材料科学
复合数
电介质
电容感应
电容器
储能
有机半导体
聚合物
半导体
光电子学
复合材料
电压
电气工程
功率(物理)
物理
工程类
量子力学
作者
Yao Zhou,Yujie Zhu,Wenhan Xu,Qing Wang
标识
DOI:10.1002/aenm.202203961
摘要
Abstract Dielectric capacitors are essential components of advanced high‐power electrical and electronic systems for electrical energy storage. The drastic reductions in the energy density and the charge‐discharge efficiency of dielectric polymers at elevated temperatures, owing to sharply increased electrical conduction, remain a major challenge. While substantial progress has been made in enhancing the high‐temperature capacitive performance of dielectric polymers, the improvement has been rather limited when the temperature exceeds 150 °C. Here, a universal approach to the control of the energy level of charge traps in all‐organic polymer composites by substituent engineering of organic semiconductors, leading to significantly suppressed high‐field high‐temperature conduction loss and improved capacitive performance is reported. At 200 °C, the polymer/organic semiconductor composite delivers ultrahigh energy densities of 3.4 and 5.0 J cm −3 with an efficiency >90% at 10 and 100 Hz, respectively, outperforming the current dielectric polymers and composites. The underlying mechanism of the improved performance is revealed experimentally and confirmed computationally. Moreover, excellent cyclability and the ability to be fabricated into large‐area high‐quality films with uniform performance, along with an ultralow filler loading, further demonstrate the potential of molecularly engineered organic semiconductors for dielectric polymer composites operating under extreme conditions.
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