脂环化合物
材料科学
电介质
电容器
偶极子
电容感应
聚合物
解耦(概率)
光电子学
纳米技术
复合材料
高分子化学
电气工程
电压
有机化学
化学
工程类
控制工程
作者
Weibin Ren,Hui Tong,Shimo Cao,Shuo Zhao,Minzheng Yang,Xin Li,Jiayu Pan,Nannan Sun,Yao Xiao,Erxiang Xu,Ce‐Wen Nan,Yang Shen
标识
DOI:10.1002/adma.202505296
摘要
Abstract Ultrahigh‐power‐density metallized film capacitors at elevated temperatures and electric field extremes are key components in electrical and electronic systems. The miniaturization, integration, and cost‐effectiveness of the systems demand high‐energy‐density, high‐efficiency, and reliable dielectrics. A major challenge is to concurrently break multiple paradoxes of bandgap ( E g ) with glass transition temperature ( T g ), dielectric constant ( ɛ r ) with E g, and self‐healing capability with T g . In this contribution, a class of semi‐alicyclic dipolar glass dielectric polymers (sAl‐DG) is developed, with an alternating non‐conjugated alicyclic unit and a strong dipolar group aromatic unit. The alicyclic unit synergistically confers a large E g and the potential for strong self‐healing while the other unit concurrently endows high polarization and thermal stability, effectively decoupling the multiple paradoxes. As a result, sAl‐DG delivers large E g with 3.99–4.26 eV, high T g with 218–387 °C, high ɛ r with 3.39–3.71 (200°C, 1 kHz) and simultaneously excellent self‐healing ability with self‐healing energy of 15.03 mJ. Hence, this molecular decoupling strategy enables a superior discharge energy density with 90% discharge efficiency ( U η90 ) of up to 6.2 J cm −3 at 200 °C, and state‐of‐the‐art 3.94 J cm −3 at 250 °C. Plus, a stacked sAl‐DG capacitor demonstrates 1.06 J cm − 3 at 94% efficiency under 250 MV m −1 and 200°C, showcasing operational viability.
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