Research on structure and properties of MWCNT@PDA/polymer matrix composite films with enhanced energy storage performance

Abstract

MWCNT@PDA/PVDF-TrFE and MWCNT@PDA/PVDF-TrFE-CTFE composite films with high dielectric constant, low dielectric loss and excellent energy storage density were prepared by solution casting method. The best component of composite film (2.0 wt% MWCNT@PDA/PVDF-TrFE-CTFE, named C) was selected as the middle layer of the sandwich structure, and the upper and lower layers were made up by pure PVDF-TrFE film (named A) and pure PVDF-TrFE-CTFE films (named B). By testing and comparing the microstructure and performance of the single-layer composite film and the sandwich structure composite film, the influence of the matrix and structure on the performance of the composite film was discussed. The results showed that the dispersion effect of the filler in the matrix became worse, the dielectric constant gradually increased, the dielectric loss of the composite film did not change significantly, and the energy storage density first increased and then decreased with the increasing of the filler content. At a frequency of 10 3 Hz, the dielectric constants of 2.0 wt% MWCNT@PDA/PVDF-TrFE and 2.0 wt% MWCNT@PDA/PVDF-TrFE-CTFE composite films were 9.00 and 13.88, which were 1.9 and 2.9 times of pure films. When the electric field was 1100 kV/cm, the energy storage density of composite film BCB was 6.36 times of film C.

Enhanced dielectric and energy storage properties of polypropylene by high‐energy electron beam irradiation

“…The dielectric constant, breakdown strength, energy storage for the dielectric materials have a significant influence on the performance of capacitors. [2] Polymer dielectric materials, such as PP, [3] PVDF, and its copolymers, [4][5][6] PE, [7,8] PET, [9] PMMA, [10] PEI [11] have been used due to their flexible mechanical characters, ease of manufacturing and excellent dielectric properties. As a typical representative, polypropylene (PP) dielectric material occupies a considerable proportion of the market share for its cheapness, fine dielectric properties, and mechanical behavior.…”

A composite electrode of 2D‐Ti3C2 (MXene) and polyemeraldine salt of polyaniline for supercapacitor with high areal capacitance

“…[22] Therefore, attempts were made toward compositing the MXene with pseudocapacitive materials like conducting polymers (CP). [23][24][25][26][27] Discussions regarding composites of MXene and CP have dominated research in recent years. [22,[28][29][30][31] Various properties of CPs, such as variable bandgap, water solubility, and processability into different shapes [32][33][34] combined with their pseudocapacitive nature have found to enhance the electrochemical performance of MXene.…”

3D‐printed and foamed triply periodic minimal surface lattice structures for energy absorption applications

“…Current structures that are used in the engineering industry for energy absorption include foams, [1,2] honeycomb, [3,4] and composites. [5,6] All of these structures are cellular materials offering improved specific properties compared to bulk materials owing to their higher surface area. [7,8] Foams are extensively employed because of their desirable mechanical characteristics, low manufacturing cost, and high temperature resistance.…”