Development of High Temperature Capacitors for High Density, High Temperature Applications

High-Temperature Poly(phthalazinone ether ketone) Thin Films for Dielectric Energy Storage

“…Concurrently, the value, a shape parameter that evaluates the scatter of data, increased from 12 to 17.4 from room temperature to 190°C, which suggests the decrease of variation of breakdown field with temperature. The obtained breakdown fields at high temperatures rivals or exceeds those reported for high-temperature dielectric polymers (10,20). For instance, Teflon perfluoroalkoxy exhibits a dielectric strength of ∼280 MV/m at 125°C (8).…”

“…The ever-shrinking microelectronic devices also call for high temperature capacitors, as heat dissipation increases nonlinearly with miniaturization of electronic circuits . Recent examples on high-temperature polymer capacitors such as polycarbonate, polyetherimide (PEI), Teflon perfluoroalkoxy, and polyphenylene sulfide (PPS) not only illustrate the promising progress made in this area but also reveal limitations in the classes of high-performance polymers investigated – . In this contribution, we report on the synthesis and characterization of poly(phthalazinone ether ketone) (PPEK) thin films for high-temperature capacitor applications.…”

Largely enhanced dielectric properties of polymer composites with HfO2 nanoparticles for high-temperature film capacitors

“…Moreover, extensive merits such as outstanding solvent solubility, mechanical durability and flame retardancy further make PEI one of the most promising polymers for hightemperature film capacitors. Irwin et al found that the PEI exerts superior insulation resistance than PC and PPS at temperatures up to 200 °C [18]. So far, PEI has been widely used as insulation components in magnet wires, electrical connectors, DC-DC converters and high-voltage switchgears [16,19].…”

Dielectric polymers for high-temperature capacitive energy storage

“…The presence of flexible linkages endows the thermoplastic nature of PEI, which substantially enhances their processability, including extrudable, injection-and compressionmoldable, and soluble in various organic solvents such as N-Methyl-2-pyrrolidone (NMP). 150 In addition to the structural and electrical insulation applications under extreme conditions such as automotive and aerospace, 151,152 5-μm thin PEI films processed by melt-extrusion followed with mechanical stretching are employed as dielectric films in DC-DC converters. 25,60 While the increase in flexibility offered by the ether linkages and alkyl groups of PEIs is achieved at the expense of a largely reduced T g (e.g., ~217 °C for Ultem® PEI), which is considerably lower than many of the richly aromatic PIs, the incorporated groups break the long-range conjugated structure of PIs.…”