Issue 29, 2024

Ultrahigh energy storage capacities in high-entropy relaxor ferroelectrics

Abstract

Realizing ultrahigh recoverable energy-storage density (Wrec) alongside giant efficiency (η) remains a significant challenge for the advancement of dielectrics in next-generation pulse power energy-storage (ES) devices. In this study, we introduce an entropy engineering approach, manipulating local polar fluctuations and tailoring microstructure evolution through a high-entropy design strategy, to effectively regulate the ES performance of lead-free (Bi0.5Na0.5)TiO3 (BNT)-based dielectrics. By intricately designing a high-entropy matrix, (Bi0.375Na0.3Sr0.25K0.075)TiO3 (BNSKT), and enhancing configurational entropy with the Bi(Mg0.5Sn0.5)O3 (BMS) end member, we developed multi-cation substituted BNT relaxor ceramics based on a viscous polymer process (VPP) method. Our findings reveal that modulating atomic configurational entropy yields favorable and stable microstructural characteristics, contributing to an improved breakdown electric field (E-field), reduced hysteresis and delayed polarization saturation. The VPP-synthesized high-entropy 0.85BNSKT-0.15BMS (BNT-H15VPP) ceramics achieved a significant ES density Wrec of 11.24 J cm−3, η of 88.3%, and responsivity (ξ, defined as Wrec/E) of 184 J kV−1 cm−2 under 610 kV cm−1. Additionally, pulse charging/discharging measurements indicated a large discharge energy density (Wdis) of 6.6 J cm−3, a short discharge time of 2.2 μs, and remarkable temperature stability over 20–120 °C. This work underscores the feasibility of the high-entropy strategy for designing robust dielectric ceramics, heralding promising advancements in advanced ES capacitors with comprehensive ES performance.

Graphical abstract: Ultrahigh energy storage capacities in high-entropy relaxor ferroelectrics

Supplementary files

Article information

Article type
Paper
Submitted
18 ذو القعدة 1445
Accepted
18 ذو الحجة 1445
First published
22 ذو الحجة 1445

J. Mater. Chem. A, 2024,12, 18224-18233

Ultrahigh energy storage capacities in high-entropy relaxor ferroelectrics

Y. Huang, K. Shang, Y. Yang, W. Shi, L. Zhang, V. Laletin, V. Shur, R. Jing and L. Jin, J. Mater. Chem. A, 2024, 12, 18224 DOI: 10.1039/D4TA03637A

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