Achieving excellent energy storage performance of K1/2Bi1/2TiO3-based ceramics via multi-phase boundary and bandgap engineering

Zhang, Manlin; Zhu, Mankang; Chang, Ziliang; Li, Yexin; Zheng, Mupeng; Hou, Yudong; Zhou, Qiyuan; Chao, Xiaolian; Yang, Zupei

doi:10.1016/j.cej.2023.145314

Cited by 8 publications

(3 citation statements)

References 43 publications

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“…Encouragingly, a giant W rec of 17.3 J cm –3 , together with a high η of 88.5%, is realized under an E B of 78 kV mm –1 (Figure e). In comparison, the W rec in BKT-D1 exceeds the previously reported highest value in BKT-based systems, − ,− which was 7.6 J cm –3 in BKT-BT-NN, by more than double (Figure f and Table S3). Moreover, the energy storage properties well outperform other lead-free bulk ceramics, such as BT-based, BNT-based, NN-based, and AN-based RFEs (Figure S6).…”

Section: Resultscontrasting

confidence: 48%

“…The energy storage capacity of a dielectric material is determined by its polarization traits and breakdown strength ( E B ). Lead-free relaxor-ferroelectric (RFE) solid solutions exhibit desirable merits of large polarization ( P m ) and small hysteresis ( H ), making them the preferred option for high-performance dielectric capacitors. − Owing to the high chemical flexibility of perovskites that allow for various atomic combinations at both A- and B-sites, substantial lead-free RFEs have been explored to optimize energy-storage performance. − ,− Examples include BaTiO 3 (BT)-based, ,, Bi 0.5 K 0.5 TiO 3 (BKT)-based, − SrTiO 3 (ST)-based, , Bi 0.5 Na 0.5 TiO 3 (BNT)-based, ,,− (K,Na)NbO 3 (KNN)-based, , NaNbO 3 (NN)-based, , and AgNbO 3 (AN)-based ,, relaxors, and their corresponding W rec in bulk ceramics has been significantly improved, with values typically ranging from 4 to 8 J cm –3 .…”

Section: Introductionmentioning

confidence: 99%

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Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Liu,

Sun,

Zhang

et al. 2024

J. Am. Chem. Soc.

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ABO 3 -type perovskite relaxor ferroelectrics (RFEs) have emerged as the preferred option for dielectric capacitive energy storage. However, the compositional design of RFEs with high energy density and efficiency poses significant challenges owing to the vast compositional space and the absence of general rules. Here, we present an atomic-level chemical framework that captures inherent characteristics in terms of radius and ferroelectric activity of ions. By categorizing A/B-site ions as host framework, rattling, ferroelectrically active, and blocking ions and assembling these four types of ions with specific criteria, linear-like relaxors with weak locally correlated and highly extendable unit-cell polarization vectors can be constructed. As example, we demonstrate two new compositions of Bi 0.5 K 0.5 TiO 3 -based and BaTiO 3 -based relaxors, showing extremely high recoverable energy densities of 17.3 and 12.1 J cm −3 , respectively, both with a high efficiency of about 90%. Further, the role of different types of ions in forming heterogeneous polar structures is identified through element-specific local structure analysis using neutron total scattering combined with reverse Monte Carlo modeling. Our work not only opens up new avenues toward rational compositional design of high energy storage performance lead-free RFEs but also sheds light on atomic-level manipulation of functional properties in compositionally complex ferroelectrics.

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Section: Resultscontrasting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Liu,

Sun,

Zhang

et al. 2024

J. Am. Chem. Soc.

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“…Dielectric capacitors store electrical energy as an electrostatic field, offering the highest power density of up to 10 8 MW kg –1 versus 10 2 W kg –1 for batteries and 10 5 W kg –1 for electrochemical capacitors due to their fastest charge–discharge rates at the microsecond scale. − Electrostatic energy-storage ceramic capacitors represent the core components in modern pulsed power systems and are utilized in a wide variety of applications, including electric vehicles, electronic gadgets, and power grids. , As technology continues to advance, there is an increasing need to develop next-generation dielectric ceramic capacitors to meet the demands of cutting-edge applications. These capacitors are anticipated to have a high energy-storage density ( W rec ) to support miniaturization and integration, as well as high energy-storage efficiency (η) to minimize energy loss and ensure reliability. − Hence, a vast range of Pb-free perovskite-structured dielectric ceramics, including BaTiO 3 (BT)-, , (Bi 0.5 Na 0.5 )TiO 3 (BNT)-, − (Bi 0.5 K 0.5 )TiO 3 (BKT)-, − NaNbO 3 (NN)-, − and AgNbO 3 (AN)- − based systems have been explored for electrostatic energy storage, with W rec values advancing to reach typically around 10 J cm –3 at η above 80%. − Despite these substantial advances, there is an ongoing challenge to boost W rec while maintaining a high η, given the trade-off relationship between these two merits.…”

