Insights into concomitant enhancements of dielectric properties and thermal conductivity of PVDF composites filled with core@double‐shell structured Zn@ZnO@PS particles

Abstract

In order to synchronously improve dielectric permittivity (ε 0 ), breakdown strength (E b ), and thermal conductivity (TC) while inhibiting dissipation factor (tan δ) of raw Zn (Zinc)/PVDF (poly[vinylidene fluoride]) composites, two kinds of core-shell structured particles of Zn@ZnO (zinc oxide) and Zn@ZnO@PS (polystyrene) were synthesized by high-temperature oxidation followed by suspension polymerization, then they were composited with PVDF to elaborately generate morphology-controllable high-ε 0 but low loss, and high TC composites. The results confirm that both the Zn@ZnO/PVDF and Zn@ZnO@PS/PVDF composites show markedly improved ε 0 , suppressed tan δ and conductivity over the original Zn/PVDF because of the induced multiple polarizations in the Zn@ZnO and Zn@ZnO@PS configurations and the barrier effect of constructed shells on direct contact of Zn particles. The second organic PS shell inhibits the loss and conductivity due to its high-electrical resistivity, and further boosts the E b and TC of the composites owing to enhanced interfacial compatibility between the Zn@ZnO and PVDF, which lessens the local electric field distortion and concentration, and therefore, promotes phonon transport across the interfaces through suppressing the thermal interfacial resistance. The prepared Zn@ZnO@PS/PVDF with a high E b and ε 0 but low tan δ, as well as enhanced TC, exhibit appealing potential applications in microelectronic devices and power equipment.

The Progress of Hard Carbon as an Anode Material in Sodium-Ion Batteries

“…The design of novel anode materials with excellent performance and low cost can accelerate the commercialization of sodium-ion batteries [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. Among the many anode electrode materials of sodium-ion batteries, hard carbon materials have the superiority of high capacity, low price, and low working voltage, and their unique structure is conducive to sodium-ion adsorption and reversible embedding/removal, showing excellent sodium storage performance, making them the most likely anode materials to be commercialized [ 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 ]. When commercializing hard carbon materials, troubles such as low first-cycle coulombic efficiency, terrible rate performance, and poor cycle stability are also faced [ 58 , 59 , 60 ].…”

Stretchable Superhydrophobic Supercapacitor with Excellent Self-Healing Ability

“…With the rapid development of wearable devices and smart Internet of Things, flexible electronic devices are playing an increasing role in our daily life. − Accordingly, how to offer energy supply to flexible electronic devices is attracting more and more attention. − Thus, there is an urgent requirement to develop a matching flexible energy storage equipment. Recently, supercapacitors − have been widely utilized due to their high specific capacitance, − excellent power density, − fast charging/discharging ability, , and excellent electrochemical cycle stability. − Furthermore, many flexible polymers have been developed as electrolytes for flexible supercapacitors. , Among them, hydrogels have attracted the most attention due to their viscoelasticity, flexibility, and water content ratio. , For example, Wang et al used glutaraldehyde to chemically cross-link the PVA/H 2 SO 4 hydrogel and then fabricated integrated flexible supercapacitors by coating electrode materials on both sides of the hydrogel …”

Quantum Mechanical Study of the Dielectric Response of V2C-ZnO/PPy Ternary Nanocomposite for Energy Storage Application

“…ZnO nanocomposites have also been studied for their potential use in dielectric applications [32][33][34][35]. PVA/ZnO hybrid nanocomposite films [36], PVDF composites filled with core@double-shell structured Zn@ZnO@PS particles [37], and undoped and co-doped ZnO nanoparticles [32] are a few examples. These materials have shown improved dielectric permittivity, breakdown strength, and thermal conductivity, as well as suppressed dissipation factor and conductivity.…”