Excellent energy storage performances for BaTiO3-based multilayer capacitors through synergistic high-entropy and superparaelectric-relaxor strategy

IF 8.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL Journal of Materiomics Pub Date : 2024-04-16 DOI:10.1016/j.jmat.2024.03.005

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Abstract

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 (U_rec) and low efficiency (η) resulted from the large remanent polarization (P_r) 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 P_r and high BDS in BaTiO₃ system, simultaneously. Due to the high BDS ∼800 kV/cm and low P_r ∼0.58 μC/cm², high-entropy SP-RFE (La_0.05Ba_0.18Sr_0.18K_0.115Na_0.115Ca_0.18Bi_0.18)TiO₃ (LBSKNCBT) MLCCs exhibited high U_rec ∼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.

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通过协同高熵和超准电松弛策略实现基于 BaTiO3 的多层电容器的卓越储能性能

对于要求微型化和集成化的下一代先进高/脉冲功率器件来说，具有高储能性能的介质电容器是极其需要的。然而，大剩磁极化（Pr）和低击穿强度（BDS）导致的低储能密度（Urec）和低效率（η）一直是电介质电容器应用面临的主要挑战。在此，我们采用了超准电松弛铁电体（SP-RFE）的高熵策略，在 BaTiO3 体系中同时实现了极低的 Pr 和高的 BDS。由于具有高 BDS ∼800 kV/cm 和低 Pr ∼0.58 μC/cm2，高熵 SP-RFE (La0.05Ba0.18Sr0.18K0.115Na0.115Ca0.18Bi0.18)TiO3 (LBSKNCBT) MLCC 显示出高 Urec ∼6.63 J/cm3 和优异的 η ∼ 96%。此外，具有高熵和 SP-RFE 特性的 LBSKNCBT MLCC 还具有良好的温度和频率稳定性。总之，这项工作为实现基于 BaTiO3 的电介质电容器的良好储能特性提供了一个很好的范例，以满足先进储能应用的苛刻要求。

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来源期刊

Journal of Materiomics Materials Science-Metals and Alloys

CiteScore

14.30

自引率

6.40%

发文量

331

审稿时长

37 days

期刊介绍： The Journal of Materiomics is a peer-reviewed open-access journal that aims to serve as a forum for the continuous dissemination of research within the field of materials science. It particularly emphasizes systematic studies on the relationships between composition, processing, structure, property, and performance of advanced materials. The journal is supported by the Chinese Ceramic Society and is indexed in SCIE and Scopus. It is commonly referred to as J Materiomics.