弛豫器中的极性分区策略可带来巨大的能量存储能力。

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2024-07-11 DOI:10.1126/science.adn8721

Liang Shu, Xiaoming Shi, Xin Zhang, Ziqi Yang, Wei Li, Yunpeng Ma, Yi-Xuan Liu, Lisha Liu, Yue-Yu-Shan Cheng, Liyu Wei, Qian Li, Houbing Huang, Shujun Zhang, Jing-Feng Li

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引用次数: 0

摘要

松弛铁电（RFE）薄膜因其高能量密度（Ue）和高效率而成为有望实现大功率电子系统微型化的储能候选器件。然而，要将其能量密度提高到每立方厘米 200 焦耳以上却极具挑战性，这限制了其在下一代储能设备中的应用潜力。我们在 RFE 中实施了极性分区策略，以推进 Ue 的边界。在相场模拟的指导下，我们设计并制造出了高性能的 Bi（Mg0.5Ti0.5）O3-SrTiO3 基 RFE 薄膜，通过抑制非极性立方基体和引入高绝缘网络，实现了孤立的泥泞状极性团簇。通过同时增强可逆极化和击穿强度，Ue 可达到每立方厘米 202 焦耳，效率高达 ~79%。所提出的策略为下一代高性能电介质提供了设计自由度。

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Partitioning polar-slush strategy in relaxors leads to large energy-storage capability

Relaxor ferroelectric (RFE) films are promising energy-storage candidates for miniaturizing high-power electronic systems, which is credited to their high energy density (U_e) and efficiency. However, advancing their U_e beyond 200 joules per cubic centimeter is challenging, limiting their potential for next-generation energy-storage devices. We implemented a partitioning polar-slush strategy in RFEs to push the boundary of U_e. Guided by phase-field simulations, we designed and fabricated high-performance Bi(Mg_0.5Ti_0.5)O₃-SrTiO₃–based RFE films with isolated slush-like polar clusters, which were realized through suppression of the nonpolar cubic matrix and introduction of highly insulating networks. The simultaneous enhancement of the reversible polarization and breakdown strength leads to a U_e of 202 joules per cubic centimeter with a high efficiency of ~79%. The proposed strategy provides a design freedom for next-generation high-performance dielectrics.

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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