Suppressing charge injection and preventing the extension of electrical trees of polymer-based composites through two-dimensional metal–organic frameworks nanosheets

Superior capacitive performance achieved in wide HOMO–LUMO gap cyanoethyl cellulose nanocomposites via forming a built-in electric field

“…Based on organic/inorganic composites, the lower defect content favors the stability, and the excellent stability performance of 0.2 wt% BFO@AO/CRC films confirmed its outstanding compatibility between the filler with the polymer, as shown in Fig. 4d 7,37–43 A considerable power density and ideal charge/discharge rates allow electrostatic capacitors to be used in electromagnetic artillery, high-voltage cables, and other applications. Fast charge–discharge tests of CRC and its nanocomposites were performed at 180 MV m −1 DC voltage, as shown in Fig.…”

“…4,5 Ferroelectric polymers (PVDF) are hampered by larger dielectric loss (tan δ ) and lower E b . 6,7 Meanwhile, most applied dielectric polymers belong to petroleum derivatives having a non-biodegradable and non-renewable, which are not sustainable and contrary to the concept of protecting the environment. 8 Consequently, there is an urgent need to construct novel dielectric materials to increase the U d of electrostatic polymer capacitors.…”

Optimizing the gradient of electric field distribution and inhibiting charge injection in multilayer dielectric films for high capacitive performance

“…The huge increment ratio in U d and E b shows certain advantages as compared in Fig. 3c, 14,29–37 i.e. , the U d has a 384% increase from P(VDF-HFP) to PP-2 and 272% increase from PESU to PP-2, and the E b has a 135% increase from P(VDF-HFP) to PP-2 and 65% increase from PESU to PP-2.…”

“…In our previous work, we constructed nanocomposites composed of Ni-MOF and P(VDF-HFP) and successfully increased breakdown strength ( E b ) from 350 MV m −1 of the pristine matrix to 600 MV m −1 . It is noteworthy that the η only reached 67.9%, 14 and it obviously leaves considerable room for improvement. The groundbreaking sandwich design of Li et al provided design routes, and the composite films consisting of boron nitride nanosheets (BNNSs) and cross-linked divinyltetramethyldisiloxane-bis(benzocyclo-butene) (c-BCB) were further optimized to become qualified high-temperature dielectric materials.…”

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

“…34 In addition to the filler size, very recently, several research groups revealed that incorporating fillers with high electron affinity into polymeric dielectrics is an effective strategy for synergistic improvement in both E b and U d values of dielectric composites. [35][36][37][38][39][40][41] For instance, Li et al embedded different molecular semiconductors (ITIC, PCBM and DPDI) with high electron affinity into a polyetherimide (PEI) matrix. It was found that the U e values for the composite dielectrics were enhanced to 3.4-4.5 J cm À3 at 150 1C, whereas that of neat PEI was only 1.0 J cm À3 .…”