Novel dielectric films with high energy density

2015 ◽  
Author(s):  
Mattewos Tefferi ◽  
Rui Ma ◽  
Greg Treich ◽  
Greg Sotzing ◽  
Ramamurthy Ramprasad ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Dielectric Films

High-energy-density dielectric films based on polyvinylidene fluoride and aromatic polythiourea for capacitors

2014 ◽  
Vol 2 (38) ◽  
pp. 15803-15807 ◽  
Author(s):  
Weiping Li ◽  
Long Jiang ◽  
Xin Zhang ◽  
Yang Shen ◽  
C. W. Nan
Keyword(s):  
Energy Density ◽  
Polyvinylidene Fluoride ◽  
High Energy ◽  
High Energy Density ◽  
Dielectric Films

The fabrication of the ultra-thin polyvinylidene fluoride dielectric films for nanoscale high energy density capacitors

Polymer ◽  
2017 ◽  
Vol 132 ◽  
pp. 193-197 ◽  
Author(s):  
Xiong Xie ◽  
Mengbin Zhou ◽  
Luqiang Lv ◽  
Shuangyi Liu ◽  
Jun Shen
Keyword(s):  
Energy Density ◽  
Polyvinylidene Fluoride ◽  
High Energy ◽  
High Energy Density ◽  
Dielectric Films

Ultrahigh–energy density lead-free dielectric films via polymorphic nanodomain design

Science ◽  
2019 ◽  
Vol 365 (6453) ◽  
pp. 578-582 ◽  
Author(s):  
Hao Pan ◽  
Fei Li ◽  
Yao Liu ◽  
Qinghua Zhang ◽  
Meng Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
High Performance ◽  
Functional Materials ◽  
High Energy ◽  
High Energy Density ◽  
Lead Free ◽  
Dielectric Films ◽  
Electronic Systems ◽  
Ultrahigh Energy ◽  
Power Densities

Dielectric capacitors with ultrahigh power densities are fundamental energy storage components in electrical and electronic systems. However, a long-standing challenge is improving their energy densities. We report dielectrics with ultrahigh energy densities designed with polymorphic nanodomains. Guided by phase-field simulations, we conceived and synthesized lead-free BiFeO3-BaTiO3-SrTiO3 solid-solution films to realize the coexistence of rhombohedral and tetragonal nanodomains embedded in a cubic matrix. We obtained minimized hysteresis while maintaining high polarization and achieved a high energy density of 112 joules per cubic centimeter with a high energy efficiency of ~80%. This approach should be generalizable for designing high-performance dielectrics and other functional materials that benefit from nanoscale domain structure manipulation.

A HIGH ENERGY DENSITY ZINC/OXYGEN BATTERY SYSTEM

1966 ◽  
Author(s):  
S. CHODOSH ◽  
E. KATSOULIS ◽  
M. ROSANSKY
Keyword(s):  
Energy Density ◽  
High Energy ◽  
High Energy Density ◽  
Battery System

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

Efficient Co-Harvesting of Solar Energy and Low-Grade Heat by Molecular Photoswitches for High Energy Density, Long-Term Stable Solar Thermal Battery

2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI
Keyword(s):  
Energy Density ◽  
Solar Energy ◽  
High Performance ◽  
High Energy ◽  
Solar Thermal ◽  
High Energy Density ◽  
Low Grade ◽  
Thermal Battery ◽  
Low Grade Heat

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.

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