Polymer‐based nanocomposite dielectrics with high energy storage capacity are crucial enablers for numerous applications in modern electronic and electrical industries. The energy density of parallel plate capacitors is determined by breakdown strength and dielectric permittivity of the inner dielectrics. Poly(vinylidene fluoride‐trifluoroethylene‐chlorofluoroethylene) (P(VDF‐TrFE‐CFE)), with the highest permittivity among all the dielectric polymers, is a promising candidate for high energy density capacitors. However, its relatively low breakdown strength and energy efficiency restrict the applications. In this work, a new method combining combinatorial‐electrospinning and hot‐pressing is proposed to fabricate P(VDF‐TrFE‐CFE)‐based all‐organic dielectrics with ferroconcrete‐like structure. In this structure, continuous fibers of polysulfone (PSF) with high Young's modulus act as tough scaffold to improve the mechanical properties of nanocomposites, and an over 750% enhancement of Young's modulus is obtained. The enhanced mechanical properties bring about significant improvement in Weibull breakdown strength to 485 MV m⁻¹, more than 50% higher than neat terpolymer. Furthermore, the suppressed leakage current and conduction loss, and hence the improved discharge energy efficiency under moderate electric field, are achieved due to the high insulation of PSF and its interfacial restriction on space charge mobility.

中文翻译：

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像钢筋混凝土一样的全有机纳米复合材料，具有改善的机械性能，高的击穿强度和高的能效

具有高能量存储能力的基于聚合物的纳米复合电介质是现代电子和电气行业中众多应用的关键推动力。平行板电容器的能量密度取决于内部电介质的击穿强度和介电常数。在所有介电聚合物中电容率最高的聚偏二氟乙烯-三氟乙烯-氯氟乙烯（P（VDF-TrFE-CFE））是高能量密度电容器的有希望的候选者。但是，其较低的击穿强度和能效限制了其应用。在这项工作中，提出了一种结合组合电纺丝和热压的新方法来制造具有铁混凝土结构的P（VDF-TrFE-CFE）基全有机电介质。在这种结构中 高杨氏模量的聚砜（PSF）连续纤维充当韧性支架，可改善纳米复合材料的机械性能，并获得超过750％的杨氏模量提高。增强的机械性能极大地提高了485 MV m的威布尔击穿强度^-1，比纯三元共聚物高出50％以上。此外，由于PSF的高绝缘性及其对空间电荷迁移率的界面限制，因此可以在中等电场下抑制泄漏电流和传导损耗，从而提高放电能量效率。