scholarly journals Improving the Energy Density and Efficiency of the Linear Polymer PMMA with a Double-Bond Fluoropolymer at Elevated Temperatures

ACS Omega ◽  
2021 ◽  
Author(s):  
Fei Wen ◽  
Chenglong Zhu ◽  
Weifeng Lv ◽  
Ping Wang ◽  
Lin Zhang ◽  
...  
Keyword(s):  
Double Bond ◽  
Energy Density ◽  
Elevated Temperatures ◽  
Linear Polymer

Excellent comprehensive energy storage capabilities achieved in linear polymer composites via inserting acrylic rubber dielectric elastomers

2021 ◽  
Author(s):  
Jie Chen ◽  
Yifei Wang ◽  
Weixing Chen
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Polymer Composites ◽  
Linear Polymer ◽  
Dielectric Elastomers ◽  
Organic Film ◽  
Available Energy ◽  
Multilayer Composites ◽  
Potential Applications

Multilayer composites have the potential applications in organic film capacitors due to their excellent dielectric and breakdown characteristic. However, poor efficiency (η) and limited available energy density (Ue) of the...

A high-temperature dielectric polymer poly(acrylonitrile butadiene styrene) with enhanced energy density and efficiency due to a cyano group

2020 ◽  
Vol 8 (30) ◽  
pp. 15122-15129
Author(s):  
Fei Wen ◽  
Lin Zhang ◽  
Ping Wang ◽  
Lili Li ◽  
Jianguo Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Energy Density ◽  
Elevated Temperatures ◽  
Cyano Group ◽  
Acrylonitrile Butadiene Styrene ◽  
Promising Candidate ◽  
Excellent Thermal Stability ◽  
Poly Acrylonitrile ◽  
Dielectric Polymer ◽  
Butadiene Styrene

An ABS film, which exhibits a high gravimetric energy density of 6.3 J g−1 with satisfactory efficiency, excellent thermal stability, and cycling reliability at elevated temperatures, is a promising candidate for high power energy storage capacitors.

scholarly journals Sandwich-structured polymer nanocomposites with high energy density and great charge–discharge efficiency at elevated temperatures

2016 ◽  
Vol 113 (36) ◽  
pp. 9995-10000 ◽  
Author(s):  
Qi Li ◽  
Feihua Liu ◽  
Tiannan Yang ◽  
Matthew R. Gadinski ◽  
Guangzu Zhang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Temperature ◽  
Energy Density ◽  
Polymer Nanocomposites ◽  
Elevated Temperatures ◽  
High Energy ◽  
Operating Conditions ◽  
High Dielectric ◽  
Discharge Efficiency ◽  
Charge Discharge

The demand for a new generation of high-temperature dielectric materials toward capacitive energy storage has been driven by the rise of high-power applications such as electric vehicles, aircraft, and pulsed power systems where the power electronics are exposed to elevated temperatures. Polymer dielectrics are characterized by being lightweight, and their scalability, mechanical flexibility, high dielectric strength, and great reliability, but they are limited to relatively low operating temperatures. The existing polymer nanocomposite-based dielectrics with a limited energy density at high temperatures also present a major barrier to achieving significant reductions in size and weight of energy devices. Here we report the sandwich structures as an efficient route to high-temperature dielectric polymer nanocomposites that simultaneously possess high dielectric constant and low dielectric loss. In contrast to the conventional single-layer configuration, the rationally designed sandwich-structured polymer nanocomposites are capable of integrating the complementary properties of spatially organized multicomponents in a synergistic fashion to raise dielectric constant, and subsequently greatly improve discharged energy densities while retaining low loss and high charge–discharge efficiency at elevated temperatures. At 150 °C and 200 MV m−1, an operating condition toward electric vehicle applications, the sandwich-structured polymer nanocomposites outperform the state-of-the-art polymer-based dielectrics in terms of energy density, power density, charge–discharge efficiency, and cyclability. The excellent dielectric and capacitive properties of the polymer nanocomposites may pave a way for widespread applications in modern electronics and power modules where harsh operating conditions are present.

