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Excellent energy storage performances for BaTiO3-based multilayer capacitors through synergistic high-entropy and superparaelectric-relaxor strategy
Journal of Materiomics 2025, 11(1): 100860
Published: 16 April 2024
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Dielectric capacitors with high energy storage performances are exceedingly desired for the next-generation advanced high/pulsed power devices that demand miniaturization and integration. However, poor energy-storage density (Urec) and low efficiency (η) resulted from the large remanent polarization (Pr) and low breakdown strength (BDS), have been the major challenge for the application of dielectric capacitors. Herein, a high-entropy strategy with superparaelectric relaxor ferroelectrics (SP-RFE) was adopted to achieve extremely low Pr and high BDS in BaTiO3 system, simultaneously. Due to the high BDS ~800 kV/cm and low Pr ~0.58 μC/cm2, high-entropy SP-RFE (La0.05Ba0.18Sr0.18K0.115Na0.115Ca0.18Bi0.18)TiO3 (LBSKNCBT) MLCCs exhibited high Urec ~6.63 J/cm3 and excellent η ~ 96%. What's more, LBSKNCBT MLCCs with high-entropy and SP-RFE characteristic also possess a good temperature and frequency stability. In a word, this work offers an excellent paradigm for achieving good energy-storage properties of BaTiO3-based dielectric capacitors to meet the demanding requirements of advanced energy storage applications.

Open Access Research Article Issue
Ultrahigh energy storage performance realized in AgNbO3-based antiferroelectric materials via multiscale engineering
Journal of Advanced Ceramics 2023, 12(6): 1166-1177
Published: 17 May 2023
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Antiferroelectric (AFE) materials are promising for the applications in advanced high-power electric and electronic devices. Among them, AgNbO3 (AN)-based ceramics have gained considerable attention due to their excellent energy storage performance. Herein, multiscale synergistic modulation is proposed to improve the energy storage performance of AN-based materials, whereby the multilayer structure is employed to improve the breakdown strength (Eb), and Sm/Ta doping is utilized to enhance the AFE stability. As a result, ultrahigh recoverable energy storage density (Wrec) up to 15.0 J·cm−3 and energy efficiency of 82.8% are obtained at 1500 kV·cm−1 in Sm/Ta co-doped AN multilayer ceramic capacitor (MLCC), which are superior to those of the state-of-the-art AN-based ceramic capacitor. Moreover, the discharge energy density (Wd) in direct-current charge–discharge performance reaches 9.1 J·cm−3, which is superior to that of the reported lead-free energy storage systems. The synergistic design of composition and multilayer structure provides an applicable method to optimize the energy storage performance in all dielectric energy storage systems.

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