Enhancement of Energy Storage Performance of PMMA/PVDF Composites by Changing the Crystalline Phase through Heat Treatment

Abstract

In today’s contemporary civilization, there is a growing need for clean energy focused on preserving the environment; thus, dielectric capacitors are crucial equipment in energy conversion. On the other hand, the energy storage performance of commercial BOPP (Biaxially Oriented Poly‒propylene) dielectric capacitors is relatively poor; hence, enhancing their performance has drawn the attention of an increasing number of researchers. This study used heat treatment to boost the performance of the composite made from PMAA and PVDF, combined in various ratios with good compatibility. The impacts of varying percentages of PMMA‒doped PMMA/PVDF mixes and heat treatment at varying temperatures were systematically explored for their influence on the attributes of the blends. After some time, the blended composite’s breakdown strength improves from 389 kV/mm to 729.42 kV/mm at a processing temperature of 120 °C. Consequently, the energy storage density is 21.12 J/cm3, and the discharge efficiency is 64.8%. The performance has been significantly enhanced compared to PVDF in its purest state. This work offers a helpful technique for designing polymers that perform well as energy storage materials.

Improved Energy Storage Performance of Composite Films Based on Linear/Ferroelectric Polarization Characteristics

“… Comparison of the energy density U d and charge/discharge efficiency η of this work’s PVTC/BOPP(67%) bilayer film and previously reported results [ 22 , 34 , 35 , 36 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. …”

“…In order to further investigate the factors that influence energy storage, the breakdown performance of the bilayer film was tested. Following a linear fit of the data, the Weibull distribution curve was generated [ 34 , 35 ], as shown in Figure 2 c. The data analysis has revealed that the introduction of linear polymers results in an increase in the breakdown field strength ( E b ) of the PVTC/BOPP bilayer film relative to the pristine PVTC film (ca. 350 kV/mm).…”

Broadband dielectric behaviour and structural characterization of PVDF/PMMA/OMMT polymer nanocomposites for promising performance nanodielectrics in flexible technology advances

“…For the 80PVDF/20PMMA blend matrix, the marginal changes in the lower frequency range εʹ values attributed to some variations in the polarization contributed by Maxwell-Wagner-Sillars (MWS) type interfacial polarization (IP) process. A slow decrease in εʹ values with the increase of frequency is expected because of the similar type of dielectric dispersion behaviour of the pure PVDF film [46,58,62] and a little change in the εʹ values of pristine PMMA film in the same frequency range [31,41,46]. This IP effect represents the accumulation of some long to short distance travelled charges at the interface regions of the polymer crystallites and amorphous domains and also the polymer and nanoclay interfaces [15,25,28,63,64].…”

Achieving Higher Dielectric and Energy Storage Performances of Methyl Methacrylate-co-glycidyl Methacrylate Films through the Nanocomposite Strategy

“…Various strategies, such as multilayer structure, electrospinning, heat treatment, etc. were used to improve the performance of the composite films. − On the other hand, nanoparticles such as BaTiO 3 and Ba 0.5 Sr 0.5 TiO 3 were utilized to enhance the dielectric and energy storage of PMMA. , The difficulty that needs to be solved for the nanocomposite dielectric films is how to achieve uniform dispersion of nanoparticles in the matrix. In addition to the above methods, copolymerization technology provides another feasible strategy for improving the performance of PMMA.…”