Saft

Alcatel

Alsthom-atlantique

Societe Anonyme Dite: Saft

Jacques Bouet

Bernard Knosp

Annick Percheron-Guegan

Christian Jordy

Bernadette Pichon

Patrick Bernard

Jean-Michel Cocciantelli

Olivier Canet

Michel Mimoun

Daniel Gicquel

Bernard Crochepierre

The invention relates to a nickel electrode of the pasted type for a storage cell having an alkaline electrolyte, the electrode including a current collector and a paste. The electrode is manufactured by coating the collector with the paste which contains:

Pasted nickel electrode

A monophase hydridable material for the negative electrode of a nickel-metal hydride storage battery with a 'Lave's phase' structure of hexagonal C14 type (MgZn.sub.2) has the general formula:

Hydridable material for the negative electrode in a nickel-metal hydride

The material is derived from the compound TiNi, is a single-phase material and is expressed by the following general formula:

Hydridable material for the negative electrode of a nickel-hydride

The present invention provides a hydridable material for the negative electrode of a nickel-hydride storage cell mainly comprising a Laves phase of the C14 hexagonal type (MgZn.sub.2), characterized by the general formula: ##EQU1## where A represents at least one element from Ti, Y, Ce, Ca, and Mg, and where M is chosen from Cr, V, and Si.

A hydridable alloy material represented by the formula AB.sub.5 for the negative electrode of a nickel-hydride storage cell. A represents La.sub.(1-x-y-z) Ce.sub.x Nd.sub.y Pr.sub.z, where 0.ltoreq.x.ltoreq.0.784, 0.ltoreq.z.ltoreq.1, 0.1.ltoreq.x+z, 0&lt;y+z, x+y+z.ltoreq.1, and 0.ltoreq.y.ltoreq.0.205-1.17x+2.39x.sup.2 -1.57x.sup.3 -z(0.23-0.65x+1.18x.sup.2)+z.sup.2 (0.18-0.54x), and B represents Ni partially substituted by Mn, Al and Co.

A method of manufacturing a sponge support made of a metal selected from nickel, copper and lead, including (a) impregnating a sponge made of an organic material based on polyurethane, polyester or polyether with a solution of a nitrite or a sulfate of the metal, the concentration of the solution being a function of the desired weight per unit area for the sponge made of metal, the sponge made of an organic material has a porosity in the range of from 96% to 98% and a pore-size in the range of from 200 .mu.m to 400 .mu.m, and (b) heat-treating the impregnated sponge to remove the organic material.

Method of manufacturing a sponge-type support for an electrode in an

A paste for impregnating a three-dimensional metal sponge porous support, which impregnated porous support is dried to provide an electrode for an electrochemical cell. The paste comprises (i) an electrochemically active material selected from a metal hydride and a metal hydroxide in an amount of from 40% to 60% of the weight of the paste, and (ii) a gel containing xanthan in an amount of from 0.5% to 2% of the weight of the gel. The paste has a yield point greater than the shear stress due to the gravity so that the paste does not flow out of the impregnated support. Also disclosed is a method of making an electrochemical cell electrode, comprising the steps of preparing the above-described paste, impregnating the paste into a three-dimensional metal sponge porous support, and drying the paste. The inventive paste is advantageously retained in the support during the drying step.

Active mass for an electrode of an electrochemical cell, the active mass

A catalyst for an electrolyzer of basic solutions. An electrode catalyst for an electrolyzer of basic solutions, the catalyst consisting of a compound based on a mixed oxide of molybdenum and of nickel, characterized by the fact that the said compound is of the form (Ni.sub.1-x Cd.sub.x)MoO.sub.4, where 0.02.ltoreq.x.ltoreq.0.06.

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Paris, France

Jacques Bouet