Abstract Dielectric composites with excellent capacitive energy storage capabilities have great potential applications in energy storage capacitors operating efficiently at relatively low field strengths. Herein, unlike the traditional methods via the introduction of fillers including randomly distributed ceramic nanofibers and aligned nanowires arrays into the monolayer films are simply to increase the energy storage density (Ue), both Ue and charge–discharge efficiency (η) at low electric field strengths have been improved in tri-layered all-polymer films owing to the synergistic effect of multiple interbedded interfaces and deliberately modulation of linear dielectric poly(methyl methacrylate) (PMMA) contents. The effects of film structure on the energy storage capabilities have been comparatively discussed. Consequently, an ultrahigh Ue of 15 J cm−3 accompanied with great η of 76.5% has been delivered in the resulting tri-layered film via optimizing the PMMA content (30 wt%) of out layers at 350 MV m−1, surpassing the energy storage upper limits of the reported polymer dielectrics that show the Ue of ~12 J cm−3 and η of ~70% at comparable electric fields of 310–380 MV m−1. Along with high pulsed power density, multicomponent polymer dielectrics with hierarchically structure provide an effective paradigm for achieving the low operating field strength applications of capacitive energy storage devices with excellent energy storage capability.

中文翻译：

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在具有分级结构的多组分聚合物电介质中实现低工作场强下的超高能量存储密度

摘要 具有优异电容储能能力的介电复合材料在相对低场强下高效运行的储能电容器中具有巨大的潜在应用。在此，与传统方法不同，通过将填料（包括随机分布的陶瓷纳米纤维和排列的纳米线阵列）引入单层薄膜中，只是为了增加低电场下的储能密度（Ue）、Ue 和充放电效率（η）由于多个互层界面的协同效应和线性介电聚（甲基丙烯酸甲酯）（PMMA）含量的有意调制，三层全聚合物薄膜的强度得到了提高。比较讨论了薄膜结构对储能能力的影响。最后，通过在 350 MV m-1 下优化外层的 PMMA 含量（30 wt%），在所得三层薄膜中提供了 15 J cm-3 的超高 Ue 和 76.5% 的大 η，超过了能量存储所报道的聚合物电介质的上限显示在 310-380 MV m-1 的可比电场下，Ue 为 ~12 J cm-3，η 为 ~70%。除了高脉冲功率密度外，具有分级结构的多组分聚合物电介质为实现具有优异储能能力的电容储能装置的低工作场强应用提供了有效的范例。超过了报道的聚合物电介质的储能上限，在 310-380 MV m-1 的可比电场下，Ue 为~12 J cm-3，η 为~70%。除了高脉冲功率密度外，具有分级结构的多组分聚合物电介质为实现具有优异储能能力的电容储能装置的低工作场强应用提供了有效的范例。超过了报道的聚合物电介质的储能上限，在 310-380 MV m-1 的可比电场下，Ue 为~12 J cm-3，η 为~70%。除了高脉冲功率密度外，具有分级结构的多组分聚合物电介质为实现具有优异储能能力的电容储能装置的低工作场强应用提供了有效的范例。