scholarly journals Significantly Enhanced Energy Storage Density by Modulating the Aspect Ratio of BaTiO3 Nanofibers

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Dou Zhang ◽  
Xuefan Zhou ◽  
James Roscow ◽  
Kechao Zhou ◽  
Lu Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Aspect Ratio ◽  
Volume Fraction ◽  
Breakdown Strength ◽  
Electric Displacement ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
Storage Density

Abstract There is a growing need for high energy density capacitors in modern electric power supplies. The creation of nanocomposite systems based on one-dimensional nanofibers has shown great potential in achieving a high energy density since they can optimize the energy density by exploiting both the high permittivity of ceramic fillers and the high breakdown strength of the polymer matrix. In this paper, BaTiO3 nanofibers (NFs) with different aspect ratio were synthesized by a two-step hydrothermal method and the permittivity and energy storage of the P(VDF-HFP) nanocomposites were investigated. It is found that as the BaTiO3 NF aspect ratio and volume fraction increased the permittivity and maximum electric displacement of the nanocomposites increased, while the breakdown strength decreased. The nanocomposites with the highest aspect ratio BaTiO3 NFs exhibited the highest energy storage density at the same electric field. However, the nanocomposites with the lowest aspect ratio BaTiO3 NFs achieved the maximal energy storage density of 15.48 J/cm3 due to its higher breakdown strength. This contribution provides a potential route to prepare and tailor the properties of high energy density capacitor nanocomposites.

scholarly journals Enhanced energy density of PVDF-based nanocomposites via a core–shell strategy

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
JingJing Xu ◽  
Chao Fu ◽  
Huiying Chu ◽  
Xianyou Wu ◽  
Zhongyang Tan ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Vinylidene Fluoride ◽  
Breakdown Strength ◽  
Electric Displacement ◽  
High Energy ◽  
High Energy Density ◽  
Core Shell ◽  
Discharge Energy ◽  
Discharge Energy Density

Abstract In recent years, high energy density polymer capacitors have attracted a lot of scientific interest due to their potential applications in advanced power systems and electronic devices. Here, core–shell structured TiO2@SrTiO3@polydamine nanowires (TiO2@SrTiO3@PDA NWs) were synthesized via a combination of surface conversion reaction and in-situ polymerization method, and then incorporated into the poly(vinylidene fluoride) (PVDF) matrix. Our results showed that a small amount of TiO2@SrTiO3@PDA NWs can simultaneously enhance the breakdown strength and electric displacement of nanocomposite (NC) films, resulting in improved energy storage capability. The 5 wt% TiO2@SrTiO3@PDA NWs/PVDF NC demonstrates 1.72 times higher maximum discharge energy density compared to pristine PVDF (10.34 J/cm3 at 198 MV/m vs. 6.01 J/cm3 at 170 MV/m). In addition, the NC with 5 wt% TiO2@SrTiO3@PDA NWs also demonstrates an excellent charge–discharge efficiency (69% at 198 MV/m). Enhanced energy storage performance is due to hierarchical interfacial polarization among their multiple interfaces, the large aspect ratio as well as surface modification of the TiO2@SrTiO3 NWs. The results of this study provide guidelines and a foundation for the preparation of the polymer NCs with an outstanding discharge energy density.

scholarly journals Enhanced energy storage density of all-organic fluoropolymer composite dielectric via introducing crosslinked structure

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15177-15183
Author(s):  
Xiongjie Li ◽  
Ying Yang ◽  
Yiping Wang ◽  
Shuting Pang ◽  
Jingjing Shi ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
Storage Density ◽  
Organic Composites

High energy density is achieved for all-organic composites by introducing crosslinked structure.

scholarly journals High Breakdown Strength and Energy Storage Density in Aligned SrTiO3@SiO2 Core–Shell Platelets Incorporated Polymer Composites

Membranes ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 756
Author(s):  
Jie Chen ◽  
Xiaoyong Zhang ◽  
Xiao Yang ◽  
Chuanyang Li ◽  
Yifei Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Electric Field ◽  
Breakdown Strength ◽  
Electric Displacement ◽  
High Energy ◽  
Energy Storage Density ◽  
Capacitive Energy Storage ◽  
Storage Density ◽  
Field Distortion ◽  
High Dielectric

