journal article·2026-05-19Open access

Local Polarization Unit Engineering Enables Ultrahigh Energy Density in NBT‐Based High‐Entropy Ceramic Capacitors

Shiyu Zhou, Yucheng Zhou, Linhai Li, A. Pelaiz‐Barranco, Xuefeng Chen, Genshui Wang, Yiwei Chen, Rongjiang Wang, Konstantin Nefedev, Tengfei Hu, Dawei Wang, Tongqing Yang

Abstract

ABSTRACT Dielectric energy storage capacitors play a pivotal role in pulsed power systems. Herein, we demonstrate a breakthrough in dielectric energy storage by engineering ​local polarization units in high‐entropy multilayer ceramic capacitors (MLCCs). By incorporating equimolar Ba 2 + /Sr 2 + dual cations, we precisely smoothen the phase transition and stabilize a nanoscale phase‐coexistence state in an NBT‐based matrix, which simultaneously retain robust local polar units while disrupting long‐range domain order. This unique configuration, validated by atomic‐resolution HAADF‐STEM and phase‐field simulations, enables a high reversible polarization and breakdown strength. The optimized MLCCs achieve an ultrahigh recoverable energy density of 18.2 J cm −3 with 91% efficiency, coupled with exceptional thermal stability and fatigue resistance. This work establishes a general design paradigm for high‐entropy dielectrics for energy storage by controlling local polarization configurations.
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Research context

OpenAlex topics: Ferroelectric and Piezoelectric Materials · Dielectric materials and actuators · Semiconductor materials and devices

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education Functional Materials Research Laboratory School of Materials Science and Engineering Tongji University Shanghai China

Mechanics of Functional Materials Division Institute of Materials Science Technische Universität Darmstadt Darmstadt Germany

The Key Lab of Inorganic Functional Materials and Devices Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai China

Grupo de Materiales Ferroicos Facultad de Física Universidad de La Habana San Lázaro y L, Vedado La Habana Cuba

Chengdu Weici Electronic Technology Co., Ltd Chengdu China

Far Eastern Federal University Vladivostok Russian

Precision Acousto‐optic Instrument Institute School of Instrumentation Science and Engineering Harbin Institute of Technology Harbin China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Deutsche Forschungsgemeinschaft

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