Simultaneously enhanced discharge energy density and efficiency in nanocomposite film capacitors utilizing two-dimensional NaNbO₃@Al₂O₃ platelets

Abstract

Nanocomposite films loaded with small 2D NaNbO3@Al2O3 platelets exhibit a high discharge energy density of 14.59 J cm−3 and simultaneously an outstanding discharge efficiency of 70.1%.

Significant Improvements in Dielectric Constant and Energy Density of Ferroelectric Polymer Nanocomposites Enabled by Ultralow Contents of Nanofillers

“…Comparatively, the earlier results on the polymer nanocomposites with high‐ K fillers such as BaTiO 3 , TiO 2 , and SrTiO 3 exhibit K values of less than 12 (Figure 1b) at low filler concentrations (≤2.5 vol%). [ 6–9,42 ] The 100% enhancement in K over that of polymer matrix obtained in this work is the record value reported in the polymer nanocomposites with low filler loadings (≤3 vol%). [ 6–9,33,36–38,43 ] In stark contrast, ≥10 vol% high‐ K fillers (e.g., BaTiO 3 nanowires) are needed to double the K of the polymer matrix as compared in Figure 1c.…”

“…[ 6–9,42 ] The 100% enhancement in K over that of polymer matrix obtained in this work is the record value reported in the polymer nanocomposites with low filler loadings (≤3 vol%). [ 6–9,33,36–38,43 ] In stark contrast, ≥10 vol% high‐ K fillers (e.g., BaTiO 3 nanowires) are needed to double the K of the polymer matrix as compared in Figure 1c. Given that CZS‐APP fillers have a similar K with P(VDF‐HFP) matrix, the marked raise of K of the composites cannot be explained by the volumetric contribution of the component with a higher K and analyzed by using the volume‐average models, which will be discussed in detail later.…”

“…[ 5 ] The composite approach, in which high‐ K ceramic fillers are added to the polymer matrix, has been one of the most popular approaches to improve the dielectric properties and capacitive performance of polymers. [ 6–9 ] Since the K value of a composite material is a direct volumetric summation of those of the constituents, both experimental and simulation results suggest that the fillers with high loading ratios (>10 vol%) and large K (e.g., 100 times that of polymer matrix) are required for a pronounced raise of K of the composites relative to that of the polymer. [ 10–18 ] On the other hand, the inclusion of large concentrations of high‐ K nanofillers produces highly inhomogeneous distribution of local electric fields, [ 2,19,20 ] and consequently, is accompanied by a sharp reduction in E b , which overshadow the advantages gained by improved K and seriously compromises the U e of the polymer nanocomposites.…”

Rational Design of High-Energy-Density Polymer Composites by Machine Learning Approach

“…Experimental E b , ε r , and U e values belonging to various nanocomposites with different polymer matrixes and nanofillers were collected from existing literatures − ,,− ,− ,− to train the ML models, as shown in Figure . It should be noted that the database only contains composites uniformly filled with a single type of filler and does not consider complex doping schemes such as hybrid fillers and multilayer structures.…”

Bioinspired Hierarchically Structured All‐Inorganic Nanocomposites with Significantly Improved Capacitive Performance

“…The energy storage properties can be derived from the hysteresis loops using an aixACCT system (TF analyzer 2000, Germany). The Weibull breakdown strength can be evaluated by the following equation: [ 35–38 ] where p is the probability of electric failure, E is the measured breakdown strength, E b is the characteristic breakdown strength, and β is the Weibull coefficient indicating the dispersion of the experimental data.…”