Electrospinning Synthesis of Na0.5Bi0.5TiO3 Nanofibers for Dielectric Capacitors in Energy Storage Application

Abstract

Dielectric composites based on ferroelectric ceramics nanofibers are attracting increasing attention in capacitor application. In this work, the sol–gel method and electrospinning technology are utilized to prepare one-dimensional Na0.5Bi0.5TiO3 (NBT) nanofibers, and the influence of electrospinning process parameters such as spinning voltage, liquid supply rate, and collector speed on the morphology and structure of nanofibers are systematically explored. The final optimized parameters include the applied voltage of 20 kV, the solution flow rate of 1 mL/h, and the collector’s rotation speed of 1500 rpm. The optimized NBT nanofibers are introduced into the PVDF polymer matrix for energy storage application. Owing to the enhanced interfacial polarization between PVDF matrix and NBT nanofibers with a high aspect ratio, the NBT–PVDF nanocomposites achieve a high discharge energy density of 14.59 J cm−3 and an energy efficiency of 53.69% at 490 kV mm−1, which are higher than those of pure PVDF, i.e., 10.26 J cm−3 and 48.17% at 420 kV mm−1, respectively. The results demonstrate that the strategy of synthesizing NBT nanofibers using the electrospinning method is of great potential for high-performance dielectric capacitor application.

Achieving synergistic improvement in dielectric constant and energy storage properties of all-organic liquid crystal molecule/PVDF composites

“…In contrast, the blending method is simpler and more effective in achieving superior energy storage propertiesy of PVDF-based composite films. One way is to incorporate inorganic nanofillers (such as BiFeO 3 , 16 Na 0.5 Bi 0.5 TiO 3 , 17 SrTiO 3 , 18 AgNbO 3 19 and BaTiO 3 20 ) into the PVDF matrix to form inorganic/polymer composites. Unluckily, the huge difference in the physical and chemical properties between inorganic fillers and PVDF matrix directly or indirectly causes some unfavourable factors, 21–23 such as the aggregation of inorganic fillers, holes, cracks and the concentration of electric field, so this method can only strengthen the U d of the composite films to a certain extent.…”

Trilayer PVDF nanocomposites with significantly enhanced energy density and energy efficiency using 0.55Bi0.5Na0.5TiO3-0.45(Sr0.7Bi0.2)TiO3 nanofibers

“…To further determine the sintering parameters of electrospun nanofibers, the precursor nanofibers were subjected to TGA; the result is shown in Figure 2C. The weight losses were 10.82% (30-180 °C), 38.67% (180-400 °C), and 12.11% (400-800 °C) due to the rapid vaporization of the electrospinning solution, breakdown of the acetate ligand, and pyrolysis of the gel, respectively [30,31] . According to TGA, BNT-BST nanofibers can be produced by maintaining the electrospun nanofibers at 300 °C and 700 °C for 1 h. Figure 2D and E show the morphology and diameter distribution of BNT-BST nanofibers after sintering and crushing.…”

Enhanced High-Temperature Capacitive Energy Storage by 0.55Bi0.5Na0.5TiO3-0.45(Bi0.2Sr0.7)TiO3 Nanofibers in Polyetherimide Nanocomposites

“…The sintering parameters were determined by TGA analysis of the electrospinning film, and the result is displayed in Figure a. The mass of electrospinning films at 30–150, 150–390, and 390–800 °C decreased by 13.01, 39.96, and 13.91%, which were contributed by the rapid vaporization of the electrospun solution, decomposition of the acetic acid ligand, and pyrolysis of the gel, respectively. , Therefore, electrospinning films were sintered at 300 and 700 °C for 1 h to obtain BNT-BST nanofibers. Figure b shows the XRD patterns of electrospinning precursor nanofibers with different PVP contents after sintering.…”

“…This is mainly because BNT-BST nanofibers tend to be distributed along the in-plane during solution casting, and this arrangement makes BNT-BST nanofibers perpendicular to the electric field. When the vanguard of the breakdown phase encounters BNT-BST nanofibers, it usually chooses to penetrate nanofibers. ,, Therefore, the BNT-BST nanofibers block the propagation of electrical trees and suppress leakage current, and nanocomposites with an appropriate amount of BNT-BST nanofibers can withstand high breakdown fields . However, as the loading of BNT-BST nanofibers further increases, the introduction of defects increases, leading to local electric field distortion and a significant decrease in E b …”

“…21,22 In our previous work, the effects of electrospinning process parameters such as applied voltage, collector's rotation speed, and solution flow rate on the morphology of one-dimensional NBT nanofibers were systematically investigated. 23 However, it was found that the viscosity of the electrospinning solution also plays an important role in controlling the morphology of nanofibers. Therefore, reasonable selection of solutes and regulation of polymer molecular weight, solution concentration, and viscosity are beneficial for obtaining an appropriate range of solution viscosity and preparing nanofibers successfully.…”