Dielectric properties and discharged energy density of poly(vinylidene fluoride) composites with dopamine-modified PMN-P
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Dielectric properties and discharged energy density of poly(vinylidene fluoride) composites with dopamine‑modified PMN‑PT particles Jianan Li1 · Guanliang Chen1 · Xiujuan Lin1 · Shifeng Huang1 · Xin Cheng1 Received: 24 May 2020 / Accepted: 6 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Dielectric composites have been witnessed a surge of interest in the past few years for its potential application in energy storage due to their excellent dielectric properties and superior breakdown strength. In this work, PMN-PT particles were modified by dopamine and were used to prepare PMN-PT@Dopa /polyvinylidene fluoride (PVDF) composites. The maximum dielectric constant (εr) of composites with PMN-PT particles was 19.25 (1 kHz). The dielectric loss (tanδ) of composites with different volume fraction of PMN-PT was all below 0.03. The discharged energy density (Udis) of composites with 3 vol% PMN-PT@Dopa particles reached 11.07 J/cm3 at 370 kV/mm. The energy efficiency (η) of composites remained 40% at 350 kV/mm. The composite with PMN-PT@Dopa particles exhibited good fatigue endurance after 1 06 cycles. The results demonstrated that composites with PMN-PT particles possessed potential application in dielectric property and energy storage.
1 Introduction The past few years have witnessed a surge of interest in the development of dielectric materials with large discharged energy densities due to their extensive application in energy field, such as, energy harvesting, medical electronics and electronic weapon system [1–5]. Normally, Udis of linear dielectric materials is calculated by the equation: U = 1/2ε0εrEb2, where ε0 and εr are the vacuum dielectric constant and relative dielectric constant. Eb is the breakdown strength. It is clearly that the Udis of the dielectric material is closely related to εrand Eb according to the equation. Eb is an important element because Eb has a quadratic dependence on U [6, 7]. Thus the enhancement of εr and Eb is an available way to obtain high energy densities for dielectric materials. In this regard, composites composed of inorganic ceramic fillers and polymers have spurred enormous interest and urgent need owing to the prominent properties of high εr from inorganic ceramics and large Eb, ease of processing * Xiujuan Lin [email protected] * Shifeng Huang [email protected] 1
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, People’s Republic of China
and good flexibility from polymers. In general, ferroelectric ceramic fillers, such as BaTiO3 (BT) [8–10], Pb(Zr,Ti)O3 (PZT) [11, 12], BaxSr1–xTiO3 (BST) [13, 14], CaCu3Ti4O12 (CCTO) [15, 16] have often been used as fillers in composites attributed to their high dielectric constants. As for polymers, poly(vinylidene Fluoride) and copolymers are widely used because of the relative high εr and large Eb [17–19]. As a typical relax or ferroelectric ceramic, Pb(Mg1/3Nb2/3) O3–PbTiO3 (PMN–PT) has aroused wide conce
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