Interface-modulated nanocomposites based on polypropylene for high-temperature energy storage

Bilayer-Structured Polymer Nanocomposites Exhibiting High Breakdown Strength and Energy Density via Interfacial Barrier Design

“…This work demonstrates that by designing the spatial organization of fillers with different electrical and dielectric properties in the layered polymer composites, one can significantly enhance the capacitive performance by using low-cost commodity polymers. (PP/BT@EPDM), 22 PP filled with poly(methyl methacrylate) coated BaTiO3 (PP/BT@PMMA), 54 PP filled with polyhedral oligomeric silsesquioxane coated BaTiO3 (PP/BT@POSS), 31 PP filled with PP-graft-maleic anhydride modified MgO (PP/MgO-mah-PP), 32 polyimide filled with BaTiO3 nanoparticles (PI/BT), 30 poly(methyl methacrylate) filled with Ba0.5Sr0.5TiO3 nanoparticles (PMMA/BST), 29 polyethylene filled with organomontmorillonite (PE/MMT), 55 poly(arylene ether sulfone)-containing side propenyl groups (DPAES) filled with benzocyclobutene modified BaTiO3 (DPAES/BT-BCB), 56 PS filled with polyethyleneimine modified Ca2Nb3O10 nanosheets (PS/CNO-PEI). 53 Change rate of discharged energy density BOPP and the bilayered PS/TiO2/Al2O3 nanocomposite.…”

“…Remarkably, the Ue of 4.43 J/cm 3 obtained in the bilayered nanocomposite, is not only ~112% and ~71% greater than pristine polymer (2.09 J/cm 3 ) and the single-layered nanocomposite (2.59 J/cm 3 ) but also among the best of the nanocomposites based on linear polymer matrices (e.g., 3.86 J/cm 3 of PP-based and 4.1 J/cm 3 in PS-based nanocomposite) reported so far (Figure 4(e)). 22,[29][30][31][32][53][54][55][56] To evaluate the discharge rate of the polymer nanocomposite, fast discharge test has been conducted using a typical high-speed capacitor circuit at identical resistor-capacitor (RC) time constant. The power density (P) of dielectric materials is derived from the following equation…”

“…[28][29][30][31] On the other hand, the incorporation of widebandgap nanofiller with a moderate k (e.g., [8][9][10][11][12][13][14][15][16][17][18][19][20], e.g., aluminium oxide (Al2O3) and magnesium oxide (MgO), is found effective in impeding the leakage current and reducing energy loss without significant deteriorations in k and the breakdown strength of the polymer composites. [32][33][34][35][36] Moreover, compared to zero-dimensional (0-D) Al2O3 nanoparticles and one-dimensional (1-D) Al2O3 nanowires, it was verified that the parallelly arranged two-dimensional (2-D) Al2O3 nanoplates are capable of dispersing the applied electric field throughout the polymer matrix and preventing the propagation of breakdown channels, resulting in higher breakdown strength and smaller leakage current of the polymer nanocomposites. 36 More recently, it has been corroborated experimentally and theoretically that the dielectric properties such as relaxation behavior and breakdown strength, as well as energy storage performance of dielectric films, can be readily modulated by systematically varying the interfaces, chemical ratios, and structures of the constituent layers in the layered dielectric films.…”

Dielectric polymers for high-temperature capacitive energy storage

“…Recently, breakthrough results have been achieved by using wide bandgap inorganic fillers to inhibit charge injection and conduction in polymers. 6,61,[67][68][69][70][71][72][73][74][75] The resulting dielectric polymer composites exhibit remarkable capacitive performance at high temperatures, far exceeding the current dielectric polymers. Different from prior reviews covering the high-temperature dielectric polymer composites, 47,48,58,59,[76][77][78][79] this article exclusively focuses on the recent innovations in all-organic dielectric polymers that are designed for capacitive energy storage applications at high electric field and high temperature (i.e., ≥ 200 MV m -1 and ≥ 120 °C ).…”

Research Progress of All Organic Polymer Dielectrics for Energy Storage from the Classification of Organic Structures

“…They are widely used in power electronic equipment, such as wind power, hybrid electric vehicles, pulse power supplies, etc., owing to their high reliability, fast charge‐discharge velocity, lightweight as well as low‐cost. [ 1–5 ] Increasing demand for energy storage and conversion pursue high‐performance polymer film capacitors. [ 6 ]…”