Mechanism of enhanced energy storage density in AgNbO3-based lead-free antiferroelectrics

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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“…The W rec and η of (b) AN and (c) Nd 0.01 Ta 0.20 codoped AN under the respective electric fields. 366 …”

Section: Strategies For Improving Energy Storage Propertiesmentioning

confidence: 99%

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

et al. 2021

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“…W rec ~6.5 J cm −3 has been achieved with conversion efficiencies around 70%. 250 For AgNbO 3 , the opening of the P-E hysteresis loop is not concomitant with a change in crystal class as observed in PbZrO 3 . Rather, the field-induced phase retains the same crystal class and quadrupling as the AFE phase but exhibits inequivalent antiparallel displacements of the cations and thus conforms to a field-induced ferrielectric phase.…”

Section: Afe Multilayer Ceramic Capacitorsmentioning

confidence: 80%

“…Optimized compositions are typically RE doped on the A site, which gives rise to V′ Ag and are Ta doped on the B site. W rec ~6.5 J cm −3 has been achieved with conversion efficiencies around 70% 250 . For AgNbO 3 , the opening of the P‐E hysteresis loop is not concomitant with a change in crystal class as observed in PbZrO 3 .…”

Section: Antiferroelectric Applicationsmentioning

confidence: 83%

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Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

et al. 2021

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Antiferroelectric (AFE) materials are of great interest owing to their scientific richness and their utility in high-energy density capacitors. Here, the history of AFEs is reviewed, and the characteristics of antiferroelectricity and the phase transition of an AFE material are described. AFEs are energetically close to ferroelectric (FE) phases, and thus both the electric field strength and applied stress (pressure) influence the nature of the transition. With the comparable energetics between the AFE and FE phases, there can be a competition and frustration of these phases, and either incommensurate and/or a glassy (relaxor) structures may be observed. The phase transition in AFEs can also be influenced by the crystal/grain size, particularly at nanometric dimensions, and may be tuned through the formation of solid solutions. There have been extensive studies on the perovskite family of AFE materials, but many other crystal structures host AFE behavior, such as CuBiP 2 Se 6 . AFE applications include DC-link capacitors for power electronics, defibrillator capacitors, pulse power devices, and electromechanical actuators. The paper concludes with a perspective on the future needs and opportunities with respect to discovery, science, and applications of AFE. K E Y W O R D S applications, dielectric materials/properties, ferroelectricity/ferroelectric materials, phase transition F I G U R E 3 Antiferroelectric double hysteresis loops in (A) Pb(Lu 0.5 Nb 0.5 )O 3 and (B) the temperature-dependent critical field in it (replotted from Ref. [30]). (C) shows the phase diagram of PbZrO 3 as a function of temperature and electrical field (replotted from Ref.

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“…Chemical doping is a simple and effective method to enhance W rec of AN-based ceramic bulks. For example, Ta 5+ [218,222] and W 3+ [223] substitute Nb 5+ of B site, and Bi 3+ [224], Ca 2+ [225], and La 3+ [226] replace Ag + of A site. In 2017, Zhao et al [218] fabricated Ag(Nb 1−x Ta x )O 3 antiferroelectric ceramics, and P r decreases from 3.6 to 1.2 μC/cm 2 whereas E b enhances from 175 to 242 kV/cm with increasing Ta content.…”

Section: Lead-free Antiferroelectric Ceramicsmentioning

confidence: 99%

Progress and perspectives in dielectric energy storage ceramics

Zeng

et al. 2021

J Adv Ceram

192

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Dielectric ceramic capacitors, with the advantages of high power density, fast charge-discharge capability, excellent fatigue endurance, and good high temperature stability, have been acknowledged to be promising candidates for solid-state pulse power systems. This review investigates the energy storage performances of linear dielectric, relaxor ferroelectric, and antiferroelectric from the viewpoint of chemical modification, macro/microstructural design, and electrical property optimization. Research progress of ceramic bulks and films for Pb-based and/or Pb-free systems is summarized. Finally, we propose the perspectives on the development of energy storage ceramics for pulse power capacitors in the future.

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Mechanism of enhanced energy storage density in AgNbO3-based lead-free antiferroelectrics

Cited by 201 publications

References 58 publications

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Electroceramics for High-Energy Density Capacitors: Current Status and Future Perspectives

Antiferroelectrics: History, fundamentals, crystal chemistry, crystal structures, size effects, and applications

Progress and perspectives in dielectric energy storage ceramics

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