Flexible Glass for High Temperature Energy Storage Capacitors

Abstract

Through the rolled‐up glass: We demonstrate an alkali‐free glass (• in figure) with high permittivity, low dielectric loss, high energy density, and potential self‐healing capabilities that significantly performs better for high temperature–high power capacitor applications prepared through a standard roll‐to‐roll process than currently used polymer films (shown for comparison).

Light weight high temperature polymer film capacitors with dielectric loss lower than polypropylene

“…The maximum delivered power density (P e , W/m 3 ) of a capacitor is related to the total stored energy density, U c and the RC time constant s RC by [13,27]:…”

“…High temperature polymers such as polycarbonate (PC), polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), polyetheretherketone (PEEK), modified PEEK, polyetherimide (PEI, UltemÒ 1000), polyimides (PI), and poly(tetrafluoroethylene-co-vinylidene difluoride-co-hexafluoropropylene) have been evaluated for high temperature film capacitor applications [10][11][12][13][14][15][16][17][18][19][20][21][22]. Due to their high T m and/or glass transition temperature (T g ), these polymers are thermally stable above125°C.…”

Glass as dielectric for high temperature power capacitors

“…G3 is an "alkali-free" glass, has a thickness of 50 µm, is made by Nippon Electric Glass, and has the product code OA-10G. G3 is the glass reported to be studied by Manoharan et al [6]. The thickness of the specimens was confirmed by light microscopy.…”

“…They suggest that randomly distributed bulk defects contribute to the breakdown of the glass. Recently, Manoharan et al examined the high temperature behaviour of alkali-free glass and write that a commercially available glass has a low dielectric loss of 0.25 to 0.35 % up to 300°C, although experimental data are presented up to 180°C [6]. In this work, we investigate experimentally the thermal properties of commercially available, thin, alkali-containing and alkali-free glasses by dielectric spectroscopy.…”

“…For high energy pulse power capacitors with PP as dielectric, which require additional packaging and voltage derating, an energy density of 2 J/cm 3 is ideal [1,2], although maximum energy density is around 6.5 J/cm 3 [3]. Thin, alkali-free glass has been reported to have an energy density approaching 35 J/cm 3 based on a high dielectric breakdown strength (12 MV/cm) and a high permittivity (6) in an alkali-free barium boroaluminosilicate glass [4]. Murata et al investigated the breakdown strength of thin, alkali-free glass with a steel pin electrode and metallic plate and measured a characteristic electrical breakdown field strength of 400 to 1100 MV/m as the glass substrate thickness decreased from 58 to 5 µm [5].…”