, the ceramic displays a fast charge-discharge time (t0.9 = 109.2 ns). The piezoresponse force microscopy (PFM) results reveal that the introduced Bi(Zn2/3Nb1/3)O3 disrupts the microdomains of (Bi0.5Na0.5)0.65(Ba0.3Sr0.7)0.35TiO3 ceramics and promotes the formation of nanodomains, leading to enhanced energy storage properties. The current work may arouse interest in developing low-field high-performing dielectric capacitors for energy storage application.

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Topics: Dielectric (55%), Energy storage (55%), Capacitor (51%) ... show more

6 Citations

Journal ArticleDOI: 10.1016/J.ENSM.2021.09.018
Jie Jiang1, Xiangjun Meng2, Ling Li3, Shun Guo1  +6 moreInstitutions (4)
Abstract: Dielectric capacitors have drawn growing attention for their wide application in future high power and/or pulsed power electronic systems. However, the recoverable energy storage density (Wrec) for dielectric ceramics is relatively low up to now, which largely restricts their actual application. Herein, the domain engineering is employed to construct relaxor antiferroelectric NaNbO3-BiFeO3 bulk ceramics, which integrates the merits of antiferroelectrics and relaxors. It is revealed that the antiferroelectric phase transforms from orthorhombic P to R phase, and antiferroelectric domain evolves from micron-sized blocks to nanoscale clusters. Of particular importance is that the 0.90NaNbO3–0.10BiFeO3 ceramic demonstrates ultrahigh Wrec of 18.5 J cm−3 with giant electric breakdown strength of 99.5 kV mm−1, which is superior than state-of-the-art bulk dielectric ceramics. Moreover, the 0.90NaNbO3–0.10BiFeO3 ceramic exhibits superior frequency, cycling and thermal reliability, as well as the substantial current density (2140.6 A cm−2), ultrahigh power density (428.1 MW cm−3) and ultrafast discharge rate (14 ns). These results not only suggest that the NaNbO3-based relaxor antiferroelectric ceramics are promising candidates for advanced energy storage capacitors, but also provide feasible strategy of domain engineering to develop novel lead-free high-performance dielectric materials.

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Topics: Dielectric (54%), Capacitor (52%), Ceramic (50%)

1 Citations

Open accessJournal ArticleDOI: 10.1016/J.CEJ.2021.133584
Yangfei Gao1, Xiaopei Zhu1, Bian Yang1, Peng Shi1  +6 moreInstitutions (1)
Abstract: Ferroelectric ceramics, as a potential candidate for high-power energy storage capacitors, lies in their excellent recoverable energy storage density (Wrec) and outstanding efficiency (η) in practical applications. Herein, a new type of lead-free ceramics (1-x)(Na0.5Bi0.5)0.65Sr0.35TiO3-xBiMg0.5Sn0.5O3 or (1-x)NBST-xBMS was prepared with the aim of enhancing the breakdown strength (Eb) and reducing the energy storage loss through grain refinement. It was found that Eb of 0.9NBST-0.1BMS reaches 405 kV/cm due to the reduction in the grain size of ceramic and thus the extremely high ratio of grain boundary resistance to grain resistance. Besides, a remarkable energy-storage performance was obtained, that is, Wrec and η are ∼ 6.68 J/cm3 and 89.1% at 405 kV/cm, respectively, along with excellent stability in terms of frequency, temperature, and fatigue endurance. The outstanding energy-storage performance is resulted from modulating the grain size via doping the moderate content of Bi3+ and Mg2+/Sn4+, which is beneficial to increase the breakdown field by increasing resistivity under high electric field while increasing the grain boundary activation energy and promote the formation of a relaxor state at the same time. More importantly, energy storage potential (defined as Wrec/Eb) is up to 0.01649 μC/cm2, being the highest value reported so far for BNT-based ceramics in energy-storage application. Our results pave the way for practical applications of NBST-based ferroelectric capacitors with excellent energy storage performance.

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Topics: Grain boundary (56%), Ferroelectric ceramics (55%), Energy storage (54%) ... show more


59 results found

Journal ArticleDOI: 10.1016/J.RSER.2014.07.113
Abstract: Electric energy security is essential, yet the high cost and limited sources of fossil fuels, in addition to the need to reduce greenhouse gasses emission, have made renewable resources attractive in world energy-based economies. The potential for renewable energy resources is enormous because they can, in principle, exponentially exceed the world׳s energy demand; therefore, these types of resources will have a significant share in the future global energy portfolio, much of which is now concentrating on advancing their pool of renewable energy resources. Accordingly, this paper presents how renewable energy resources are currently being used, scientific developments to improve their use, their future prospects, and their deployment. Additionally, the paper represents the impact of power electronics and smart grid technologies that can enable the proportionate share of renewable energy resources.

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Topics: Feed-in tariff (68%), Energy development (65%), Renewable energy credit (65%) ... show more

1,394 Citations

Journal ArticleDOI: 10.1016/J.PMATSCI.2018.12.005
Letao Yang1, Xi Kong1, Fei Li2, Hua Hao3  +4 moreInstitutions (4)
Abstract: The projected increase in world energy consumption within the next 50 years, coupled with low emission requirements, has inspired an enormous effort towards the development of efficient, clean, and renewable energy sources. Efficient electrical energy storage solutions are keys to effective implementation of the electricity generated from these renewable sources. In step with the development of energy storage technology and the power electronics industry, dielectric materials with high energy density are in high demand. The dielectrics with a medium dielectric constant, high breakdown strength, and low polarization hysteresis are the most promising candidates for high-power energy storage applications. Inspiring energy densities have been achieved in current dielectrics, but challenges exist for practical applications, where the underlying mechanisms need to be understood for further enhancing their properties to meet future energy requirements. In this review, we summarize the principles of dielectric energy-storage applications, and recent developments on different types of dielectrics, namely linear dielectrics, paraelectrics, ferroelectrics, and antiferroelectrics, are surveyed, focusing on perovskite lead-free dielectrics. The new achievements of polymer-ceramic composites in energy-storage applications are also reviewed. The pros and cons of each type of dielectric, the existing challenges, and future perspectives are presented and discussed with respect to specific applications.

