Method of making sintered plaque nickel electrodes

Details Method of making sintered plaque nickel electrodes Method of making sintered plaque nickel electrodes

1980-03-03

1981-09-29

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 24, 204 56R, H01M 1044, C25D 1100

Patent

active

042921430

ABSTRACT:
The improved method of the invention comprises electrochemically depositing nickel hydroxide into the pores of a clean sintered nickel plaque cathode from heated aqueous electrolyte at acid pH in a treating zone containing an anode, while minimizing corrosion of the plaque. The electrochemical deposition is continued only until a loading level of about 2 grams per cubic centimeter of void volume in the plaque is obtained. This is in order to avoid thickening, swelling and stressing of the plaque. The method is carried out without the need for a wetting agent in the electrolyte. The plaque should be sufficiently clean so as to be readily wetted throughout by the electrolyte. Such a clean condition can be produced by heating the plaque to at least about 700.degree. C. Plaque corrosion is minimized by polarizing the plaque cathode as by the use of a sacrificial cadmium cathode. Plaque corrosion can also be minimized by maintaining an electric current in the electrolyte whenever the plaque is present therein. It is preferred to carry out the deposition while applying a substantially constant level of current to the electrodes. Loading levels of nickel hydroxide in excess of 7.7 ampere hours per cubic inch can be effected for an improved product.

REFERENCES:
patent: 2969414 (1961-01-01), Fleischer
patent: 3507699 (1970-04-01), Pell
patent: 3827911 (1974-08-01), Pickett
Journal of the Electrochemical Society, vol. 94, _Jul.-Dec. 1948, pp. 289-299.

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