Abstract
In current, the energy storage materials based on electrets and ferroelectric polymers are urgently demanded for electric power supply and renewable energy applications. The high energy storage density can be enhanced by conducting or inorganic fillers to ferroelectric polymer matrix. However, agglomeration, phase separation of fillers, interfacial phase regions and crystallinity of matrix remain the main factors for the improvement of energy storage density in those composites. Poly(vinylidene fluoride-hexafluoropropylene) was modified with graphene nanoplatelets for enhanced the dielectric properties and energy storage density, which combines the irradiated by electron beam. Tuning effect of the crystalline regions and polar phases with graphene nanoplatelets and electron irradiation on its surface, structure, electrical and energy storage properties were observed. The film homogeneity was increased by reducing the pores, along with the improvement of surface roughness and hydrophobicity, which related with the dielectric properties and energy storage density. The β-phase fraction and crystallinity improvement significantly affect electrical properties by improving polarization and dielectric constant. As a core, electron beam dramatically reduce the crystals size by two times. Hence, energy storage density of composites was enhanced, while energy loss was reduced under operating conditions. Results on the improvement of energy efficiency were from 68.11 to 74.66% for neat poly(vinylidene fluoride-hexafluoropropylene) (P(VDF-HFP)), much higher than previously reported of 58%, and doubled for P(VDF-HFP)/GNPs composites which will be discussed and evaluated for the practical energy storage materials.
Highlights
The demand for energy storage components such as capacitors and batteries for electric power supply and renewable energy applications is growing drastically [1]
Biaxially oriented polypropylene (BOPP), the polymer most often used in capacitors, has a high breakdown strength (7500 kV/cm) [5] and a low dielectric loss at 1 kHz (0.0002), but a low energy density and poor energy efficiency [6]
The low energy density of biaxially oriented polypropylene (BOPP) is associated with its low dielectric constant
Summary
The demand for energy storage components such as capacitors and batteries for electric power supply and renewable energy applications is growing drastically [1]. Dielectric materials have high power density which accommodates fast charging and discharging process [4]. Their application in energy storage components is limited by their low energy density. Biaxially oriented polypropylene (BOPP), the polymer most often used in capacitors, has a high breakdown strength (7500 kV/cm) [5] and a low dielectric loss at 1 kHz (0.0002), but a low energy density and poor energy efficiency [6]. The relatively high dielectric constant and breakdown strength of polyvinylidene fluoride (PVDF) and its copolymers and terpolymers are excellent electroactive properties for energy storage components [7], but, despite being considered superior to other dielectric ferroelectric materials, PVDF-based materials have a relatively high dielectric loss and high energy loss, which limits their applications. A brief summary of the electrical properties of some various polymers was presented by Table 1
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
