(Ba,Sr)TiO3–Bi(Mg,Hf)O3 Lead-Free Ceramic Capacitors with High Energy Density and Energy Efficiency

A new lead-free antiferroelectric ceramic NBT–SBT was introduced into PVDF polymer to fabricate composites films, achieving record-high energy density of 15.3 J cm−3 at 500 MV m−1 and meeting the requirement of miniaturization and lightweight device.

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Strategies to Improve the Energy Storage Properties of Perovskite Lead-Free Relaxor Ferroelectrics: A Review

Materials ◽

10.3390/ma13245742 ◽

2020 ◽

Vol 13 (24) ◽

pp. 5742

Author(s):

Vignaswaran Veerapandiyan ◽

Federica Benes ◽

Theresa Gindel ◽

Marco Deluca

Keyword(s):

Energy Storage ◽

Energy Density ◽

Electrical Energy ◽

High Energy ◽

Relaxor Ferroelectrics ◽

High Energy Density ◽

Lead Free ◽

Chemical Additives ◽

Energy Storage Properties ◽

Novel Processing

Electrical energy storage systems (EESSs) with high energy density and power density are essential for the effective miniaturization of future electronic devices. Among different EESSs available in the market, dielectric capacitors relying on swift electronic and ionic polarization-based mechanisms to store and deliver energy already demonstrate high power densities. However, different intrinsic and extrinsic contributions to energy dissipations prevent ceramic-based dielectric capacitors from reaching high recoverable energy density levels. Interestingly, relaxor ferroelectric-based dielectric capacitors, because of their low remnant polarization, show relatively high energy density and thus display great potential for applications requiring high energy density properties. In this study, some of the main strategies to improve the energy density properties of perovskite lead-free relaxor systems are reviewed, including (i) chemical modification at different crystallographic sites, (ii) chemical additives that do not target lattice sites, and (iii) novel processing approaches dedicated to bulk ceramics, thick and thin films, respectively. Recent advancements are summarized concerning the search for relaxor materials with superior energy density properties and the appropriate choice of both composition and processing routes to match various applications’ needs. Finally, future trends in computationally-aided materials design are presented.

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Improved dielectric constant and energy density of P(VDF-HFP) composites using NBT-xST (x=0, 0.10, 0.26) whiskers

Journal of Advanced Dielectrics ◽

10.1142/s2010135x18500406 ◽

2018 ◽

Vol 08 (06) ◽

pp. 1850040 ◽

Cited By ~ 1

Author(s):

Xuefan Zhou ◽

Lu Wang ◽

Guoliang Xue ◽

Kechao Zhou ◽

Hang Luo ◽

...

Keyword(s):

Energy Efficiency ◽

Dielectric Constant ◽

Energy Storage ◽

Energy Density ◽

Electric Field ◽

High Performance ◽

Volume Fraction ◽

High Energy ◽

High Energy Density ◽

Surface Modified

The high-performance energy-storage dielectric capacitors are increasingly important due to their wide applications in high power electronics. Here, we fabricated a novel P(VDF-HFP)-based capacitor with surface-modified NBT-[Formula: see text]ST ([Formula: see text], 0.10, 0.26) whiskers, denoted as Dop@NBT-[Formula: see text]ST/P(VDF-HFP). The influences of ST content, fillers’ volume fraction and electric field on the dielectric properties and energy-storage performance of the composites were investigated systematically. The results show that the dielectric constant monotonously increased with the increase of ST content and fillers’ volume fraction. The composite containing 10.0 vol% NBT-0.26ST whiskers possessed a dielectric constant of 39 at 1[Formula: see text]kHz, which was 5.6 times higher than that of pure P(VDF-HFP). It was noticed that the D-E loops of the composites became thinner and thinner with the increase of ST content. Due to the reduced remnant polarization, the composite with 5.0 vol% NBT-0.26ST whiskers achieved a high energy density of 6.18[Formula: see text]J/cm3 and energy efficiency of approximately 57% at a relatively low electric field of 200[Formula: see text]kV/mm. This work indicated that NBT-0.26ST whisker is a kind of potential ceramic filler in fabricating the dielectric capacitor with high discharged energy density and energy efficiency.

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