Sandwich-structured PPy-TiO2/PVDF composite films with outstanding dielectric properties and energy density

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2022-04-01 DOI:10.1049/nde2.12031

Jinyue Qiu, Ling Weng, Xiaorui Zhang, Yu Su

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引用次数: 8

Abstract

Improving the energy storage density of dielectric capacitors has absorbed extensive attention for energy storage. However, a decrease in breakdown strength may be aroused after the addition of abundant fillers, it is necessary to design the composite film with a sandwich structure without the sacrifice of mechanical properties. The PPy-TiO₂/PVDF monolayer film and PVDF/PPy-TiO₂/PVDF sandwich-structured composite films were successfully prepared via electrospinning and a hot-press treatment. The experiment results show that the dielectric constant of the composite films can be enhanced effectively by adding PPy-TiO₂.When the filling amount is 30 wt%, the energy storage density of PVDF/PPy-TiO₂/PVDF sandwich-structured composite films is outstanding before the breakdown strength, which is higher than that of the pure PVDF film. The energy storage density of PVDF/PPy-TiO₂/PVDF sandwich-structured composite films could be achieved to 2.68 J/cm³ under the electric strength of 1700 kV/cm.

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具有优异介电性能和能量密度的夹层结构PPy - tio2 /PVDF复合薄膜

提高介质电容器的储能密度已引起储能领域的广泛关注。然而，大量填料的加入会引起击穿强度的降低，因此有必要在不牺牲力学性能的前提下设计夹层结构的复合膜。通过静电纺丝和热压处理，成功制备了PPy-TiO2/PVDF单层膜和PVDF/PPy-TiO2/PVDF三明治结构复合膜。实验结果表明，添加py - tio2可以有效地提高复合膜的介电常数。当填充量为30 wt%时，PVDF/ py - tio2 /PVDF三明治结构复合膜在击穿强度前的储能密度突出，高于纯PVDF膜。在1700 kV/cm的电强度下，PVDF/ py - tio2 /PVDF三明治结构复合薄膜的储能密度可达到2.68 J/cm3。

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