Dielectric Properties’ Synergy of Stretched P(VDF-HFP) and P(VDF-HFP)/PMMA Blends Creates Ultrahigh Capacitive Energy Density in All-Organic Dielectric Films,ACS Applied Energy Materials

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Dielectric Properties’ Synergy of Stretched P(VDF-HFP) and P(VDF-HFP)/PMMA Blends Creates Ultrahigh Capacitive Energy Density in All-Organic Dielectric Films
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-06-16 , DOI: 10.1021/acsaem.2c00755
Qinzhao Sun ₁ , Bofeng Shi ₁ , Tianran Zhang ₁ , Weijie Yang ₁ , Jiping Wang ₁ , Lixue Zhang ₁ , Dezhen Xue ₁ , Zepeng Wang ₁ , Fang Kang ₁ , Xiaoxiao Zhang ₂

Affiliation

Dielectric capacitors with a high energy-storage density and efficiency are urgently required for miniaturization and integration of power electronics and pulsed power system. Herein, single-layered stretched P(VDF-HFP) with a certain content of poly(methyl methacrylate) (PMMA) and two kinds of sandwich-structured films are prepared to optimize and compare energy-storage performance. The results revealed that the crystallization transition behavior of stretched P(VDF-HFP) films contributed to enhance its electric polarization, while the introduction of linear type PMMA resulted in an enhancement of voltage tolerance of stretched films by improving the mechanical properties and suppressing leakage current. What’s more, the effects of crystalline orientations and structure design on the breakdown mechanism of stretched films were revealed by finite element theoretical simulation. As a consequence, the stretched sandwich-structured 0-25-0-S (pure P(VDF-HFP) serves as the outer layer, and blends represent the middle layer; the digit representing PMMA content in the P(VDF-HFP)) displayed a high U_e of 28.71 J/cm³ and η of 74% under 680 MV/m. This work provides a workable and effective method for developing capacitive films with great energy-storage performance.

中文翻译：

拉伸 P(VDF-HFP) 和 P(VDF-HFP)/PMMA 共混物的介电性能协同作用在全有机介电薄膜中创造了超高的电容能量密度

电力电子和脉冲电力系统的小型化和集成化迫切需要具有高储能密度和效率的介质电容器。在此，制备了具有一定含量聚甲基丙烯酸甲酯（PMMA）的单层拉伸P（VDF-HFP）和两种夹心结构薄膜，以优化和比较储能性能。结果表明，拉伸P（VDF-HFP）薄膜的结晶转变行为有助于增强其电极化，而线性型PMMA的引入通过改善拉伸薄膜的机械性能和抑制漏电流来提高拉伸薄膜的耐压性. 更重要的是，通过有限元理论模拟揭示了晶体取向和结构设计对拉伸薄膜击穿机制的影响。因此，拉伸的三明治结构的0-25-0-S（纯P（VDF-HFP）作为外层，混合物代表中间层；数字代表P（VDF-HFP）中的PMMA含量) 显示高在 680 MV/m 下，U _e为 28.71 J/cm ^{3和 η 为 74%。}这项工作为开发具有良好储能性能的电容薄膜提供了一种可行且有效的方法。

更新日期：2022-06-16

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