Saft

Saft Groupe Sa

Stéphanie Chevalier

Mélanie Dendary

Philippe Desprez

Patrick Bernard

Claudette Audry

Rune Sjövall

Björn Marlid

Jerry Gottfridsson

An asymmetrical supercapacitor including an alkaline electrolyte, at least one separator, at least one positive electrode including a nickel-based hydroxide and a nickel-based current collector, and at least one negative electrode including a nickel-based current collector and having a porous three-dimensional structure. Some pores are open, the mean diameter of the open pores being greater than or equal to 100 &#x3bc;m and being less than or equal to 300 &#x3bc;m and two contiguous open pores () communicate by at least one opening () the mean diameter of which is greater than or equal to 35 &#x3bc;m and less than or equal to 130 &#x3bc;m. The three-dimensional structure includes a mixture including at least one activated carbon, at least one electron-conducting additive, and a binding agent including at least one elastomer polymer and at least one thickening polymer.

Asymmetrical supercapacitor with alkaline electrolyte comprising a three-dimensional negative electrode and method for producing same

The object of the invention is an electrode comprising a continuous current collector (1) wherein 50% or more of the surface of said collector has a roughness Ra1 comprised between 0.8 and 15 &#x3bc;m, measured for a base length comprised between 2 and 200 &#x3bc;m, said collector being coated with a mixture (2) comprising active carbon having a specific surface area greater than or equal to 500 m/g and a binder comprising a mixture of at least one cellulosic compound and at least one styrenic copolymer. The object of the invention is also an asymmetric supercapacitor comprising at least one electrode according to the invention. The invention also relates to a method for making a carbon electrode for an asymmetric supercapacitor.

Negative electrode for asymmetric supercapacitor having a positive electrode based on nickel hydroxide and an alkaline electrolyte and method for making same

The hydration of cadmium oxide in the presence of nickel acetate gives the possibility of obtaining a compound of general formula CdNi(OH)(CHCO)with 0&#x3c;x&#x2266;0.05 and 0&#x3c;y&#x2266;0.10. This compound may be advantageously, used as an electrochemically active material of an anode of the envelope type of a nickel cadmium generator. This anode does not contain any sulfates responsible for the formation of short-circuits. Further, this anode has a high electrochemical yield. A method for preparing this compound and the anode is described.

Active material of a nickel-cadmium generator negative electrode

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Bordeaux, France

Stéphanie Chevalier