Dielectric nanocomposites with high energy storage density (Ue) have a strong attraction to high-pulse film energy-storage capacitors. Nevertheless, low breakdown strengths (Eb) and electric displacement difference (Dmax − Drem) values of nanocomposites with incorporating the randomly distributed high dielectric constant additions, give rise to low Ue, thereby hindering the development of energy-storage capacitors. In this study, we report on newly designed SrTiO3@SiO2 platelets/PVDF textured composites with excellent capacitive energy storage performance. SrTiO3@SiO2 platelets are well oriented in the PVDF when perpendicular to the electric field with the assistance of shear force in the flow drawing process to establish microscopic barriers in an inorganic–polymer composite that is able to substantially improve the Eb of composites and enhance the Ue accordingly. Finite element simulation demonstrates that the introduction of the highly insulating SiO2 coating onto the SrTiO3 platelets effectively alleviates the interface dielectric mismatch between filler and PVDF matrix, resulting in a reduction in the interface electric field distortion. The obtained composite film with optimized paraelectric SrTiO3@SiO2 platelets (1 vol%) exhibited a maximum Dmax − Drem value of 9.14 μC cm−2 and a maximum Ue value of 14.4 J cm−3 at enhanced Eb of 402 MV m−1, which are significantly superior to neat PVDF and existing dielectric nanocomposites.

scholarly journals Composite of Aromatic Polythiourea/BaTiO3 Nanowires with High Energy Density and High Discharge Efficiency for Energy Storage Applications

2021 ◽  
Author(s):  
Li Xiali ◽  
Liuwei Shi ◽  
Lei Chen ◽  
Wenyao Yang ◽  
Xiaoting Zha ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
High Discharge ◽  
Storage Density ◽  
Discharge Efficiency ◽  
High Energy Storage Density ◽  
High Energy Storage

Abstract Ceramic/polymer nanocomposites have shown great potential in high energy storage density capacitors for pulsed power applications. However, due to the difference in surface energy between inorganic fillers and polymers, the discharge energy density and efficiency of nanocomposites are limited. In this article, the BaTiO3 (BT) nanowires (nws) modified with dopamine (Dopa) was introduced into aromatic polythiourea (ArPTU) polymer matrix as composite for high performance dielectrics. This is a new path about the introduction of a high dielectric constant ceramic into high dipole moment linear polymers (HDMLP), which produces the polymer composite with high energy storage density and high discharge efficiency. The composite ArPTU/BT nws shows an energy density of 7.5 Jžcm-3 and high efficiency more than 90 % is obtained under an electric field of 250 MVžm-1. It also has been found that the modification of BT nws with the dopamine reduces the dielectric loss of composite effectively due to the good synergistic effective between ArPTU and BT nws, and high stability of composite for energy storage is also achieved. This work provides an effective solution for achieving high energy storage density and high discharge efficiency in polymer dielectrics for practical capacitor applications.

Characterization of Nanocomposites Incorporating PZT Nanowires for Enhanced Energy Storage

2010 ◽  
Author(s):  
Haixiong Tang ◽  
Yirong Lin ◽  
Clark Andrews ◽  
Henry A. Sodano
Keyword(s):  
Energy Storage ◽  
Dielectric Properties ◽  
Energy Density ◽  
Aspect Ratio ◽  
Electric Field ◽  
Polymer Composites ◽  
Volume Fraction ◽  
High Energy ◽  
High Energy Density ◽  
High Dielectric

