Dielectric and Energy Storage Property of Dielectric Nanocomposites with BaTiO3 Nanofibers

doi:10.15541/jim20180041

Abstract

Abstract:

In this study, BaTiO₃ nanofibers were synthesized by a two-step hydrothermal method and subsequently incorporated into poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix to prepare nanocomposites for energy storage application. The crystalline phase, morphology and microstructure of BaTiO₃ nanofibers were observed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy, respectively. The dielectric properties and energy storage performance of the nanocomposites were characterized by dielectric and ferroelectric analyzer. The BaTiO₃ nanofibers with tetragonal phase structure exhibited high aspect ratios, good dispersibility and compatibility in polymer matrix. The effects of volume fraction of BaTiO₃ nanofibers on the dielectric constant, breakdown strength and discharged energy density of the nanocomposites were investigated systematically. The dielectric constant of the BaTiO₃-P(VDF-HFP) nanocomposites remarkably improved with the increase of BaTiO₃ nanofiber contents at the same frequency. At 1 kHz, the maximum dielectric constant of the composite with 20vol% BaTiO₃ nanofibers is up to 30.69. The composite with 5vol% BaTiO₃ nanofibers achieves the maximum energy storage density (4.89 J/cm³) and discharged energy density (2.58 J/cm³) at 240 kV/mm.

Key words: BaTiO₃, dielectric nanocomposite, dielectric constant, energy density

CLC Number:

TB34

WANG Lu, KONG Wen-Jie, LUO Hang, ZHOU Xue-Fan, ZHOU Ke-Chao, ZHANG Dou. Dielectric and Energy Storage Property of Dielectric Nanocomposites with BaTiO₃ Nanofibers[J]. Journal of Inorganic Materials, 2018, 33(10): 1059-1064.

Figures/Tables 6

Fig. 1 (a) SEM image of BaTiO3 nanofibers; (b) XRD patterns of Na2Ti3O7 and BaTiO3 nanofibers; (c) TEM image, (d) HRTEM and FFT image of BaTiO3 nanofibers

Fig. 2 Surface SEM images of (a) pure P(VDF-HFP) and composites filled with various BaTiO3 nanofibers: (b) 5vol%; (c) 10vol%; (d) 20vol%

Fig. 3 (a) Dielectric constant of BaTiO3-P (VDF-HFP) and (b) dielectric loss of BaTiO3-P (VDF-HFP) composites as a function of frequency

Fig. 4 Breakdown strength of BaTiO3-P(VDF-HFP) composite and pure P(VDF-HFP)

Table 1 Weibull distribution of the dielectric breakdown strength of composites filled with various BaTiO3 nanofibers

Contents of BaTiO₃ nanofibers	β	E₀/(kV∙mm^-1)
0	8.24	397
5vol%	6.16	244
10vol%	5.46	198
20vol%	2.51	72

Fig. 5 Displacement hysteresis loops of composites filled with various BaTiO3 nanofibers(a) 5vol%, (b) 10vol%, (c) 20vol% and (d) energy density of composites

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Dielectric and Energy Storage Property of Dielectric Nanocomposites with BaTiO₃ Nanofibers

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