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432 Citations

Journal ArticleDOI: 10.1039/C6TA07803F
Tengqiang Shao, Hongliang Du, Hua Ma, Shaobo Qu  +4 moreInstitutions (1)
Abstract: The development of lead-free bulk ceramics with high recoverable energy density (Wrec) is of decisive importance for meeting the requirements of advanced pulsed power capacitors toward miniaturization and integration. However, the Wrec (<2 J cm−3) of lead-free bulk ceramics has long been limited by their low dielectric breakdown strength (DBS < 200 kV cm−1) and small saturation polarization (Ps). In this work, a strategy (compositions control the grain size of lead-free ceramics to submicron scale to increase the DBS, and the hybridization between the Bi 6p and O 2p orbitals enhances the Ps) was proposed to improve the Wrec of lead-free ceramics. (K0.5Na0.5)NbO3–Bi(Me2/3Nb1/3)O3 solid solutions (where Me2+ = Mg and Zn) were designed for achieving large Ps, and high DBS and Wrec. As an example, (1 − x)(K0.5Na0.5)NbO3–xBi(Mg2/3Nb1/3)O3 (KNN–BMN) ceramics were prepared by using a conventional solid-state reaction process in this study. Large Ps (41 μC cm−2) and high DBS (300 kV cm−1) were obtained for 0.90KNN–0.10BMN ceramics, leading to large Wrec (4.08 J cm−3). The significantly enhanced Wrec is more than 2–3 times larger than that of other lead-free bulk ceramics. The findings in this study not only provide a design methodology for developing lead-free bulk ceramics with large Wrec but also could bring about the development of a series of KNN-based ceramics with significantly enhanced Wrec and DBS in the future. More importantly, this work opens a new research and application field (dielectric energy storage) for (K0.5Na0.5)NbO3-based ceramics.

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299 Citations

Journal ArticleDOI: 10.1039/C8TC03003K
Abstract: The development of energy storage devices with a high energy storage density, high power density, and excellent stability has always been a long-cherished goal for many researchers as they tackle issues concerning energy conservation and environmental protection. In this work, we report a novel BaTiO3-based lead-free composition (0.85BaTiO3–0.15Bi(Zn1/2Sn1/2)O3) with an ultrahigh energy storage density (2.41 J cm−3) and a high energy storage efficiency of 91.6%, which is superior to other lead-free systems reported recently. The energy storage properties of 0.85BT–0.15BZS ceramic manifest excellent frequency stability (5–1000 Hz) and fatigue endurance (cycle number: 105). The pulsed charging–discharging process is measured to elucidate the actual operation performance in the 0.85BT–0.15BZS ceramic. Delightfully, the 0.85BT–0.15BZS ceramic also possesses an ultrahigh current density of 551 A cm−2 and a giant power density of 30.3 MW cm−3, and the stored energy is released in sub-microseconds. Moreover, the 0.85BT–0.15BZS ceramic exhibits outstanding temperature stability of its dielectric properties, energy storage properties, and charging–discharging performance over a broad temperature range (20–160 °C) due to the weakly-coupled relaxor behavior. These results not only indicate the superior potential of environment-friendly BaTiO3-based relaxor ferroelectric ceramics for the design of ceramic capacitors of both high energy storage and power applications, but they also show the merit of the weakly-coupled relaxor behavior to improve the thermal stability of energy storage properties.

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Topics: Energy storage (64%), Ceramic (55%), Ceramic capacitor (55%) ... show more

241 Citations

Open accessJournal ArticleDOI: 10.1039/C7TA03821F
Ye Tian1, Ye Tian2, Li Jin2, Hangfeng Zhang1  +6 moreInstitutions (3)
Abstract: Ag(Nb0.8Ta0.2)O3 is used here as a model system to shed light on the nature of the low temperature phase behavior of the unsubstituted parent compound AgNbO3, which is an important material for high-power energy storage applications. The three dielectric anomalies previously identified as M1 ↔ M2, Tf and M2 ↔ M3 transitions in AgNbO3 ceramics are found to be intimately related to the polarization the behavior of the B-site cations. In particular, the M1 ↔ M2 transition is found to involve the disappearance of original ferroelectric polar structure in the M1 phase. Analysis of weak-field and strong field hysteresis loops in the M2 region below Tf suggests the presence of a weakly-polar structure exhibiting antipolar behavior (i.e., a non-compensated antiferroelectric), which can be considered as ferrielectric (FIE). Modeling of the permittivity data using the Curie–Weiss law indicates that the Curie temperature is close to the freezing temperature, Tf, which can be regarded as the Curie point of the FIE phase. Substitution by Ta5+ in this system enhances the stability of the weakly polar/antiferroelectric state, giving rise to an increased energy storage density of 3.7 J cm−3 under an applied field of 27 MV m−1, one of the highest values ever reported for a dielectric ceramic. Furthermore, the energy storage capability remains approximately constant at around 3 J cm−3 up to 100 °C, at an applied field of 22 MV m−1.

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Topics: Curie temperature (59%), Dielectric (56%), Phase transition (55%) ... show more

209 Citations