 Electrochemical cell with pressurized liquid electrolyte |
| What is claimed is: 1. An electrochemical cell comprising a pressurized cell can having a narrowed ... |
|
| Method of operating a solid electrolyte fuel cell |
| It is an object of the present invention to overcome the above-mentioned disadvantages and provide ... |
|
| Mercury-free zinc electrode |
| What is claimed is: 1. An improved zinc electrode consisting of mercury-free material, said ... |
|
| Rechargeable battery cathode from P2- phase sodium cobalt dioxide |
| What is claimed is: 1. An improved battery of the type which includes a cathode means, an anode ... |
|
| Closed loop reactant/product management system for electrochemical galvanic energy device |
| OF THE INVENTION The present invention, generally, and the systems shown in the figures of the ... |
|
| Cover for battery cable terminal |
| The present invention provides a battery cable terminal cover of the hinged or clamshell type, ... |
|
| Fiber-reinforced metallic composite material |
| OF THE INVENTION The composite material of this invention comprises as a matrix a metal or alloy ... |
|
| Process for the surface oxidisation of aluminum |
| What I claim is: 1. A process for the surface oxidisation of an aluminium coating deposited on a ... |
|
| Apparatus for metallization of fibers |
| Accordingly, it is an object of the present invention to provide an apparatus for effectively ... |
|
| Method for forming a decoration on a coating of polytetrafluoroethylene (PTFE) |
| What is claimed is: 1. A method for forming a decoration on a coating of polytetrafluoroethylene (PT... |
|
|
Catalytic recombination of corrosion evolved hydrogen in alkaline cells
| Details |
Inventors: Kordesch, Karl; Tomantschger, Klaus;
Assignee: Battery Technologies Inc. (Mississauga, CA)
Primary Examiner: Kalafut; Stephen J.
Assistant Examiner:
Attorney, Agent or Firm: Hewson; Donald E.
In rechargeable or primary, electrochemical cells, hydrogen may evolve. The invention concerns the use of an auxiliary electrode material to catalyse the recombination of pressurized hydrogen, for example, the hydrogen being at pressures ranging from 5 to 15 psig up to pressure relief of the cell. The cell is a sealed cell having a metal oxide cathode, a zinc anode and aqueous, alkaline electrolyte contacting both anode and cathode. The auxiliary electrode material, which may be mixed with the cathode material or be formed into a discrete auxiliary electrode, comprises a porous substrate and a catlyst for the absorbtion of pressurized hydrogen by the electrolyte. The substrate may be carbon, graphite or metal. The catalyst may be carbon, catalytically active noble metals, salts and oxides of lead, nickel, titanium, lanthanum, chromium, tantalum and alloys thereof, and the metals or mixtures of carbon with the salts or oxides. |
|
DETAILED DESCRIPTION We claim: 1.
A primary or rechargable electrochemical sealed cell in which hydrogen may evolve, said cell having a manganese dioxide cathode, a zinc anode, an aqueous alkaline electrolyte contacting the anode and the cathode, and a further auxiliary cathode material comprising a porous substrate and a catalyst for the absorption of pressurized hydrogen within said cell; wherein said pressurize hydrogen is absorbed at least by the said auxiliary cathode material in the presence of said alkaline electrolyte; wherein said auxiliary cathode material is at least partially wetted by said alkaline electrolyte; and wherein said auxiliary cathode material and said manganese dioxide cathode are in intimate physical contact one with the other, with no substantial electrical resistance therebetween.
2.
The primary or rechargable cell of claim 1, in which catalyst catalyses the absorption of hydrogen pressurized in the range of from at least 5 to 15 psig up to pressure relief of the cell.
3.
The primary or rechargable cell of claim 2 in which the substrate of the auxiliary cathode is chosen from the group consisting of carbon, graphite and metal and the catalyst is chosen from the group consisting of carbon; catalytically active metals; salts and oxides of lead, nickel, titanium, lanthanum, chromium, tantalum, and alloys thereof and said catalytically active metals; and mixtures of carbon with said metals, salts or oxides.
4.
The primary or rechargeable cell of claim 3 in which the catalytically active metal is a noble metal.
5.
The primary or rechargeable cell of claim 4, in which the noble metal is selected from platinum, palladium, ruthenium, rhodium, iridium, osmium and silver.
6.
The primary or rechargable cell of claim 3 in which the catalytically active metal is nickel or an alloy of nickel with lanthanum or titanium.
7.
The primary or rechargeable cell of claim 3, in which the auxiliary cathode material is mixed with said manganese dioxide cathode.
8.
The primary or rechargable cell of claim 4, in which the ratio of noble metal to said manganese dioxide of said cathode is substantially 30:70
|
| Related patents |
|
|
Alkaline storage battery and method of producing negative electrode thereof
OF THE INVENTION The present invention will be described hereunder with respect to various examples. In the examples, the hydrogen absorbing alloy used for the negative ...
|
|
|
Recombination of evolved oxygen in galvanic cells using transfer anode material
What we claim is: 1. A rechargeable electrochemical cell having a metal oxide cathode, metal anodic material, a current collector in intimate physical association with ...
|
|
|
Catalytic hydrogen storage electrode materials for use in electrochemical cells and electrochemical cells incorporating the materials
OF THE INVENTION In accordance with the present invention, there is provided a family of hydrogen storage alloys, derived from the V-Ti-Zr-Ni and V-Ti-Zr-Ni-Cr alloys ...
|
|
|
Gas-tight, sealed metal oxide/hydrogen storage battery
It is therefore the primary object of the present invention to provide a storage battery of the type previously mentioned in which the negative electrode is more ...
|
|
|
Sealed batteries with zinc electrode
According to the present invention there is provided an electrochemical cell, comprising: a first sealed compartment containing a first electrolyte and a first gas space;...
|
|
|
Aircraft battery
The foregoing and other objects of the invention are accomplished by a lead-acid aircraft battery having a relatively thin-walled molded polypropylene battery casing and ...
|
|
|
Metal halogen electrochemical cell
OF THE INVENTION Turning now to the sole FIGURE of the drawing, there is shown one embodiment of the cell of the present invention. As illustrated in the drawing, an ...
|
|
|
Method for improving stability of Li/MnO.sub.2 cells
What is claimed is: 1. A method for improving the stability of a non-aqueous cell containing an anode comprised of a metal selected from the group consisting of alkali ...
|
|
|
Means of providing pressure relief to sealed galvanic cell
Briefly stated, in accordance with one aspect of the invention the foregoing objects are achieved by providing a generally tubular galvanic cell envelope with a ...
|
|
|
Fireproof elastic packing material
What is claimed is: 1. An elastic packing material comprising a shapeable composition which is elastic at low temperature and which swells at high temperature to form a ...
|
|
|
Fuel Cells 
