Abstract: A non-sintered nickel electrode contains a conductive support and a paste comprising an electrochemically active material containing nickel hydroxide and a binder which is a mixture of an elastomer and a crystalline polymer. The proportion of the elastomer is in the range 25% to 60% by weight of the binder and the proportion of the crystalline polymer is in the range 40% to 75% by weight of the binder.

Abstract: A negative electrode for an alkaline electrochemical cell. The electrode comprises an active material and a hydrophilic agent constituted by small cylindrical rods of polyolefin provided with hydrophilic groups. The mean length of the rods is less than 50 microns and the mean diameter thereof is less than 20 microns. A method of manufacturing a negative electrode in which hydrophilic rods are made by fragmenting long polyolefin fibers having a mean diameter of less than 20 microns by oxidizing them, with the rods being mixed with the active material and the mixture being applied to a current conductor.

Abstract: In a method of characterizing a polymer binder for cell electrodes in contact with an electrolyte and including a current collector and a paste containing an electrochemically active material and said binder, a spreading coefficient of the binder on the active material is calculated from the measured angle of contact between standard liquids and the active material and the binder, respectively. An interaction energy of the binder with the electrolyte is calculated from the measured angle of contact between the electrolyte and the binder. The binder is selected such that the spreading coefficient is less than zero and the interaction energy is at least 60 mJ/m.sup.2.

Abstract: The present invention concerns a negative electrode for an alkaline cell, comprising a current collector supporting a paste containing an electrochemically active material and a binder, characterized in that said binder is a polymer containing hydrophilic and hydrophobic groups, said polymer being selected from an acrylic homopolymer, copolymer and terpolymer, an unsaturated organic acid copolymer and an unsaturated acid anhydride copolymer.

Abstract: The present invention concerns an electrode for an alkaline electrolyte secondary cell, comprising a current collector supporting a paste containing an electrochemically active material and a binder, characterized in that said binder is a copolymer selected from copolymers of maleic anhydride and a vinyl monomer, said binder being cross-linked after said electrode has been formed.

Abstract: 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<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.

Abstract: A rechargeable electrochemical cell whose anode is based on lithium or a lithium alloy, whose electrolyte is constituted by a solution of a lithium salt in a non-aqueous solvent, and whose cathode material is based on crystallized vanadium oxide, wherein the vanadium oxide contains a .gamma.' phase due to chemical or electrochemical oxidation of a .gamma. phase of LiV.sub.2 O.sub.5 obtained by inserting a number of atoms of lithium per mole of V.sub.2 O.sub.5 into said oxide, where said number lies in the range 0.9 to 2.