Ultrahigh energy storage in high-entropy ceramic capacitors with polymorphic relaxor phase

• 成果类型: Article
• 署名作者: Zhang, Min; Lan, Shun; Yang, Bing B.; Pan, Hao; Liu, Yi Q.; Zhang, Qing H.; Qi, Jun L.; Chen, Di; Su, Hang; Yi, Di; Yang, Yue Y.; Wei, Rui; Cai, Hong D.; Han, Hao J.; Gu, Lin; Nan, Ce-Wen; Lin, Yuan-Hua
• 署名单位: Tsinghua University; Chinese Academy of Sciences; Hefei Institutes of Physical Science, CAS; University of California System; University of California Berkeley; Chinese Academy of Sciences; Institute of Physics, CAS; Tsinghua University; Tsinghua University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11001
• DOI: 10.1126/science.adl2931
• 发表日期: 2024-04-12
• 页码: 185-189
• 关键词: density; multilayers; fatigue

摘要

Ultrahigh-power-density multilayer ceramic capacitors (MLCCs) are critical components in electrical and electronic systems. However, the realization of a high energy density combined with a high efficiency is a major challenge for practical applications. We propose a high-entropy design in barium titanate (BaTiO3)-based lead-free MLCCs with polymorphic relaxor phase. This strategy effectively minimizes hysteresis loss by lowering the domain-switching barriers and enhances the breakdown strength by the high atomic disorder with lattice distortion and grain refining. Benefiting from the synergistic effects, we achieved a high energy density of 20.8 joules per cubic centimeter with an ultrahigh efficiency of 97.5% in the MLCCs. This approach should be universally applicable to designing high-performance dielectrics for energy storage and other related functionalities.