Section: Introductionmentioning

confidence: 99%

Strong Local Polarization Fluctuations Enabled High Electrostatic Energy Storage in Pb-Free Relaxors

Sun,

Liu,

Zhang

et al. 2024

J. Am. Chem. Soc.

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Electrostatic energy-storage ceramic capacitors are essential components of modern electrified power systems. However, improving their energy-storage density while maintaining high efficiency to facilitate cutting-edge miniaturized and integrated applications remains an ongoing challenge. Herein, we report a record-high energy-storage density of 20.3 J cm −3 together with a high efficiency of 89.3% achieved by constructing a relaxor ferroelectric state with strongly enhanced local polarization fluctuations. This is realized by incorporating highly polarizable, heterovalent, and large-sized Zn and Nb ions into a Bi 0.5 Na 0.5 TiO 3 −BaTiO 3 ferroelectric matrix with very strong tetragonal distortion. Element-specific local structure analysis revealed that the foreign ions strengthen the magnitude of the unit-cell polarization vectors while simultaneously reducing their orientation anisotropy and forming strong fluctuations in both magnitude and orientation within 1−3 nm polar clusters. This leads to a particularly high polarization variation (ΔP) of 72 μC cm −2 , low hysteresis, and a high effective polarization coefficient at a high breakdown strength of 80 kV mm −1 . This work has surpassed the current energy density limit of 20 J cm −3 in bulk Pb-free ceramics and has demonstrated that controlling the local structure via the chemical composition design can open up new possibilities for exploring relaxors with high energy-storage performance.

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Realizing Outstanding Energy Storage Performance in KBT‐Based Lead‐Free Ceramics via Suppressing Space Charge Accumulation

Li,

Chang,

Zhang

et al. 2024

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The great potential of K1/2Bi1/2TiO3 (KBT) for dielectric energy storage ceramics is impeded by its low dielectric breakdown strength, thereby limiting its utilization of high polarization. This study develops a novel composition, 0.83KBT‐0.095Na1/2Bi1/2ZrO3‐0.075 Bi0.85Nd0.15FeO3 (KNBNTF) ceramics, demonstrating outstanding energy storage performance under high electric fields up to 425 kV cm−1: a remarkable recoverable energy density of 7.03 J cm−3, and a high efficiency of 86.0%. The analysis reveals that the superior dielectric breakdown resistance arises from effective mitigation of space charge accumulation at the interface, influenced by differential dielectric and conductance behaviors between grains and grain boundaries. Electric impedance spectra confirm the significant suppression of space charge accumulation in KNBNTF, attributable to the co‐introduction of Na1/2Bi1/2ZrO3 and Bi0.85Nd0.15FeO3. Phase‐field simulations reveal the emergence of a trans‐granular breakdown mode in KNBNTF resulting from the mitigated interfacial polarization, impeding breakdown propagation and increasing dielectric breakdown resistance. Furthermore, KNBNTF exhibits a complex local polarization and enhances the relaxor features, facilitating high field‐induced polarization and establishing favorable conditions for exceptional energy storage performance. Therefore, the proposed strategy is a promising design pathway for tailoring dielectric ceramics in energy storage applications.

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Achieving excellent energy storage performance of K1/2Bi1/2TiO3-based ceramics via multi-phase boundary and bandgap engineering

Cited by 8 publications

References 43 publications

Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Chemical Framework to Design Linear-like Relaxors toward Capacitive Energy Storage

Strong Local Polarization Fluctuations Enabled High Electrostatic Energy Storage in Pb-Free Relaxors

Realizing Outstanding Energy Storage Performance in KBT‐Based Lead‐Free Ceramics via Suppressing Space Charge Accumulation

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