近日，中国科学院上海硅酸盐研究所王根水团队揭示了利用多点高熵结构实现超高能量存储多层电容器。该项研究成果发表在2025年10月29日出版的《美国化学会志》上。

高能量密度无铅介质电容器在先进的电气和电子系统中起着举足轻重的作用。然而，低能量存储能力一直对电子设备的小型化和集成化趋势构成重大障碍。

研究组报道了一种等摩尔高熵弛豫铁电多层电容器，通过利用柔性多位点四方钨青铜（TTB）高熵结构，展示了卓越的储能性能。研究结果表明，等摩尔高熵设计导致NbO₆八面体畸变，破坏了远程铁电秩序，同时在局部尺度上保持了沿极轴的强偏心位移。这种独特的高熵TTB结构特性不仅增强了其弛豫特性，减小了磁滞，而且在外加电场下保持了较高的极化率。因此，他们的高熵TTB多层陶瓷电容器实现了前所未有的20.2 J·cm^-3的可回收能量密度，并显著提高了93.8%的效率。这种方法通过设计灵活的多位点高熵结构，为开发具有突出储能能力的创新功能陶瓷和器件打开了大门。

附：英文原文

Title: Harnessing Multisite High-Entropy Architecture for Ultrahigh Energy Storage Multilayer Capacitors

Author: Zhen Liu, Haonan Peng, Teng Lu, Tiantian Wu, Cheng Yang, Zhengqian Fu, Zhichao Hong, Jiyang Xie, Takashi Honda, Yonghong Chen, Wanbiao Hu, Fangfang Xu, Zhisheng Lin, Yun Liu, Shujun Zhang, Genshui Wang, Junhao Chu

Issue&Volume: October 29, 2025

Abstract: High energy density lead-free dielectric capacitors play a pivotal role in state-of-the-art electrical and electronic systems. Nevertheless, the low energy storage capacities have persistently posed a significant impediment to the ongoing trend toward the miniaturization and integration of electronic devices. Here, we report an equimolar high-entropy relaxor ferroelectric multilayer capacitor that demonstrates exceptional energy storage performance by harnessing flexible multisite tetragonal tungsten bronze (TTB) high-entropy architecture. Our findings reveal that the equimolar high-entropy design results in NbO6 octahedra distortion, disrupting long-range ferroelectric order while preserving strong off-center displacements along the polar axis at a local scale. This unique structure characteristic of high-entropy TTB not only enhances its relaxor feature, reducing hysteresis, but also maintains high polarizability under applied electric fields. Consequently, our high-entropy TTB multilayer ceramic capacitors achieved an unprecedented recoverable energy density of 20.2 J·cm–3, accompanied by a notably enhanced efficiency of 93.8%. This approach opens the door for the development of innovative functional ceramics and devices with prominent energy storage capability by designing flexible multisite high-entropy architecture.

DOI: 10.1021/jacs.5c12566

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c12566