Giant Energy Density and Improved Discharge Efficiency of Solution‐Processed Polymer Nanocomposites for Dielectric Energy Storage

Zhang, Xin; Shen, Yang; Xu, Bo; Zhang, Qinghua; Gu, Lin; Jiang, Jianyong; Ma, Jing; Lin, Yuanhua; Chen, Nan

doi:10.1002/adma.201503881

Cited by 556 publications

(336 citation statements)

References 29 publications

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“…For example a discharge energy density of 20 J cm −3 at 646 kV mm −1 was reported for BaTiO 3 @TiO 2 core–shell fibers in a polyvinylidene fluoride polymer matrix (denoted as BaTiO 3 @TiO 2 /PVDF, where @ denotes a core–shell structure) 8. This was subsequently improved to 31.2 J cm −3 at 797.7 kV mm −1 for nanocomposites with large aspect ratio fibers as a result of their preferred orientation directions perpendicular to the external electric field 9. However, these nanocomposites still possess relatively low energy density at a lower electric field, e.g., an energy density of ≈2.8 J cm −3 at the electric field of 250 kV mm −1 .…”

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confidence: 89%

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

et al. 2017

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Polymer‐based capacitors with high energy density have attracted significant attention in recent years due to their wide range of potential applications in electronic devices. However, the obtained high energy density is predominantly dependent on high applied electric field, e.g., 400–600 kV mm−1, which may bring more challenges relating to the failure probability. Here, a simple two‐step method for synthesizing titanium dioxide/lead zirconate titanate nanowire arrays is exploited and a demonstration of their ability to achieve high discharge energy density capacitors for low operating voltage applications is provided. A high discharge energy density of 6.9 J cm−3 is achieved at low electric fields, i.e., 143 kV mm−1, which is attributed to the high relative permittivity of 218.9 at 1 kHz and high polarization of 23.35 µC cm−2 at this electric field. The discharge energy density obtained in this work is the highest known for a ceramic/polymer nanocomposite at such a low electric field. The novel nanowire arrays used in this work are applicable to a wide range of fields, such as energy harvesting, energy storage, and photocatalysis.

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confidence: 89%

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

et al. 2017

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“…This unique energy storage mechanism leads to the intrinsic fast charging-discharging process and high power density. However, it also causes a relatively low energy density (~2 J cm −3 ) in comparison with fuel cells or Li-ion batteries (>20 J cm −3 ) 6,7 . Therefore, developing dielectric materials with improved energy densities is imperative to enable the reduction of size, weight, and cost of cutting-edge electrical power systems.…”

Section: Introductionmentioning

confidence: 99%

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

et al. 2018

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Developing high-performance film dielectrics for capacitive energy storage has been a great challenge for modern electrical devices. Despite good results obtained in lead titanate-based dielectrics, lead-free alternatives are strongly desirable due to environmental concerns. Here we demonstrate that giant energy densities of ~70 J cm−3, together with high efficiency as well as excellent cycling and thermal stability, can be achieved in lead-free bismuth ferrite-strontium titanate solid-solution films through domain engineering. It is revealed that the incorporation of strontium titanate transforms the ferroelectric micro-domains of bismuth ferrite into highly-dynamic polar nano-regions, resulting in a ferroelectric to relaxor-ferroelectric transition with concurrently improved energy density and efficiency. Additionally, the introduction of strontium titanate greatly improves the electrical insulation and breakdown strength of the films by suppressing the formation of oxygen vacancies. This work opens up a feasible and propagable route, i.e., domain engineering, to systematically develop new lead-free dielectrics for energy storage.

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“…However, the dielectric permittivities of polymer dielectrics are usually very low (below 10 @1 kHz), which greatly hindered their wide applications. Toward this end, two strategies have been developed to improve the dielectric constants of polymer composites: (1) ceramic-polymer composites composed of high-k ceramic fillers (e.g., BaTiO 3 [23][24][25][26][27], TiO 2 [28,29], SrTiO 3 [30]) dispersed in polymer matrix and (2) conductor-polymer composites consisting of conductors (e.g., metals, [31,32], graphite [33,34], carbon nanotube [35][36][37], graphene [38,39], carbon black [40], and conductive polymer [41,42]) dispersed in polymer matrix. For ceramic-polymer composites, the enhancement of permittivity is limited (below 50 @10 kHz) even when the ceramic loading excesses 50 vol%, leading to deteriorated mechanical properties, high loss, and low breakdown strength [43].…”

Section: Introductionmentioning

confidence: 99%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

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The search for high-performance dielectric materials has long been driven by the urgent needs for various modern electronics. However, enhanced permittivity is always accompanied by elevated loss, which seriously hinders the development and applications of dielectric materials. Herein, negative-k layers were introduced into layer-structured films, forming a new class of multilayer composites consisting of alternately stacked positive-k and negative-k layers. Compared with traditional multilayer composites without negative-k layers, the layered composites containing extra positive-k/negative-k interfaces exhibit superior ability in balancing the contradict parameters: permittivity and loss, yielding substantially enhanced permittivity without sacrificing the low loss. It is indicated that the permittivity was enhanced by the charge accumulations and reinforced polarizations on the interfaces between positive-k and negative-k layers. Meanwhile, the loss induced by the leakage current was suppressed by the blocked transport of carriers between adjacent layers. The trilayered 60-3.5-60 composite exhibits an enhanced dielectric constant (ε′ ≈ 33 @10 kHz) and retained low loss (tanδ ≈ 0.12 @10 kHz) compared with the single-layer BT/PVA composite containing 60 wt% BT fillers (ε′ ≈ 9.5 @10 kHz, tanδ ≈ 0.075 @10 kHz). This research offers an effective way to design and fabricate novel high-performance dielectric materials.

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Giant Energy Density and Improved Discharge Efficiency of Solution‐Processed Polymer Nanocomposites for Dielectric Energy Storage

Cited by 556 publications

References 29 publications

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

High Discharge Energy Density at Low Electric Field Using an Aligned Titanium Dioxide/Lead Zirconate Titanate Nanowire Array

Giant energy density and high efficiency achieved in bismuth ferrite-based film capacitors via domain engineering

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

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