Free volume dependence of dielectric behaviour in sandwich-structured high dielectric performances of poly(vinylidene fluoride) composite films

Abstract

Atomic-scale free volume holes have significant effects on the dielectric constant and breakdown strength of polymer composite films.

Interface coupling and energy storage of inorganic–organic nanocomposites

“…When the T g is reached, the This journal is © The Royal Society of Chemistry 2022 free volume of the polymer increases signicantly. 62 A recent study shows that designing polymers with cross-linked structures can improve this phenomenon. 154 2.4.2.…”

“…Currently, a signicant amount of work has been done in the eld of IONC interface coupling, especially in the design of ceramic llers and polymer matrix interfaces, ller surface modication, 34,35 polymer surface functionalization, 25 multiphase doping, 36,37 and other aspects. 38,39 Starting from interface coupling and phase eld theoretical calculations, numerous studies have been conducted on core-shell structures, [40][41][42][43][44] sandwich structures, 22,37,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] and ller 3D network structures, [63][64][65][66][67][68] which break the thinking along the lines of traditional IONC compounds and open up the study of new IONCs. On this basis, some reviews have summarized the theory and origin of inorganic ceramics and polymer matrices for high energy storage performance, 69,70 whereas others have summarized the approaches for interface modication of inorganic ceramics or organic polymer matrices, 53 and the regulation of the interface structure in IONCs.…”

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

“…Polymer dielectrics exhibit great potential in modern advanced power systems and have been paid much attention in the past few decades. [1][2][3] Compared with conventional ceramic dielectrics, polymer dielectrics are endowed with splendid flexibility, light weight, easy processability, etc. Amongst the kinds of polymer dielectrics, dipolar polymers are the most promising candidate for next generation dielectrics in high energy storage capacitors.…”

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

“…Polymers have become a potential dielectric energy storage material by virtue of their high breakdown strength, excellent flexibility, and well processability, which have attracted more and more attention . PVDF and its copolymers are ferroelectric polymers with a high dielectric constant (10–12), which have good chemical stability, abundant crystalline phases, and higher polarization strength. , However, the high residual polarization strength and dielectric loss of PVDF greatly limit the release of stored energy in the process of charge and discharge, leading to a low charge and discharge efficiency (∼55% at 300 kV mm –1 ) and a large amount of unusable heat, which will accelerate the aging and electro-thermal breakdown of the capacitor, greatly limiting its application environment and development prospects. − Therefore, many efforts have been focused on reducing the energy loss and enhancing the discharged energy density of PVDF. − …”