Graphene oxide-encapsulated carbon nanotube hybrids for high dielectric performance nanocomposites with enhanced energy storage density

Nanoscale ◽  
2013 ◽  
Vol 5 (9) ◽  
pp. 3847 ◽  
Author(s):  
Chao Wu ◽  
Xingyi Huang ◽  
Xinfeng Wu ◽  
Liyuan Xie ◽  
Ke Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanotube ◽  
Energy Storage ◽  
Energy Storage Density ◽  
Storage Density ◽  
Dielectric Performance ◽  
High Dielectric

Enhanced dielectric performance and energy storage density of polymer/graphene nanocomposites prepared by dual fabrication

2018 ◽  
Vol 33 (2) ◽  
pp. 270-285 ◽  
Author(s):  
UO Uyor ◽  
API Popoola ◽  
OM Popoola ◽  
VS Aigbodion
Keyword(s):  
Energy Storage ◽  
Polymer Matrix ◽  
Vinylidene Fluoride ◽  
Energy Storage Materials ◽  
Energy Storage Density ◽  
Melt Mixing ◽  
Graphene Nanocomposites ◽  
Storage Density ◽  
Solution Blending ◽  
Dielectric Performance

Polymer/graphene nanocomposites (PGNs) have shown great potential as dielectric and energy storage materials. However, insolubility of graphene in most solvents, hydrophobic behaviour and poor dispersion in polymer matrix restrict wider fabrications and applications of PGNs. In this study, we present co-fabricated PGNs engineered by solution blending and melt compounding methods with improved dielectric performance. Further processing of PGNs by melt mixing after solution blending not only improved dispersion of graphene in the matrix but also ensured good interfacial interaction of the composites’ constituents and reduction of oxygen content in PGNs. Graphene nanoplatelets used in this study was slightly functionalized (fGNPs) to enhance dispersion in the polymer matrix. It was later characterized using Fourier transform infrared (FTIR) and Raman spectrometer. Scanning electron microscope (SEM) was used in morphological study of the fabricated composites. Dielectric properties, electrical conductivity, breakdown strength and energy storage capacity of the fabricated composites were investigated. The results obtained showed well-dispersed fGNPs in poly (vinylidene fluoride) (PVDF) matrix and improved dielectric performance. For instance, with 3.34 wt% and 6.67 wt% fGNPs co-fabricated composites, dielectric constant increased from about 9 for neat PVDF to 9930 and 38,418 at 100 Hz, respectively. While 7588 and 12,046 were respectively measured for solution blended-only composites at similar fGNPs content. These resulted to about 176.9% and 376.4% increase in energy storage density with 3.34 wt% and 6.67 wt% fGNPs co-fabricated composites when compared to their counterparts. These results were also credited to strong bonding, reduction of oxygen and recovered graphene structure by melt-mixing approach.

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 Improved Energy Storage Performance of All-Organic Composite Dielectric via Constructing Sandwich Structure

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1972
Author(s):  
Mengjia Feng ◽  
Tiandong Zhang ◽  
Chunhui Song ◽  
Changhai Zhang ◽  
Yue Zhang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Sandwich Structure ◽  
Volume Ratio ◽  
High Energy ◽  
Energy Storage Density ◽  
Storage Efficiency ◽  
Storage Density ◽  
Energy Storage Efficiency ◽  
High Dielectric ◽  
High Energy Storage

Improving the energy storage density of dielectrics without sacrificing charge-discharge energy storage efficiency and reliability is crucial to the performance improvement of modern electrical and electronic systems, but traditional methods of doping high-dielectric ceramics cannot achieve high energy storage densities without sacrificing reliability and storage efficiency. Here, an all-organic energy storage dielectric composed of ferroelectric and linear polymer with a sandwich structure is proposed and successfully prepared by the electrostatic spinning method. Additionally, the effect of the ferroelectric/linear volume ratio on the dielectric properties, breakdown, and energy storage is systematically studied. The results show that the structure has good energy storage characteristics with a high energy storage density (9.7 J/cm3) and a high energy storage efficiency (78%). In addition, the energy storage density of the composite dielectric under high energy storage efficiency (90%) is effectively improved (25%). This result provides theoretical analysis and experience for the preparation of multilayer energy storage dielectrics which will promote the development and application of energy storage dielectrics.

Laminated structure-induced high dielectric strength and energy storage density in dielectric composites

2019 ◽  
Vol 173 ◽  
pp. 61-65 ◽  
Author(s):  
Ziming Cai ◽  
Xiaohui Wang ◽  
Bingcheng Luo ◽  
Peiyao Zhao ◽  
Chaoqiong Zhu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Dielectric Strength ◽  
Energy Storage Density ◽  
Laminated Structure ◽  
Storage Density ◽  
High Dielectric

Gd2O3 Added Glass-Ceramic Composite for the Improvement of Energy Storage Density through Controlled Crystallization

2010 ◽  
Vol 150-151 ◽  
pp. 80-83
Author(s):  
Yi Zhou ◽  
Qun Tang ◽  
Jun Luo ◽  
Qing Meng Zhang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Glass Ceramic ◽  
Breakdown Strength ◽  
Electric Energy ◽  
Ceramic Composites ◽  
Energy Storage Density ◽  
Storage Density ◽  
Electric Energy Storage ◽  
Dielectric Performance ◽  
Controlled Crystallization

Crystallization of a glass containing high dielectric performance components can be controlled in the nucleation and growth processes in order to meet the requirements of enabling the glass-ceramic dielectric composites to obtain the desired high electric energy storage densitiy. In this paper, the controlled crystallization technique was employed to synthesize glass-ceramic composites with addition of Gd2O3 in BaO-Na2O- Nb2O5- SiO2 glass system. The results show that both the dielectric constant and the breakdown strength of the glass-ceramic composites demonstrate an increasing tendency with the addition of Gd2O3 from 0 mol% to 7 mol% (relative to SiO2), being responsible for remarkable improvement of the energy storage density of the glass-ceramic composites from 1.7 J/cm3 to 4.7 J/cm3.

Greatly improving energy storage density and reducing dielectric loss of carbon nanotube/cyanate ester composites through building a unique tri-layered structure with mica paper

2017 ◽  
Vol 5 (41) ◽  
pp. 21909-21918 ◽  
Author(s):  
Xiaobao Zhang ◽  
Li Yuan ◽  
Qingbao Guan ◽  
Guozheng Liang ◽  
Aijuan Gu
Keyword(s):  
Carbon Nanotube ◽  
Energy Storage ◽  
Dielectric Loss ◽  
Layered Structure ◽  
High Energy ◽  
Cyanate Ester ◽  
Energy Storage Density ◽  
Storage Density ◽  
Low Dielectric ◽  
High Energy Storage Density

Carbon nanotube/cyanate ester–mica paper tri-layered structure composites with markedly high energy storage density and low dielectric loss were developed.

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