Enhanced energy storage of polyvinylidene fluoride‐based nanocomposites induced by high aspect ratio titania nanosheets

Abstract

To enhance the discharge energy density (Ue) of polyvinylidene fluoride (PVDF), two‐dimensional (2D) titania nanosheets (TNSs) with high aspect ratio were introduced into PVDF. The results show that the TNSs are uniformly dispersed in matrix and the existence of matrix‐filler interface is confirmed by small angle X‐ray scattering. Introducing of high aspect ratio TNSs is beneficial to enhance the concentration of polar β‐phase and interfacial polarization, which can improve the permittivity (εr) of nanocomposites. Meanwhile, the shape of 2D TNSs plays an important role in enhancement of breakdown strength (Eb). The εr and Eb of the nanocomposites are two significant factors of their high energy storage performance. Therefore, the Ue increases to 0.32 J/cm3, which is 28% higher than that of pure PVDF (~0.25 J/cm3). The energy efficiency of this typical nanocomposite is similar as that of pure PVDF (~90%). This work might provide a method of fabricating promising energy storage dielectric materials.

Enhanced Energy Storage Performance of PVDF-Based Composites Using BN@PDA Sheets and Titania Nanosheets

“…The PVDF/BN@PDA binary composites without STNSs were prepared and tested for comparison. The results show that the ternary polymer-based composites possess simultaneously increased permittivity and breakdown strength that lead to excellent energy storage performance in comparison with PVDF/BN@PDA binary composites and our previous work [22]. This work provides an easy route for the use of 2D fillers to improve the energy density of composites.…”

Atomic layer deposition fabricated core–shell nanostructures for enhanced polyetherimide composite dielectrics

“…[16][17][18] PEI also has intrinsic dielectric breakdown strength (>400 kV mm À1 ) and a dielectric constant (3.15), higher than that of BOPP (2.2). 19 On the other hand, the novel ller design and composite engineering with dilute llers have become the primary investigations in previous works such as common llers, 20,21 nanosheets, 22,23 nanobelts, 24 nanobers, 18 multilayer structure, 25 and core-shell particles. 6,26 Among them are outstanding nanoparticles like Al 2 O 3 , BaTiO 3 , SiO 2 , and BN.…”

Piezoelectric sensor based on electrospun poly(vinylidene fluoride)/sulfonated poly(1,4‐phenylene sulfide) blend nonwoven fiber mat

“…In addition, the piezoelectric effect in stretched and poled PVDF film is much higher than in its as‐cast film due to higher β ‐crystalline content 3,4 . β ‐crystalline content in PVDF can be increased in many different ways such as the addition of nanoparticles, 5–10 nanotubes, 11 and metal salts 12,13 …”

“…In addition, the piezoelectric effect in stretched and poled PVDF film is much higher than in its as-cast film due to higher β-crystalline content. 3,4 β-crystalline content in PVDF can be increased in many different ways such as the addition of nanoparticles, [5][6][7][8][9][10] nanotubes, 11 and metal salts. 12,13 Recent advances in electrospinning instrumentation have resulted in rapid improvement of nonwoven fiber mat fabrication with controlled morphology and properties.…”