High energy density polymer nanocomposites reinforced with high dielectric constant ferroelectric nanoparticles exhibit great potential for energy storage applications in modern electronic and electrical systems. However, further improvements in the U_e of polymer nanocomposites with a higher breakdown strength (E_b) is of utmost importance. Tuning the permittivity from the filler center to the surrounding matrix in composites can alleviate local charge concentrations. Here, a gradient dielectric constant buffer layer is constructed via induced selectively titanium dioxide is inserted into the multilayer aluminosilicate. This gradient-structured buffer layer remarkably weakened the charge density around the ferroelectric particles, which gave rise to high breakdown strength and increased the energy density of the polymer nanocomposites. Furthermore, the density functional theory (DFT) calculation reveals an active charge transfer between buffer layer and poly(vinylidene fluoride-co-hexafluoropropylene). The space charge density distribution is simulated via finite element methods to verify the experimental dielectric breakdown results in the nanocomposite films. Therefore, this work provides a new strategy to balance the coupling relationship between energy density and breakdown strength.

中文翻译：

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一种新兴的矿物基介电材料：本征介电性能和调制

用高介电常数铁电纳米粒子增强的高能量密度聚合物纳米复合材料在现代电子和电气系统中的储能应用中展现出巨大潜力。然而，具有更高击穿强度的聚合物纳米复合材料的U _e的进一步改进（ E _b) 是最重要的。调整复合材料中从填料中心到周围基质的介电常数可以减轻局部电荷集中。在这里，梯度介电常数缓冲层是通过诱导选择性地将二氧化钛插入多层铝硅酸盐中而构建的。这种梯度结构的缓冲层显着削弱了铁电粒子周围的电荷密度，从而提高了击穿强度并增加了聚合物纳米复合材料的能量密度。此外，密度泛函理论 (DFT) 计算揭示了缓冲层和聚（偏二氟乙烯-共聚-六氟丙烯）之间的活性电荷转移。通过有限元方法模拟空间电荷密度分布，以验证纳米复合薄膜中的实验介电击穿结果。因此，这项工作提供了一种新的策略来平衡能量密度和击穿强度之间的耦合关系。