0–3 Piezoceramic polymer composites have attracted immense attention due to the flexibility afforded by the polymer matrix and the strong electromechanical coupling and high dielectric properties of the piezoceramic filler. The majority of research on these materials has focused on the effective piezoelectric properties of the piezoceramic polymer composites. However, the high dielectric strength of the polymer combined with the high permittivity of the ceramic filler make them well suited for use as high energy density capacitors and various pulsed power applications. Current work in this area has focused on the enhancement of the dielectric properties through a variation of nanoparticle composition or surface modifications to the fillers to enhance the energy density of composites. Recently, research and micromechanics modeling have shown that the filler aspect ratio plays an important role in increasing the effective dielectric properties of the composites. Therefore, unlike prior efforts, this work will focus on the effect of filler aspect ratio on the dielectric properties of the bulk nanocomposite. Nanocomposites were synthesized using lead zirconate titanate (PZT) with two different aspect ratio (nanowires, nanorods) fillers at various volume fractions dispersed in a polyvinylidene fluoride (PVDF) matrix. It was shown that the nanocomposites containing PZT nanowires (NWs) significantly increased the energy density compared to those containing lower aspect ratio PZT nanorods (NRs). The permittivity constants of composites containing PZT NWs were higher than those with PZT NRs at the same inclusion volume fraction. The experimental results also indicated that the high frequency loss tangent of nanocomposites with PZT NWs was smaller than those of PZT NRs, demonstrating the high electrical energy storage efficiency of the PZT NW composite. The PZT NW nanocomposites showed a 77.8% increase in energy density over the PZT NR nanocomposites, under an electric field of 15 kV/mm and 50% volume fraction. Because the energy density exhibits a quadratic relationship with the applied electric field, the performance enhancement through the use of NWs is even greater at higher electric fields. These results indicate that higher aspect ratio PZT nanowires shows promising potential to improve the energy density of nanocomposites, leading the development of advanced capacitors with high energy density.

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

2018 ◽  
Vol 08 (06) ◽  
pp. 1850040 ◽  
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.

Effect of Gd2O3/BaF2 Addition on Dielectric Behavior and Energy Storage Properties of Strontium Barium Niobate Glass-Ceramics

2014 ◽  
Vol 633 ◽  
pp. 422-426
Author(s):  
Jun Song ◽  
Guo Hua Chen ◽  
Yu Tang
Keyword(s):  
Energy Storage ◽  
Breakdown Strength ◽  
Glass Ceramics ◽  
Phase Evolution ◽  
High Energy ◽  
Dielectric Behavior ◽  
Energy Storage Density ◽  
Storage Density ◽  
Energy Storage Properties ◽  
Storage Properties

SrO–BaO–Nb2O5–B2O3system glass-ceramics with Gd2O3/BaF2addition have been prepared by controlled crystallization method. The effect of Gd2O3/BaF2addition on the phase evolution, dielectric properties and energy storage properties has been investigated. The addition of Gd2O3/BaF2to the glass-ceramics changes the dielectric property and energy storage density. The glass-ceramics with 0.5 mol% Gd2O3and 4.5mol% BaF2heat treated at 850°C/3h possesses a dielectric constant of 125, a breakdown strength of 1055 kV/mm and energy storage density of 6.16J/cm3, which are promising materials for high energy storage density dielectrics.

scholarly journals Low-Cost High Energy Density Material for Solar Thermal Heat Storage

2020 ◽  
Vol 3 (2) ◽  
pp. 46-56
Author(s):  
Rebhi Damseh
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Energy Density ◽  
Heat Storage ◽  
Low Cost ◽  
High Energy ◽  
Solar Thermal ◽  
Energy Storage Density ◽  
Solar Thermal Energy ◽  
Storage Density

A low-cost and enhanced thermal properties composite material for sensible heat storage in solar thermal energy storage applications is introduced. The proposed material is produced primarily for small scale solar thermal applications. However, it can be utilized for large scale solar thermal plants. The material has the advantages of high thermal conductivity and large energy storage density. The introduced material is composed of a mixture of cement and cast-iron particles. To obtain an optimal mixture, different samples of the material are prepared with different ratios of the cement-iron weights. The thermal conductivity of the produced samples is measured by using the linear heat conduction method. The specific heat capacity of the produced mixtures is calculated by using the Rule of the mixture. The obtained results show that the introduced material has a significant enhancement in thermal conductivity. Where, thermal conductivity as high as ~6.0 W/m.K and energy storage density as high as ~788 Joule/cm3 are achieved. The estimated volume energy density is ~89% higher than that of water. The produced material has the advantage of high energy volume density, being unhazardous, chemically stable, eco-friendly, easy to fabricate, and integrate with solar thermal energy systems and is a low-cost material.

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