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
26 मई 2024
Accepted
24 जून 2024
First published
28 जून 2024

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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