BaTiO3 internally decorated hollow porous carbon hybrids as fillers enhancing dielectric and energy storage performance of sandwich-structured polymer composite

Enabling High‐Energy‐Density High‐Efficiency Ferroelectric Polymer Nanocomposites with Rationally Designed Nanofillers

“…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%.…”

“…Poly(vinylidene fluoride) (PVDF)‐based ferroelectric polymers are considered as the most promising class of dielectric materials for high‐energy‐density capacitors because of their largest K , that is, >10 at 1 kHz, among the current dielectric polymers. [ 19–24 ] To further improve K and the breakdown strength of ferroelectric polymers, a variety of nanostructured fillers ranging from wide‐bandgap boron nitride nanosheets (BNNSs) [ 25–27 ] and semiconductors [ 28,29 ] such as titanium dioxide (TiO 2 ) and tantalum pentoxide (Ta 2 O 5 ) to high‐ K perovskite ceramics [ 30–34 ] including barium titanate (BaTiO 3 ), barium strontium titanate (BaSr x Ti 1−x O 3 ), and barium zirconium titanate (BaZr x Ti 1−x O 3 ) have been introduced into PVDF and its binary and ternary polymers. For example, Li et al.…”

“…A large β value corresponds to a narrow data spread. Remarkably, the introduction of the oxide NPs improves concurrently the E b and β of the polymer composites, for example, from 428 MV m −1 and 8 33. of P(VDF-HFP) to 501 MV m −1 and 11.8 of P(VDF-HFP)/3 vol%-TiO 2 , 562 MV m −1 and 11.3 of P(VDF-HFP)/5 vol%-SiO 2 , and 606 MV m −1 and 13.4 of P(VDF-HFP)/5 vol%-Al 2 O 3 , as shown in Figure 1b.…”

Largely enhanced dielectric properties of polymer composites with HfO2 nanoparticles for high-temperature film capacitors

“…In order to enhance capacitive energy densities, inorganic nanofillers with high dielectric constants have been introduced to form dielectric polymer composites [20][21][22][23][24][25][26]. Polymer composites consisting of ceramic fillers with high dielectric constants, e.g., barium titanate (BaTiO 3 ) [27,28] and copper titanate calcium (CaCu 3 Ti 4 O 12 ), indeed exhibit improved electric displacement, but usually at the expense of much compromised breakdown strength [29,30]. For example, by adding 20 vol% BaTiO 3 nanoparticles into PVDF, the dielectric constant of the nanocomposite is almost doubled.…”

Enhanced dielectric constant and energy density in a BaTiO3/polymer-matrix composite sponge

“…are heavily dependent on energy storage units because of their intermittent nature. Among all kinds of energy storage technologies, the most environmentally friendly and long-used electrostatic capacitor has actively pursued in recent years, which is broadly applied in various fields, like automotive industries, computer systems as well as electronic weapons [1][2][3][4] . With continuous efforts on miniaturization and lightweight of electronic products, the demand for dielectrics possessing high-energy densities and low losses is increasing.…”