High temperature polymer film dielectrics for aerospace power conditioning capacitor applications

Venkatasubramanian, N.; Dang, Thuy D.; Bai, Zongwu; McNier, Victor K; DeCerbo, Jennifer N.; Tsao, Bang‐Hung; Stricker, Jeffery T.

doi:10.1016/j.mseb.2009.12.038

Cited by 83 publications

(46 citation statements)

References 9 publications

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“…This brings extra weight, volume and energy consumption to the integrated power system and reduces its reliability and efficiency. The upsurge in lightweight and flexible electronic devices has also created a tremendous demand for high-temperature dielectric polymers, as the heat generated by electronic devices and circuitry increases exponentially with miniaturization and functionality.A variety of high-performance engineering polymers have been considered as possible high-temperature dielectric materials to address these urgent needs [15][16][17][18][19] . Until now, the key criteria established for evaluating high-temperature dielectric polymers has been the glass transition temperature (T g ) and thermal stability.…”

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confidence: 99%

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Flexible high-temperature dielectric materials from polymer nanocomposites

Gadinski

Zhang

et al. 2015

Nature

1,634

1,167

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Dielectric materials, which store energy electrostatically, are ubiquitous in advanced electronics and electric power systems. Compared to their ceramic counterparts, polymer dielectrics have higher breakdown strengths and greater reliability, are scalable, lightweight and can be shaped into intricate configurations, and are therefore an ideal choice for many power electronics, power conditioning, and pulsed power applications. However, polymer dielectrics are limited to relatively low working temperatures, and thus fail to meet the rising demand for electricity under the extreme conditions present in applications such as hybrid and electric vehicles, aerospace power electronics, and underground oil and gas exploration. Here we describe crosslinked polymer nanocomposites that contain boron nitride nanosheets, the dielectric properties of which are stable over a broad temperature and frequency range. The nanocomposites have outstanding high-voltage capacitive energy storage capabilities at record temperatures (a Weibull breakdown strength of 403 megavolts per metre and a discharged energy density of 1.8 joules per cubic centimetre at 250 degrees Celsius). Their electrical conduction is several orders of magnitude lower than that of existing polymers and their high operating temperatures are attributed to greatly improved thermal conductivity, owing to the presence of the boron nitride nanosheets, which improve heat dissipation compared to pristine polymers (which are inherently susceptible to thermal runaway). Moreover, the polymer nanocomposites are lightweight, photopatternable and mechanically flexible, and have been demonstrated to preserve excellent dielectric and capacitive performance after intensive bending cycles. These findings enable broader applications of organic materials in high-temperature electronics and energy storage devices.

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confidence: 99%

“…A variety of high-performance engineering polymers have been considered as possible high-temperature dielectric materials to address these urgent needs [15][16][17][18][19] . Until now, the key criteria established for evaluating high-temperature dielectric polymers has been the glass transition temperature (T g ) and thermal stability.…”

mentioning

confidence: 99%

Flexible high-temperature dielectric materials from polymer nanocomposites

Gadinski

Zhang

et al. 2015

Nature

1,634

1,167

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“…1B). It is important to note that the low-field room temperature dielectric loss is drastically different from the loss shown at high electric fields and elevated temperatures because of the nonlinear conduction related to charge injection and leakage current (20)(21)(22)(23). Indeed, at 150°C and 200 MV m −1 , the dielectric loss rises rapidly from 18% of the pristine c-BCB to more than 47% of c-BCB/BT as determined from the electric displacementelectric field (D-E) loops (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The electronic conduction has been identified as the main loss mechanism of dielectrics operating at elevated temperatures (21)(22)(23), which is responsible for a sharp increase in the dielectric loss as well as substantial reductions in U e and associated η with increasing applied fields and temperatures. Phase-field simulations have been performed to better understand the leakage current observed in the nanocomposites.…”

Section: Discussionmentioning

confidence: 99%

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

Liu

Yang

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

338

202

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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.electrical energy storage | dielectric | polymer nanocomposites | capacitors | high temperature F ilm capacitors store electrical energy in dielectric materials in the form of an electrostatic field between two electrodes. They possess the highest power density (on the order of megawatts) and the best rate capability (on the order of microseconds) among the electrical energy storage devices and are critical for power electronics, power conditioning, and pulsed power applications (1-3). For instance, DC bus capacitors are essential components in the power inverters of electric vehicles for the conversion of direct current to alternating current, which is required to drive the vehicle's motor. Compared with ceramics, polymeric materials offer inherent advantages for capacitors, including their light weight, facile processability, scalability, high breakdown strength, and graceful failure mechanism (1-5). However, dielectric polymers often suffer from low operating temperatures, which fall short of the emerging demands for energy storage and conversion in harsh environments commonly present in automobile, aerospace power systems, and advanced microelectronics (6, 7). For example, to accommodate biaxially oriented polypropylen...

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“…9 A number of polymer, composite and ceramic materials have potential for high-temperature capacitors. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Among them, the ceramic-based ferroelectric materials are the most promising due to their inherently good temperature stability and dielectric properties. [12][13][14][15][16][17][18][19][20][21][22][23][24][25] As a consequence of new regulations that restrict the use of toxic elements in consumer products, 26 considerable efforts have been made in the last years to produce nontoxic lead-free ferroelectric materials with suitable dielectric properties.…”

Section: Introductionmentioning

confidence: 99%