Abstract:Novel Ag@BaTiO3@PDA@Ag/P(VDF-HFP) composite films exhibited excellent discharged energy density (17.25 J cm−3) and ultrafast discharge time (∼139 ns).
“…Even more impressively, an ultrahigh η of 83.4% at 700 MV m −1 is achieved in the solution‐processed P(VDF‐HFP) composite with Al 2 O 3 NPLs. To our knowledge, this value not only far exceeds those obtained in solution‐processed ferroelectric polymer nanocomposites (Figure 4c,d) [ 25,26,35,50–61 ] but also outperforms the highest values of the ferroelectric polymer nanocomposites prepared by complicated procedures, including electrostatic spinning of composite precursors, [ 30–32,40 ] post‐synthetic modification of nanostructured fillers, [ 33,34,36 ] and mechanical press of multi‐layered films processes with multiple steps, [ 33,62 ] as summarized in Table S4, Supporting Information. Intriguingly, as summarized in Figure 4c, the ferroelectric polymer nanocomposites containing low‐ K fillers such as BNNS with K composite / K matrix <1 normally exhibit η of <78%, [ 25 ] whereas the nanocomposites loaded with high‐ K fillers such as BaTiO 3 with K composite / K matrix value >1 generally have η of <70%.…”
Ferroelectric polymers have been regarded as the preferred matrix for high‐energy‐density dielectric polymer nanocomposites because of their highest dielectric constants among the known polymers. Despite a library of ferroelectric polymer‐based composites having been demonstrated as highly efficient in enhancing the energy density, the charge–discharge efficiency remains moderate because of the high intrinsic loss of ferroelectric polymers. Herein, a systematic study of the oxide nanofillers is presented with varied dielectric constants and the vital role of the dielectric match between the filler and the polymer matrix on the capacitive performance of the ferroelectric polymer composites is revealed. A combined experimental and simulation study is further performed to specifically investigate the effect of the nanofiller morphology on the electrica properties of the polymer nanocomposites. The solution‐processed ferroelectric polymer nanocomposite embedded with Al2O3 nanoplates exhibits markedly improved breakdown strength and discharged energy density along with an exceptional charge–discharge efficiency of 83.4% at 700 MV m−1, which outperforms the ferroelectric polymers and nanocomposites reported to date. This work establishes a facile approach to high‐performance ferroelectric polymer composites through capitalizing on the synergistic effect of the dielectric properties and morphology of the oxide fillers.
“…Even more impressively, an ultrahigh η of 83.4% at 700 MV m −1 is achieved in the solution‐processed P(VDF‐HFP) composite with Al 2 O 3 NPLs. To our knowledge, this value not only far exceeds those obtained in solution‐processed ferroelectric polymer nanocomposites (Figure 4c,d) [ 25,26,35,50–61 ] but also outperforms the highest values of the ferroelectric polymer nanocomposites prepared by complicated procedures, including electrostatic spinning of composite precursors, [ 30–32,40 ] post‐synthetic modification of nanostructured fillers, [ 33,34,36 ] and mechanical press of multi‐layered films processes with multiple steps, [ 33,62 ] as summarized in Table S4, Supporting Information. Intriguingly, as summarized in Figure 4c, the ferroelectric polymer nanocomposites containing low‐ K fillers such as BNNS with K composite / K matrix <1 normally exhibit η of <78%, [ 25 ] whereas the nanocomposites loaded with high‐ K fillers such as BaTiO 3 with K composite / K matrix value >1 generally have η of <70%.…”
Ferroelectric polymers have been regarded as the preferred matrix for high‐energy‐density dielectric polymer nanocomposites because of their highest dielectric constants among the known polymers. Despite a library of ferroelectric polymer‐based composites having been demonstrated as highly efficient in enhancing the energy density, the charge–discharge efficiency remains moderate because of the high intrinsic loss of ferroelectric polymers. Herein, a systematic study of the oxide nanofillers is presented with varied dielectric constants and the vital role of the dielectric match between the filler and the polymer matrix on the capacitive performance of the ferroelectric polymer composites is revealed. A combined experimental and simulation study is further performed to specifically investigate the effect of the nanofiller morphology on the electrica properties of the polymer nanocomposites. The solution‐processed ferroelectric polymer nanocomposite embedded with Al2O3 nanoplates exhibits markedly improved breakdown strength and discharged energy density along with an exceptional charge–discharge efficiency of 83.4% at 700 MV m−1, which outperforms the ferroelectric polymers and nanocomposites reported to date. This work establishes a facile approach to high‐performance ferroelectric polymer composites through capitalizing on the synergistic effect of the dielectric properties and morphology of the oxide fillers.
