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AssigneeS.C.P.S. Societe de Conseil et de Prospective Scientifique S.A.
InventorsBernard Bugnet, Denis Doniat
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Secondary electrochemical generators of the zinc-electrode alkaline type whose anode has a great capacity for cycling. The electrochemical generators according to the invention comprise zinc anodes made in such a manner as to increase within the active material the number of sites for formation of zinc during recharging, by a better draining of the electrical charges, obtained by using a dispersed secondary collector in the form of a conductive powder in the active mass, to which may advantageously be associated a principal support-collector of the high porous three-dimensional structured type having a high developed surface. These generators thus have zinc electrodes of improve cyclability, the number of charges and discharges that the electrode can perform under different regimes being increased.
A secondary zinc-anode alkaline electrochemical generator comprising an electrode support as a principle collector, and a solid active mass containing zinc oxide and, dispersed as homogeneously as possible in the active mass, a powder of an electrically conductive material, at least in part a conductive ceramic, that is chemically inert in the generator and has a high hydrogen-evolution over potential, wherein the electrically conductive material functions as a secondary collector dispersed within the solid mass and wherein the powder is at least in part constituted of a compound selected from the group consisting of hafnium nitride, hafnium carbide, magnesium carbide, magnesium nitride, magnesium silicide, niobium carbide, niobium nitride, titanium carbide titanium nitride, titanium silicide, vanadium nitride, and double carbides or nitrides of any two of the metals hafnium, magnesium, niobium, titanium and vanadium.
A secondary zinc-anode alkaline electrochemical generator comprising an electrode support as a principle collector, and a solid active mass containing zinc oxide and, dispersed as homogeneously as possible in the active mass, a powder of an electrically conductive material, at least in part a conductive ceramic, that is chemically inert in the generator and has a high hydrogen-evolution overpotential, wherein the electrically conductive material functions as a secondary collectors dispersed within the solid mass and wherein the powder is at least in part constituted of titanium suboxides.
A secondary zinc-anode alkaline electrochemical generator comprising an electrode support as a principle collector, and a solid active mass containing zinc oxide and, dispersed as homogeneously as possible in the active mass, a powder of an electrically conductive material, at least in part a conductive ceramic, that is chemically inert in the generator and has a high hydrogen-evolution overpotential, wherein the electrically conductive material functions as a secondary collector dispersed within the solid mass and, wherein a zinc electrode is produced by inserting an active anode mass enclosing the powder into a three-dimensional high porosity metallic or metalized support-collector of reticulated alveolar foam having a surface comprising between about 15 and 45 pores per linear centimeter at the surface.
A secondary zinc-anode alkaline electrochemical generator comprising an electrode support as a principle collector, and a solid active mass containing zinc oxide and, dispersed as homogeneously as possible in the active mass, a powder of an electrically conductive material, at least in part a conductive ceramic, that is chemically inert in the generator and has a high hydrogen-evolution overpotential, wherein the electrically conductive material functions as a secondary collector dispersed within the solid mass and wherein an antipolar mass introduced into the active mass of the zinc electrode is nickel hydroxide.
Dependencies are inferred from the claim text.