The Use of Ammonium Carbamate as a High Energy Density Thermal Energy Storage Material

2011 ◽  
Vol 1325 ◽  
Author(s):  
Joel E. Schmidt ◽  
Douglas S. Dudis ◽  
Douglas J. Miller
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Elevated Temperatures ◽  
High Energy ◽  
Heat Fluxes ◽  
High Energy Density ◽  
Low Grade ◽  
Temperature Range ◽  
Ammonium Carbamate ◽  
Thermally Conductive

ABSTRACTPhase change materials (PCMs) often have higher specific energy storage capacities at elevated temperatures. Thermal management (TM) systems capable of handling high heat fluxes in the temperature range from 20–100°C are necessary but lacking. State of the art PCMs in this temperature range are usually paraffin waxes with energy densities on the order of a few hundred kJ/kg or ice slurries with energy densities of the same magnitude. However, for applications where system weight and size are limited, it is necessary to improve this energy density by at least an order of magnitude. The compound ammonium carbamate, [NH4][H2NCOO], is a solid formed from the reaction of ammonia and carbon dioxide which endothermically decomposes back to CO2 and NH3 in the temperature range 20-100°C with an enthalpy of decomposition of ∼2,000 kJ/kg. Various methods to use this material for TM of low-grade, high-flux heat have been evaluated including: bare powder, thermally conductive carbon foams, thermally conductive metal foams, hydrocarbon based slurries, and a slurry in ethylene glycol or propylene glycol. A slurry in glycol is a promising system medium for enhancing heat and mass transfer for TM. Progress on material and system characterization is reported.

Ultrahigh Charge-discharge Efficiency and High Energy Density of High-temperature Polymer Sandwiched

2021 ◽  
Author(s):  
Hanxi Chen ◽  
Zhongbin Pan ◽  
Yu Cheng ◽  
Xiangping Ding ◽  
Jinjun Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Energy Density ◽  
Elevated Temperatures ◽  
Dielectric Materials ◽  
High Energy ◽  
High Energy Density ◽  
Capacitive Energy Storage ◽  
New Generation ◽  
Discharge Efficiency ◽  
Charge Discharge

A new generation of high-temperature dielectric materials toward capacitive energy storage is highly demanded as power electronics are always exposed to elevated temperatures in high-power applications. Polymer dielectric materials, an...

scholarly journals Vanadium Oxygen Fuel Cell Utilising High Concentration Electrolyte

Batteries ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 24 ◽  
Author(s):  
Mandar Risbud ◽  
Chris Menictas ◽  
Maria Skyllas-Kazacos ◽  
Jens Noack
Keyword(s):  
Fuel Cell ◽  
Energy Density ◽  
Elevated Temperatures ◽  
Vanadium Redox Flow Battery ◽  
High Concentration ◽  
Precipitation Inhibitors ◽  
Added Benefit ◽  
Current Densities ◽  
Oxygen Fuel ◽  
Vanadium Redox

A vanadium oxygen fuel cell is a modified form of a conventional vanadium redox flow battery (VRFB) where the positive electrolyte (VO2+/VO2+ couple) is replaced by the oxygen reduction (ORR) process. This potentially allows for a significant improvement in energy density and has the added benefit of overcoming the solubility limits of V (V) at elevated temperatures, while also allowing the vanadium negative electrolyte concentration to increase above 3 M. In this paper, a vanadium oxygen fuel cell with vanadium electrolytes with a concentration of up to 3.6 M is reported with preliminary results presented for different electrodes over a range of current densities. Using precipitation inhibitors, the concentration of vanadium can be increased considerably above the commonly used 2 M limit, leading to improved energy density.

Evidence for the structure, and for a non-chair conformation in ring F of two isomeric N-formylsolasodines

1983 ◽  
Vol 36 (2) ◽  
pp. 325 ◽  
Author(s):  
W Gaffield ◽  
M Benson ◽  
WF Haddon ◽  
RE Lundin
Keyword(s):  
Double Bond ◽  
Mass Spectra ◽  
Elevated Temperatures ◽  
Chair Conformation ◽  
Restricted Rotation ◽  
Nitrogen Inversion

Formylation of solasodine results in the formation of two different 3,N-diformylsolasodines whose isomerism is due to a difference in stereochemistry at C22 rather than restricted rotation about the C=N partial double bond of the amide or nitrogen inversion as previously proposed. Mass spectra, 1H and I3C n.m.r. spectra have shown the isomers to possess 22R,25R (major) and 22S,25R (minor) stereochemistry. The 22S,25R isomer is thermodynamically preferred at elevated temperatures while the 22R,25R isomer is kinetically favoured upon recyclization of the ring-F opened intermediate which forms upon heating of either isomer. A non-chair ring-F conformation is proposed for each isomer on the basis of 13C and 1H n.m.r. spectra.

High-Energy Density Dielectrics and Capacitors for Elevated Temperatures: Ca(Zr,Ti)O3

2013 ◽  
Vol 96 (4) ◽  
pp. 1209-1213 ◽  
Author(s):  
Haijoon Lee ◽  
Jeong Ryeol Kim ◽  
Michael J. Lanagan ◽  
Susan Trolier-McKinstry ◽  
Clive A. Randall
Keyword(s):  
Energy Density ◽  
Elevated Temperatures ◽  
High Energy ◽  
High Energy Density
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