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High Temperature Performance of Oxide Film Capacitors
Keywords: high temperature , electronics, capacitors
Film capacitors that perform well at temperatures exceeding 200C, while retaining self-healing properties (i.e. “graceful” or “benign” failure) and with energy densities in excess of 1 J/cm3 are an enabling technology for many applications in automotive, geophysical exploration, aerospace, and the military. To address this need Faradox Energy Storage, Inc. has produced and is testing temperature-stable film capacitors fabricated using amorphous oxides as the dielectric material. The capacitors are made by depositing thin films of an oxide dielectric on both sides of a metalized polyimide substrate to form dielectric-coated electrodes. Currently Faradox is producing 2” long, 1/4” diameter 2 uF, 100 VDC capacitors. In this paper we present test data demonstrating that oxide film capacitors have relatively stable properties over a wide temperature range and retain excellent self-healing properties. Measurements include 4 sets of capacitors tested by different 3rd Party test facilities using a variety of test conditions including: • Life testing at 250C for over 1000 hours with measurements of capacitance, leakage, dF and ESR. • Capacitance versus voltage, temperature and frequency • Impedance, ESR, and dF versus frequency and temperature and voltage Data will also be presented showing that the effective energy density of oxide film capacitors compares favorably with state-of-the art high temperature ceramic capacitors. This work was partially supported by DOE grant DE-FG02-08ER85203.
Keith D. Jamison, CEO
Faradox Energy Storage, Inc.
Austin, TX

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