Modulating electron traps of PEI-based nanocomposites for superb capacitive performance over a broad temperature range

Enhanced High-Temperature Capacitive Energy Storage by 0.55Bi0.5Na0.5TiO3-0.45(Bi0.2Sr0.7)TiO3 Nanofibers in Polyetherimide Nanocomposites

“…The movement of PEI molecular chains intensifies with the increase of temperature, and the migration of internal charge carriers in the electric field accelerates, resulting in a significant increase in heat loss and a decrease in the breakdown electric field. This ultimately leads to a decrease in U dis and η, seriously deteriorating the energy storage performance of nanocomposites. , …”

Thermally activated dynamic bonding network for enhancing high-temperature energy storage performance of PEI-based dielectrics

“…5,13,23 However, according to the Schottky injection formula, the injections and movements of charge carriers become active with increased temperature, which inevitably intensify material deformation. 17 Meanwhile, the conjugated segments in PEI endow the carriers with high conduction at high electric field, resulting in drastically increased conduction loss with the coupling effect of hightemperature. 11 Finally, the energy storage performance of pristine PEI at high-temperature can hardly meet the expectations.…”

“…Recently, great efforts have been made to achieve excellent energy storage performance of PEI. Various intelligent strategies such as introducing wide bandgap inorganic nanofillers, 9,24 constructing polymer-based composites with multilayers 6,25,26 or smart filler-matrix interfacial regions, 6,17,27 and designing crosslinking structural all-organic polymers 28,29 were extensively adopted to enhance high-temperature energy storage performances of polymer-based composites. For example, the charge carrier transportation could be efficiently suppressed by establishing trap sites in the PEI-based composites through the crosslinked molecular structures or the filler-matrix interfaces.…”

“…For example, the charge carrier transportation could be efficiently suppressed by establishing trap sites in the PEI-based composites through the crosslinked molecular structures or the filler-matrix interfaces. 17,29 The rational inorganic-organic multilayer design could intrinsically suppress the injection of charge carriers. 25 All these attempts have achieved exhilarating results, elevating the hightemperature energy storage density (U e ) and charge-discharge efficiency (Z) of PEI-based dielectrics to an unprecedented level.…”

“…Various dielectric polymers have been explored to address this issue, for example, polyimide (PI), [13][14][15][16] polyetherimide (PEI), [17][18][19] polycarbonate (PC), 20 fluorene polyester (FPE) 21 and divinyltetramethyldisiloxane-bis(benzocyclobutene) (BCB). 22 Among them, PEI has been widely acknowledged to be the appropriate linear dielectric for preparing the high-temperature dielectric capacitors owing to its excellent thermal stability and a School of Material Science and Engineering, Shaanxi Key Laboratory of Green This work proposed a novel method for enhancing high-temperature energy storage performances of polymer-based dielectrics by constructing a multisite bonding network within the polyetherimide (PEI) through the use of metal organic frameworks (MOFs).…”