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Electrode material for accumulators and other electrochemical sources of current
| Details |
Inventors: Sandera, Josef; Calabek, Milan; Cenek, Miroslav; Koudelka, Vojtech; Kouril, Oldrich; Malik, Jiri; Vanacek, Josef;
Assignee: Prazska akumulatorka, narodni podnik (Mlada Boleslav, CS)
Primary Examiner: Skapars; Anthony
Assistant Examiner:
Attorney, Agent or Firm:
An improved active electrode composition for a plastic-bonded electrode of an electrochemical accumulator is described. A powder of the principal electrode active material is mixed with 1.5 - 60% by weight of oxalic and/or a salt thereof. The admixture of such ingredients with a suitable binding agent may then be applied to an expanded metallic collector and then heat and pressure treated in a conventional manner to obtain the required electrode. |
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DETAILED DESCRIPTION What is claimed is: 1.
An improved active composition of a completed plastic-bonded electrode in an electrochemical current source, the composition consisting essentially of (1) a powdered base active material selected from the group consisting of cadmium, nickel, zinc and zinc oxide, (2) a binding agent, and (3) a substance selected from the group consisting of oxalic acid and a salt thereof, the last-mentioned substance being present in the composition in the range of 1.
5-60% by weight.
2.
A composition as defined in claim 1, in which the base active material is cadmium.
3.
A composition as defined in claim 1, in which the base active material is zinc oxide.
4.
A composition as defined in claim 1, in which the binding agent is pulverized polyethelene.
Description:
BACKGROUND OF THE INVENTION The invention relates to compositions for a plastic-bonded or pocket-type cadmium, nickel or zinc electrode for an electrochemical source of current.
The electrode composition is particularly suitable for electrodes useful in accumulators of the nickel-cadmium, silver-cadmium, nickel-zinc, silver-zinc, and zinc-air type.
Pocket-type electrodes for such applications are conventionally formed by applying an active electrode composition to a separate expanded or grid-like frame of a separate metal.
Such construction has been found to be relatively expensive and laborious to produce.
Moreover, it has been found to have a relatively small degree of utilization of the electrode active material during its life cycle and a relatively large internal resistance vis-a-vis electrodes formed by conventional sintering processes.
On the other hand, sintered electrodes for such applications generally cost nearly twice as much to produce as a pocket-type electrode of the same capacity.
SUMMARY OF THE INVENTION The present invention provides an improved active electrode composition for a plastic-bonded electrode that exhibits a relatively high degree of active material utilization and a relatively low internal resistance compared to designs of the prior art
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