Significantly Enhanced Energy Storage Density by Modulating the Aspect Ratio of BaTiO3 Nanofibers

Abstract

There is a growing need for high energy density capacitors in modern electric power supplies. The creation of nanocomposite systems based on one-dimensional nanofibers has shown great potential in achieving a high energy density since they can optimize the energy density by exploiting both the high permittivity of ceramic fillers and the high breakdown strength of the polymer matrix. In this paper, BaTiO3 nanofibers (NFs) with different aspect ratio were synthesized by a two-step hydrothermal method and the permittivity and energy storage of the P(VDF-HFP) nanocomposites were investigated. It is found that as the BaTiO3 NF aspect ratio and volume fraction increased the permittivity and maximum electric displacement of the nanocomposites increased, while the breakdown strength decreased. The nanocomposites with the highest aspect ratio BaTiO3 NFs exhibited the highest energy storage density at the same electric field. However, the nanocomposites with the lowest aspect ratio BaTiO3 NFs achieved the maximal energy storage density of 15.48 J/cm3 due to its higher breakdown strength. This contribution provides a potential route to prepare and tailor the properties of high energy density capacitor nanocomposites.

High Energy Density Dielectrics Based on PVDF‐Based Polymers

“…Figure a shows the finite element calculation results of the distribution of the electric field for the region near a BaTiO 3 fiber in a P(VDF‐HFP)/BaTiO 3 fiber (2.5 vol. %) matrix . The aspect ratio of the fibers is 3.5 and the fibers are orientated at 30° to the applied field.…”

“…c) Effect of aspect ratio of BaTiO 3 fibers on the energy density of the composites. d) Effect of volume fraction of BaTiO 3 fibers on the energy density of the composites . Reproduced with permission.…”

“…On the other hand, a larger aspect ratio can more significantly enhance dielectric properties. Consequently, a higher energy density can be achieved when a similar electric field is applied to the composites containing fibers with a higher aspect ratio …”

Hydrothermal synthesis of pseudocubic BaTiO3 nanoparticles using TiO2 nanofibers: Study on photocatalytic and dielectric properties

“…In contrast, using planar Ti‐film as the Ti source hinders complete transformation and limits BTO formation to the vicinity of the film surface. Using a very similar approach, BTO samples with fiber morphology were obtained from K 2 Ti 6 O 13 and Na 2 Ti 3 O 7 fibers, under hydrothermal conditions . In a very recent study, Nageri and Kumar used anodized TiO 2 nanotube arrays as a template to prepare well‐ordered, vertically aligned BTO nanotube arrays by the hydrothermal method for visible light photocatalytic degradation of MB .…”

High energy storage performance for dielectric film capacitors by designing 1D SrTiO3@SiO2 nanofillers

“…[18][19][20][21][22][23][24] Of particular, previous research has confirmed that high aspect ratio onedimensional (1D) ceramic nanofillers, such as barium titanate (BT) and lead zirconate titanate (PZT) nanowires, can efficiently enhance the dielectric constant and energy density of polymer nanocomposites when compared to their corresponding spherical particles. [25][26][27][28][29][30][31] This is due to the fact that the ferroelectric ceramic nanowires possess larger dipolar moment, which could enhance D max of these nanocomposites at a lower volume fraction, also benefiting the E b . 32 However, the large P r of the ferroelectric ceramic fillers was employed, leading to more electric energy being stored in the form of P r , thus the polymer nanocomposites filled with traditional ferroelectric fillers (e.g., BT and PZT) cannot be extracted a high energy density during the discharging process.…”