Suppressed dielectric loss and enhanced breakdown strength in Ni/PVDF composites through constructing Al2O3 shell as an interlayer

Strategies Involved in Enhancing the Capacitive Energy Storage Characteristics of Poly(vinylidene fluoride) Based Flexible Composites

“…In this regard, modification of filler surface with suitable materials has appeared to be a very useful technique in order to improve the output energy storage characteristics of the final composite film. In fact, it is perhaps the most widely used technique for this purpose [200–205] . Different modifier implies different effect in the PVDF matrix and due to the modification of the PVDF‐filler interface, different effects come into play hence the energy storage performance of the developed composite films is tuned.…”

“…In fact, it is perhaps the most widely used technique for this purpose. [200][201][202][203][204][205] Different modifier implies different effect in the PVDF matrix and due to the modification of the PVDF-filler interface, different effects come into play hence the energy storage performance of the developed composite films is tuned. This section will therefore discuss some of these interface modification techniques and possible ways of achieving further performance enhancement.…”

Towards synchronously improving dielectric performance and thermal conductivity in Ni/PVDF by tailoring core-shell structured Ni@NiO particles

“…Obviously, the ε is seen to increase with raising filler concentration for the composites with Ni and Ni@NiO, which can be considered as the typical percolating composites with conductive fillers. 1,8,[36][37][38] From Figure 5(a), when the Ni filler concentration is less than 20 wt%, the ε of original Ni/PVDF composites rises almost slightly with the filler concentration until to 48, because a small amount filler particle is insufficient to constitute enough micro capacitor, thereby resulting in unimpressive IP effect. The IP effect also is called as the Maxwell-Wagner-Sillars (MWS) effect, occurring at heterogenous phases with different electric conductivities, resulting in free charges accumulate at the interfaces of different phases.…”

“…Thus, the IP effect is response for the enhancement in dielectric permittivity. 6,8,30,[36][37][38][39] Therefore, the use of fillers only offers an insignificant enhancement in ε.…”

“…Besides, the Al 2 O 3 shell lessens the distortion and concentration of local electric field subsequently leading to enhanced E b . 37 Li et al successfully fabricated a SiO 2 layer onto the Ni particles by sol-gel process, and then the obtained Ni@SiO 2 core-shell particles were added into PVDF. Compared with pristine Ni/PVDF, the Ni@SiO 2 /PVDF exhibit a superior performance, such as remarkably suppressed loss and conductivity, attributable to the SiO 2 interlayer between the core Ni particles which effectively prevents them from direct contacts and significantly reduces the leakage loss.…”