Research Progress of Polymer-based Multilayer Composite Dielectrics with High Energy Storage Density

doi:10.15541/jim20220343

Abstract

Abstract:

Film capacitors are the core electronic components of modern power devices and electronic equipment. However, due to the low dielectric constant, it is difficult to obtain high energy storage density (effective energy storage density or discharged energy density) for present film capacitors, leading to a large device size and high application cost. To improve the energy storage density of film capacitors, a nanocomposite approach is an effective strategy via combining high dielectric constant of the ceramic nanoparticles with high breakdown strength of the polymer matrix. Nevertheless, for single-layer structure of 0-3 polymer/ceramic composites, the dielectric constant and breakdown strength are difficult to be effectively enhanced at the same time, which limits the further improvement of energy storage density. To solve this contradiction, researchers have combined the composite film with high dielectric constant and high breakdown strength in a superposition to prepare 2-2 type multilayer composite dielectrics, which can achieve synergistic regulation of polarization strength and breakdown strength to obtain high energy storage density. The optimization of electric field distribution and the synergistic regulation of dielectric constant and breakdown strength can be achieved through mesoscopic and microstructural modulation of multilayer composite dielectrics. In this paper, the research progress of multilayer polymer-based composite dielectrics including ceramic/polymer multilayer structure and all-organic polymer multilayer structure in recent years is reviewed. Effect of multi-layer structure control strategy on the improvement of energy storage performance is emphasized. Moreover, enhancement mechanism of energy storage performance of polymer-based multilayer structure composite dielectric is summarized. Finally, challenges and development directions of multilayer composite dielectrics are discussed.

Key words: film capacitor, multilayer polymer-based composite dielectric, dielectric constant, breakdown strength, energy storage density, review

CLC Number:

TQ174

XIE Bing, CAI Jinxia, WANG Tongtong, LIU Zhiyong, JIANG Shenglin, ZHANG Haibo. Research Progress of Polymer-based Multilayer Composite Dielectrics with High Energy Storage Density[J]. Journal of Inorganic Materials, 2023, 38(2): 137-147.

Figures/Tables 7

Fig. 1 PVDF-based composites and sandwich-structured BT/PVDF composites[28] (a) Electric field distribution simulation diagram; (b) Breakdown field strength; (c) COMSOL multi-physics field simulation; (d, e) Energy density

Fig. 2 BT@HPC/PVDF composite[27] (a, b1) Schematic diagram of preparation and space charge polarization distribution of BT@HPC/PVDF composites; (b2) Microcapacitor networks constructed by BT@HPC; (b3) Generated space charge region (SCR) surrounding BT@HPC in the PVDF matrix; (b4) Space charge regions in single-layer structural composites; (b5) Three-layer structural composites; (c) Weibull breakdown distribution; (d) Discharged energy density Colorful figures are available on website

Fig. 3 Schematic preparation of all-organic PMMA/P(VDF-HFP) films, cross-sectional SEM image, discharged energy density, and charge-discharge efficiency[35] (a) Schematic illustration of PMMA/P(VDF-HFP) films; (b) SEM cross-sectional image; (c) Discharged energy density; (d) Charge-discharge efficiency

Fig. 4 Three-layer composite film with PVDF/BNNS as the outer layer and PVDF/BST as the middle layer[26] (a) Structure schematic; (b) Weibull plots for the trilayer-structured nanocomposites indicating the failure distribution; (c) The development of electrical trees in the trilayer-structured nanocomposites with different BST NW contents at 550 MV·m−1; (d) Weibull breakdown strength and maximum electrical displacement; (e) Discharged energy density

Fig. 5 Dielectric energy storage properties of multilayer composites with asymmetric LTN structure[45] (a) Dielectric energy storage properties of multilayer composites with asymmetric LTN structure; (b) Weibull breakdown distribution; (c) Derived breakdown strength; (d) Discharged energy density; (e) Charge-discharge efficiency (b, d, e) E/F in volume fraction

Fig. 6 Gradient-structured BaTiO3/PVDF nanocomposites (GLN)[46] (a) Electric field distribution and growth of breakdown channels; (b) Average electric field in each layer of GLNs; (c) Electric field gap at different interfaces and average electric field in the GLN sample; (d, e) Discharged energy density and charge-discharge efficiency

Fig. 7 P(VDF-HFP)/BT nanocomposites and P(VDF-HFP)-P(VDF-HFP)/BT multilayer nanocomposites[48] (a) Schematic illustration of the preparation; (b) SEM image of P(VDF-HFP)-10% BTO; (c, d) Polarization interface ions and induced depolarization and phase field simulation of multilayer nanocomposites; (e) Breakdown strength of multilayer composites and control group; (f) Discharged energy density of different types of composites

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