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Electrical conduction and polarization of silica-based capacitors under electro-thermal poling

Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP

Nieves-Sanabria, Cesar N.; Wilke, Rudeger H.T.; Bishop, Sean R.; Lanagan, Michael T.; Clem, Paul G.

Electrical conduction in silica-based capacitors under a combined effect of intermediate electric field and temperature (2.5 - 10 kV/mm, 50-300°C) is dominated by localized motion of high mobility ions such as sodium. Thermally stimulated polarization and depolarization current (TSPC/TSDC) characterization was carried out on poled fused silica and AF32 glass samples. Two relaxation mechanisms were found during the depolarization step and an anomalous response for the second TSDC peak was observed. Absorption current measurements were performed on the glass samples and a time-dependent response was observed when subjected to different electro-thermal conditions. It was found that at low temperature (T = 175 °C) and short times, the current follows a linear behavior (I α V) while at high temperature (T = 250 °C), the current follows V0.5. TSPC/TSDC and absorption current measurements results led to the conclusion that (1) Poole-Frenkel dominates conduction at high temperatures and at longer times and that (2) ionic blockage and/or H+/H3O+ injection are responsible for the observed anomalous current response.

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TYPE Conference Paper YEAR 2021
ScopusOSTI

Fabrication of Solid-State Multilayer Glass Capacitors

IEEE Transactions on Components, Packaging and Manufacturing Technology

Wilke, Rudeger H.T.; Brown-Shaklee, Harlan J.; Casias, Adrian L.; Cunningham, Billy C.; Dean, Amanda N.; Vecchio, Michael A.; Vudatha, Rohith

Alkali-free glasses show immense promise for the development of high-energy density capacitors. The high breakdown strengths on single-layer sheets of glass suggest the potential for improved energy densities over existing state-of-the art polymer capacitors. In this paper, we demonstrate the ability to package thin glass to make solid-state capacitors. Individual layers are bonded using epoxy, leading to capacitors that exhibit stable operation over the temperature range -55 °C to +65 °C. This fabrication approach is scalable and allows for proof testing individual layers prior to incorporation of the stack, providing a blueprint for the fabrication of high-energy density capacitors.

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TYPE Journal Article YEAR 2017
ScopusOSTIDOI

Fabrication of Wound Capacitors Using Flexible Alkali-Free Glass

IEEE Transactions on Components, Packaging and Manufacturing Technology

Wilke, Rudeger H.T.; Baker, Amanda; Brown-Shaklee, Harlan J.; Johnson, Raegan L.; Hettler, Chad H.; Murata, Takashi; O'Malley, Patrick D.; Perini, Steve; Lanagan, Michael

Alkali-free glasses, which exhibit high energy storage densities (~35 J/cc), present a unique opportunity to couple high temperature stability with high breakdown strength, and thus provide an avenue for capacitor applications with stringent temperature and power requirements. Realizing the potential of these materials in kilovolt class capacitors with >1 J/cc recoverable energy density requires novel packaging strategies that incorporate these extremely fragile dielectrics. In this paper, we demonstrate the feasibility of fabricating wound capacitors using 50-μm-thick glass. Two capacitors were fabricated from 2.8-m-long ribbons of thin (50 μm) glass wound into 125-140-mm-diameter spools. The capacitors exhibit a capacitance of 70-75 nF with loss tangents below 1%. The wound capacitors can operate up to 1 kV and show excellent temperature stability to 150 °C. By improving the end terminations, the self-resonance can be shifted to above 1 MHz, indicating that these materials may be useful for pulsed power applications with microsecond discharge times.

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TYPE Journal Article YEAR 2016
ScopusOSTIDOI
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20 Results