Abstract: A positive electrode of an accumulator with an alkaline electrolyte comprising a nickel-based hydroxide and a lithiated oxide of formula LixMO2 wherein M represents at least one transition metal, 0.1?x?1, said lithiated oxide having a specific surface area as measured by the BET technique of less than 40 m2/g and a grain size of less than 1 ?m. A method for making a lithiated oxide of at least one transition metal comprising the steps of: a) providing a powder of an hydroxide of said at least one transition metal, b) suspending the powder in a lithine solution in the presence of a stream of a oxidizing gas in order to form a lithiated oxide of said at least one transition metal, the lithine concentration being at least equal to about 1 mol/L, c) adding to the suspension of step b) a solution containing an oxidizing compound, d) filtering the suspension, e) washing and drying the suspension.

Abstract: The invention relates to a composition for electrodes comprising a material M selected from a nickel-based hydroxide and a hydrogen-fixing alloy, and a pentavalent niobium oxide Nb2O5 of monoclinic structure. The invention also proposes a positive electrode for an alkaline accumulator and a negative electrode for a nickel-metal hydride accumulator comprising the composition according to the invention as well as an alkaline accumulator comprising at least one electrode according to the invention.

Abstract: An electrode including a conductive metal support and a paste including an electrochemically-active material and a binder. The binder includes a compound of silane type, and a polymer having at least one acrylic monomer, and representing at least approximately 0.15% of the weight of said paste. The use of this binder improves the calendar or cycle life of the battery at a temperature greater than or equal to 25° C., preferably at a temperature greater than or equal to 40° C.

Abstract: A positive electrode of an accumulator with an alkaline electrolyte comprising a nickel-based hydroxide and a lithiated oxide of formula LixMO2 wherein M represents at least one transition metal, 0.1?×?1, said lithiated oxide having a specific surface area as measured by the BET technique of less than 40 m2/g and a grain size of less than 1 ?m. A method for making a lithiated oxide of at least one transition metal comprising the steps of: a) providing a powder of an hydroxide of said at least one transition metal, b) suspending the powder in a lithine solution in the presence of a stream of a oxidizing gas in order to form a lithiated oxide of said at least one transition metal, the lithine concentration being at least equal to about 1 mol/L, c) adding to the suspension of step b) a solution containing an oxidizing compound, d) filtering the suspension, e) washing and drying the suspension.

Abstract: There are provided a non-sintered positive electrode for an alkaline secondary cell comprising a current conductive support and a paste comprising an electrochemically active material and a binder comprising at least one polymer a) other than a fluorinated polymer or a thickener and containing at least one acrylate or acetate function, in a weight percentage less than or equal to 1% of the weight of the paste, at least one fluorinated polymer b), in a weight percentage of from 0.5 to 4% of the weight of the paste and at least one thickener c) in a weight percentage less than or equal to 0.3% of the weight of the paste, and a method of producing a non-sintered electrode.

Abstract: An electrode including a conductive metal support and a paste including an electrochemically-active material and a binder. The binder includes a compound of silane type, and a polymer having at least one acrylic monomer, and representing at least approximately 0.15% of the weight of said paste. The use of this binder improves the calendar or cycle life of the battery at a temperature greater than or equal to 25° C., preferably at a temperature greater than or equal to 40° C.

Abstract: An electrode comprising a metallic conductive support and a paste comprising an electrochemically active substance and a binder; the binder comprising at least one ethylene-vinyl acetate copolymer in a proportion by weight of at least approximately 0.25% relative to the weight of said paste, the binder comprising neither polystyrene nor butadiene copolymer. An alkaline-electrolyte battery comprising such an electrode.

Abstract: A non-sintered electrode containing a two-dimensional conductive support covered in a layer containing an electrochemically active material and a binder which is a mixture of a styrene-acrylate copolymer and a cellulose compound chosen from methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxypropylcellulose and hydroxyethylcellulose. The proportion of the styrene-acrylate copolymer is less than 4% by weight of the active layer.

Abstract: An electrochemical generator comprising at least one negative electrode and at least one positive electrode, said positive electrode comprising a paste comprising an electrochemically active material, a binder and strontium sulphate SrSO4, the proportion by weight of strontium sulphate in said paste being greater than 0.1% and less than or equal to 10%. This generator exhibits a reduced deterioration in performances at a high discharge rate.

Abstract: An electrode including a conductive metal support and a paste including an electrochemically-active material and a binder. The binder includes a compound of silane type, and a polymer having at least one acrylic monomer, and representing at least approximately 0.15% of the weight of said paste. The use of this binder improves the calendar or cycle life of the battery at a temperature greater than or equal to 25° C., preferably at a temperature greater than or equal to 40° C.

Abstract: The invention relates to an alkaline electrochemical cell of improved lifetime, including at least one compound based on barium or strontium, said compound being present in the cell with the exception of the cathode. The invention also provides a method of fabricating such a cell.

Abstract: The subject of the present invention is a non-sintered electrode containing a two-dimensional conductive support covered by a layer containing an electrochemically active material and a binder which is a mixture of a styrene-acrylate copolymer and a cellulose compound chosen from methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxypropylcellulose and hydroxyethylcellulose.

Abstract: The present invention provides an electrochemically active material comprising a hydridable alloy whose surface is covered in a protective layer constituted mainly by a nickel hydroxide. The layer is preferably constituted by at least 80% by weight of nickel hydroxide and includes up to 20% by weight of at least one other metal which may be taken from Mn, Al, Co, Cr, Fe, and Cu. Also preferably, the layer represents 1% to 4% by weight of the hydridable alloy.

Abstract: A non-sintered electrode includes a metal two-dimensional conductive support and a paste comprising an electrochemically active material containing nickel hydroxide and a binder which is a mixture of an elastomer consisting of a butadiene polymer and an ethylene/vinyl acetate copolymer.