Core@Double-Shell Structured BaTiO₃–Polymer Nanocomposites with High Dielectric Constant and Low Dielectric Loss for Energy Storage Application

Abstract

Polymer nanocomposites with high dielectric constant have extensive applications in the electronic and electrical industry because of ease of processing and low cost. Blending and in situ polymerization are two conventional methods for the preparation of polymer nanocomposites. However, the resulting nanocomposites, particularly highly filled nanocomposites, generally have some disadvantages such as high dielectric loss and low dielectric constant and thus show low energy density and low energy efficiency. Here we developed a core@double-shell strategy to prepare barium titanate (BT)-based high performance polymer nanocomposites, in which the first shell is hyperbranched aromatic polyamide (HBP) and the second shell is poly(methyl methacrylate) (PMMA). This method utilized the advantages of both polymer shells, resulting in superior dielectric property which cannot be achieved in nanocomposites prepared by the conventional blending methods. It is found that, compared with the conventional solution blended BT/PMMA nanocomposites, the core@double-shell structured BT@HBP@PMMA nanocomposites had higher dielectric constant and lower dielectric loss. The energy densities of BT@HBP@PMMA nanocomposites were higher than that of BT/PMMA nanocomposites accordingly. The dielectric response of the nanocomposites was analyzed, and the mechanisms resulting in the higher dielectric constant and lower dielectric loss in BT@HBP@PMMA nanocomposites were proposed. This study suggests that the core@double-shell strategy shows strong potential for preparing polymer nanocomposites with desirable dielectric properties.

Ultrahigh Energy Density of Polymer Nanocomposites Containing BaTiO3@TiO2 Nanofibers by Atomic‐Scale Interface Engineering

“…[ 19,20 ] The highest E B thus determined is ≈646 kV mm -1 at 3 vol% of BTO@TO_nfs, which is higher than that of pure PVDF (≈599 kV mm -1 ) and is even comparable to E B of BOPP (≈650 kV mm -1 ). Plus, the corresponding β value is 22.5, as compared with β = 18.7 for pure PVDF.…”

Enhanced thermal conductivity and dielectric properties of Al/β-SiCw/PVDF composites

“…As a kind of passive components, the embedded capacitors are of great importance for a range of applications in modern electronic systems such as kinetic weapons, electromagnetic armor, and high power microwaves, etc [1][2][3][4][5][6]. Compared with other energy storage devices, embedded capacitors possess high power density and attract special attentions due to the variety of functions including fast charge storage and discharge [7], decoupling, and by-passing as well as their capability to enhance the electrical performance and to reduce the size and cost of an electronic system [8][9].…”

“…Compared with other energy storage devices, embedded capacitors possess high power density and attract special attentions due to the variety of functions including fast charge storage and discharge [7], decoupling, and by-passing as well as their capability to enhance the electrical performance and to reduce the size and cost of an electronic system [8][9]. In an effort to further enhance the energy storage property of embedded capacitors, some critical properties of dielectric materials including high dielectric permittivity but low dielectric loss, flexibility are eagerly desired [6]. However, the traditional dielectric materials, such as organic polymer and inorganic ceramics, fail to meet the rigorous requirements of advanced capacitors.…”

The influence of crystalline transformation of Ba0.6Sr0.4TiO3 nanofibers/poly(vinylidene fluoride) composites on the energy storage properties by quenched technique

“…One simple method to increase the dielectric constant of a polymer focuses on dispersing perovskite ceramic particles (such as BaTiO 3 Ba x Sr 1 À x TiO 3 , Pb(Zr,Ti)O 3 ) with high dielectric constant into the polymer matrix [14,15]. However, higher loading of the spherical ceramic fillers is usually needed in order to realize high dielectric constant according to a Maxwell-Garnett model rule of mixtures [16].…”