“…7 b, due to decreasing the interface relaxation polarization loss, the dielectric loss of the NC films decreases as frequency increases in the 10 2 –10 4 Hz range. However, in the 10 4 –10 6 Hz range, the dielectric loss increases sharply as frequency increases due to the α a relaxation related to the PVDF glass transition 42 , 43 . Figure 7 Frequency dependence of ( a ) permittivity and ( b ) dielectric loss of pristine PVDF and the TiO 2 @SrTiO 3 @PDA NWs/PVDF NCs.…”
In recent years, high energy density polymer capacitors have attracted a lot of scientific interest due to their potential applications in advanced power systems and electronic devices. Here, core–shell structured TiO2@SrTiO3@polydamine nanowires (TiO2@SrTiO3@PDA NWs) were synthesized via a combination of surface conversion reaction and in-situ polymerization method, and then incorporated into the poly(vinylidene fluoride) (PVDF) matrix. Our results showed that a small amount of TiO2@SrTiO3@PDA NWs can simultaneously enhance the breakdown strength and electric displacement of nanocomposite (NC) films, resulting in improved energy storage capability. The 5 wt% TiO2@SrTiO3@PDA NWs/PVDF NC demonstrates 1.72 times higher maximum discharge energy density compared to pristine PVDF (10.34 J/cm3 at 198 MV/m vs. 6.01 J/cm3 at 170 MV/m). In addition, the NC with 5 wt% TiO2@SrTiO3@PDA NWs also demonstrates an excellent charge–discharge efficiency (69% at 198 MV/m). Enhanced energy storage performance is due to hierarchical interfacial polarization among their multiple interfaces, the large aspect ratio as well as surface modification of the TiO2@SrTiO3 NWs. The results of this study provide guidelines and a foundation for the preparation of the polymer NCs with an outstanding discharge energy density.
“…Simultaneously, the low value of conductivity ( σ < 10 −5 S m −1 ) and dielectric loss (tan δ = 0.11) are achieved at 1 kHz. Pan et al [ 40 ] creatively proposed a design of polymer nanocomposites consisting of Ag@BaTiO 3 @polydopamine@Ag nanofibers dispersed in P(VDF‐HFP) matrix. The polymer nanocomposites display excellent comprehensive dielectric performances, and the composite film with 3 vol% fillers shows a high discharged energy density of ~17.25 J/cm 3 @ 480 MV m −1 and retains a higher efficiency of 62.7% by comparison.…”
Polymer nanocomposites with high energy‐storage capability have been widely used in electronic devices. To achieve further enhanced energy density, developing nanofillers with tailored compositions and nanostructures is demonstrated to be an effective strategy. Especially, hybrid nanoparticles (NPs) with abundant internal interfaces are acknowledged as a promising candidate. Here, a class of carbon/silica hybrid nanoparticles (C/SiO2 h‐NPs) with disorderly mixed nanostructures are synthesized and employed to prepare C/SiO2 h‐NPs/polyimide nanocomposites. To reveal the influence of internal interfaces on dielectric properties, a series of comparative composites co‐filled with C and SiO2 NPs are also prepared. The breakdown strength of the C/SiO2 h‐NPs/polyimide composites can reach 303.96 kV/mm, which is over 200% that of their counterparts. It is believed that the abundant heterogeneous interfaces inside the C/SiO2 h‐NPs can effectively impede the development of conductive paths, thereby obviously enhancing breakdown strengths. Furthermore, the C/SiO2 h‐NPs/polyimide composite with 5 wt% C/SiO2 h‐NPs demonstrates a high discharged energy density of ~0.612 J/cm3 at 150 kV/mm, which is about 2.29 times higher than pure polyimide (PI) (~0.267 @ 150 kV/mm), along with a high discharge energy efficiency of 85.9%. This work offers a practicable strategy for the design of functional NPs toward high‐performance dielectric composites.
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