초록 ▼

The present invention provides a thin-film palladium electrode as a reversible redox-active positive electrode in a supercapacitor configuration. A room-temperature chloroaluminate molten salt composed of an organic chloride, mixed with a molar excess of aluminum chloride, is used as the supercapaci

The present invention provides a thin-film palladium electrode as a reversible redox-active positive electrode in a supercapacitor configuration. A room-temperature chloroaluminate molten salt composed of an organic chloride, mixed with a molar excess of aluminum chloride, is used as the supercapacitor electrolyte. In this electrolyte, the palladium surface can be reversibly oxidized to an insoluble thin-film of palladium chloride. Reduction of this palladium chloride thin film back to palladium metal, generates a high current density. The capacitance of this supercapacitor electrode is 150-550 times that of a double-layer capacitor electrode. By combining the thin-film palladium supercapacitor positive electrode (cathode) with a suitable negative electrode (anode), e.g. a metallic aluminum anode, a high power supercapacitor cell, capable of delivering a charge at high current density, at near constant voltage of ca.1 V, is provided per the present invention. The cell of the invention can accordingly provide power for devices requiring pulsed electric power, e.g. lasers and for numerous other systems of high current demand, e.g. starters for electric vehicles.

대표청구항 ▼

A reversible redox supercapacitor electrochemical cell comprising: a) a cell housing, b) an electrolyte of a chloroaluminate molten salt in said housing, c) a metal (M)-containing cathode mounted in said electrolyte and d) an anode mounted in said electrolyte and spaced from said cathode, said anode

A reversible redox supercapacitor electrochemical cell comprising: a) a cell housing, b) an electrolyte of a chloroaluminate molten salt in said housing, c) a metal (M)-containing cathode mounted in said electrolyte and d) an anode mounted in said electrolyte and spaced from said cathode, said anode being more negative than said cathode on discharge of said cell, said anode having a redox couple within the electrochemical window of said electrolyte, such that said cell can deliver a charge at high current density, said cell being reversible such that on charge thereof, the cathode oxidizes to MCl2 as in insoluble thin-film and on discharge thereof the cathode reduces back to M to define a M/MCl2 cathode wherein M is selected from the group consisting of Pd and Ni.