Significantly Improved Energy Storage Performance of PVDF Ferroelectric Films by Blending PMMA and Filling PCBM

Abstract

The increasing energy problem and the demand of environmental protection raise higher requirements for the development of clean energy. Dielectric capacitors have attracted lots of attention as a supporting facility of energy storage and conversion for clean energy, but their further development is limited by the low energy storage performance. In this paper, all-organic composite dielectrics were reported, with a poly­(methyl methacrylate) (PMMA)/poly­(vinylidene fluoride) (PVDF) composite dielectric with different mixing ratios as the matrix and the organic molecular semiconductor with high electron affinity [6,6]-phenyl C61 butyrate acid methyl ester (abbreviated as PCBM) as fillers. The related test results show that with the increase in the doping contents of PCBM, the energy storage density increases obviously. When the doping content of PCBM is 0.9 wt %, the PMMA/PVDF-based organic composite dielectric possesses an optimal breakdown field of 685.67 kV mm–1, accompanying excellent energy storage performances (Ue , ∼21.89 J cm–3; η, ∼70.34%). The PVDF blended with PMMA strategy not only restrains the ferroelectric polarization loss of PVDF but also improves the breakdown strength of the polymer. More importantly, the polarization and breakdown strength of the composites can be synergistically enhanced by filling with PCBM fillers.

Energy Storage Application of All-Organic Polymer Dielectrics: A Review

“…This minimized the structural defects introduced by the molecules and improved the composite dielectric’s polarization and breakdown strength synergistically. By doping 0.9 wt% PCBM, excellent energy storage properties (U e ~21.89 J/cm 3 ; η ~70.34%) were obtained under a 680 MV/m field intensity [ 131 ].…”

Recent progress on dielectric polymers and composites for capacitive energy storage

“…Small organic molecules have also been added to fluoropolymers to improve the energy storage performance. Rahimabady et al reported a surprisingly high breakdown strength (868 MV/m) in allorganic films composed of VDF oligomer and poly(vinylidene fluoride) (PVDF) [130] . A maximum polarization of 162 mC/m 2 is obtained since the coexistence of long and short PVDF chains facilitates the dense packing of rigid amorphous phase.…”

Optimizing nanostructures to achieve enhanced breakdown strength and improved energy storage performances in dipolar polymers

“…The charge-discharge efficiency and discharged energy density of the PVDF-390 film are compared with those of pristine PVDF films in other recently published works [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] in Fig. 13, showing that the PVDF film irradiated with 390 kGy outperforms those other pristine PVDF films.…”