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 май 2024
Accepted
24 июн 2024
First published
28 июн 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements