共聚物
材料科学
电介质
电容器
泄漏(经济)
单体
聚合物电容器
电流密度
聚合物
复合材料
电压
分析化学(期刊)
光电子学
电气工程
电解电容器
工程类
化学
有机化学
物理
宏观经济学
经济
量子力学
作者
Xinyi Li,Yunchuan Xie,Jie Xiong,Dajiang Long,Jin Zhang,Bofeng Zhu,Xiao Zhang,Xin‐Hua Duan,Zhenxue Liu,Zhicheng Zhang,Xingyi Huang
标识
DOI:10.1016/j.cej.2023.143324
摘要
High-temperature film capacitors have great potential for high-power-density applications, in which polymer films are often utilized as energy-storage dielectrics. However, their application in film-capacitor dielectrics is hindered by their large leakage currents at high temperatures, which leads to low energy density (Ue) and low charge–discharge efficiency (η). Here, a structural-tailoring strategy is demonstrated to suppress the high-temperature leakage currents of polyaryletherketone (PAEK) copolymers. For this purpose, a novel functional monomer containing benzimidazole and pyridine groups (BBP) was synthesized and the corresponding cross-linked c-P(AEK-BBP) dielectric films were successfully to prepared. Thanks to the introduction of the BBP units and the cross-linked network, the leakage current of c-P(AEK–BBP) is suppressed by nearly two orders of magnitude at 150 °C. This dielectric film exhibits 7.3 J·cm−3 under 600 MV·m−1 and 150 °C, which is superior to current state-of-the-art heat-resistant dielectric polymers.
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