Capacitive energy storage device and method of producing the same
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United States of America Patent
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Jun 25, 2002
Grant Date -
Jan 31, 2002
app pub date -
Jul 27, 2001
filing date -
Jun 5, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A capacitive energy storage device for use at cryogenic temperatures is provided including first and second electrode layers having a layer of dielectric material there between. The electrode layers include an electrically conductive material having a formula selected from YBa.sub.2 Cu.sub.3 O.sub.x and Bi.sub.2 Ca.sub.2 Sr.sub.2 Cu.sub.3 O.sub.y. A method of storing electrical charge in a capacitive energy storage device is also provided. The method includes the steps of: (i) reducing the temperature of the capacitive energy storage device from a predetermined room temperature to a predetermined cryogenic operating temperature; (ii) applying a first electric field of a first field strength across the dielectric layer, wherein the magnitude of the first field strength is sufficient to cause the storage device to switch from a first operational state to a second operational state, the first operational state is characterized by a first dielectric constant, the second operational state is characterized by a second dielectric constant, and the second dielectric constant is substantially greater than the first dielectric constant; and (iii) charging the capacitive energy storage device in the second operational state.
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