Capacitive energy storage device and method of producing the same

摘要

A capacitive energy storage device for use at cryogenic temperatures is provided comprising first and second electrode layers having a layer of dielectric material there between. The electrode layers comprise an electrically conductive material having a formula selected from the group consisting of: YBa2Cu3Ox and Bi2Ca2Sr2Cu3Oy. A method of storing electrical charge in a capacitive energy storage device is also provided. The method comprises 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.