Method of making sintered plaque cadmium electrodes

Details Method of making sintered plaque cadmium electrodes Method of making sintered plaque cadmium electrodes

1977-11-25

1978-10-17

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 56R, 204 96, C25D 908, C25B 116, C25B 1106

Patent

active

041207572

ABSTRACT:
The improved method of the invention comprises electrochemically depositing cadmium hydroxide into the pores of a sintered nickel plaque cathode from a heated electrolyte at acid pH and at controlled density in a treating zone containing an anode, at least periodically contacting the electrolyte during the electro chemical deposition with neutralizing agent selected from cadmium oxide and cadmium hydroxide to neutralize acid generated at the anode, and continuing the electrochemical deposition until an improved loading level of cadmium hydroxide within the cathode is obtained. The acid pH preferably is between 2 - 5 and the electrolyte preferably is in a concentration of 2 - 3 M and at an average temperature of about 85.degree. - 105.degree. C. Preferably, the current density is maintained at a level of less than one ampere per square inch in order to improve the loading level, which may be as high as about 2.6 grams of cadmium hydroxide per cubic centimeter of void volume in the cathode. The neutralizing agent may be disposed in a porous container in a separate reservoir zone connected to the treating zone so that the electrolyte can circulate therebetween and into direct contact with the neutralizing agent. The method results in a loading level of cadmium hydroxide in the sintered nickel plaque cathode as high as or higher than previously obtained and in a shorter period of time. The method is simple, inexpensive and efficient.

REFERENCES:
patent: 3203879 (1965-08-01), Mueller
patent: 3214355 (1965-10-01), Kandler
patent: 3455741 (1969-07-01), Schneider
patent: 3573101 (1971-03-01), Beauchamp
patent: 3779810 (1973-12-01), Kanetsuki
patent: 3873368 (1975-03-01), Pickett

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