Toward Excellent Energy Storage Performance via Well-Aligned and Isolated Interfaces in Multicomponent Polypropylene-Based All-Organic Polymer Dielectric Films

Abstract

Polypropylene (PP) serves as an excellent commercialized polymer dielectric film owing to its high breakdown strength, excellent self-healing ability, and flexibility. However, its low dielectric constant causes the large volume of the capacitor. Constructing multicomponent polypropylene-based all-organic polymer dielectric films is a facile strategy for achieving high energy density and efficiency simultaneously. Thereinto, the interfaces between the components become the key factors that determine the energy storage performance of the dielectric films. In this work, we propose to fabricate high-performance polyamide 513 (PA513)/PP all-organic polymer dielectric films via the construction of abundant well-aligned and isolated nanofibrillar interfaces. Laudably, a significant enhancement in the breakdown strength is achieved from 573.1 MV/m of pure PP to 692.3 MV/m with 5 wt % of PA513 nanofibrils. Besides, a maximum discharge energy density of about 4.4 J/cm 2 is realized with 20 wt % of PA513 nanofibrils, which is about 1.6-folds higher than pure PP. Simultaneously, the energy efficiency of samples with modulated interfaces maintains higher than 80% up to 600 MV/m, which is much higher than pure PP of about 40.7% at 550 MV/m. This work provides a new strategy to fabricate high-performance multicomponent all-organic polymer dielectric films on an industrial scale.

Improved energy storage properties of polypropylene-based composite dielectrics by introducing surface-charged BaTiO3@chitisan ultrafine constructions

“…8b, compared with the recently reported studies concentrating on the PP-based composite dielectrics, the BaTiO 3 @CS/PP composite prepared in this study displays excellent energy storage capability at a very tiny fraction of filler incorporation. 19–21,24,51–57 As demonstrated in Fig. S13 (ESI†), it is worth noting that compared with the reported counterparts, the BaTiO 3 @CS/PP composite shows excellent relative enhancements in both E b and U e .…”

“…15–18 However, the low ε r of polymeric linear dielectrics does greatly limit their energy storage density to a low level, which is detrimental to the practical application in miniaturized and integrated power electronic systems. 19–21 To deal with this problem, in recent decades, a number of composite dielectrics were prepared by incorporating various high- ε r inorganic nanofillers into different polymer matrices, aiming to merge the superiorities of these different phases and to achieve synchronous improvement in both ε r and E b in composite dielectrics. 22–25 However, due to the significant difference in ε r between polymer matrices and high- ε r ceramic fillers, the localized electric field at the heterogeneous interface would be re-distributed non-uniformly, resulting in the accumulation of charges at the interface and the occurrence of premature breakdown in composites.…”

Enhanced Energy Storage Properties of Polypropylene through Crystallization Modulation

“…(a) D – E loops at Weibull breakdown strength, (b) discharged energy density and charge–discharge efficiency, (c) charge–discharge cycling experiment of polypropylene and the composite films with different contents of WBG, and (d) comparison of the maximum breakdown strength and the maximum discharged energy density above 90% efficiency. − …”

PEI-based all-organic composite films with simultaneous excellent energy storage density and high efficiency

“…, commercial BOPP films have a U e of only 1–2 J cm −3 ), which narrows the scope of potential applications for organic dielectrics. 11–13 In recent years, researchers have primarily enhanced the ε r of composites by incorporating ceramic fillers with high ε r , such as barium titanate (BT), bismuth sodium titanate (NBT), and potassium sodium niobate (KNN), resulting in a relatively high energy density. 14–16 Nevertheless, the significant difference in surface energy between inorganic fillers and organic matrices can reduce the breakdown voltage of composites.…”

“…Despite the extensive research efforts to address this issue, the U e of the investigated all-organic composites generally remains below 12 J cm −3 when η is above 92%, a level closer to practical application. 12,23,29–32 To tackle this issue, in this work, PVDF known for its high ε r , and PEI, valued for its high η , were chosen to fabricate PVDF/PEI bilayer composite films. The bottom layer consists of pure PEI, contributing to the high η of the composite film and ensuring a high breakdown electric field ( E b ).…”