Method of manufacturing nickelous positive-electrode active mate

Details Method of manufacturing nickelous positive-electrode active mate Method of manufacturing nickelous positive-electrode active mate

1997-02-20

1999-03-09

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

H01M 204

Patent

active

058798358

ABSTRACT:
A method of manufacturing a nickelous positive-electrode active material for an alkaline battery has a formation process in which nickel hydroxide and cobalt hydroxide are formed by adding an alkali metal hydroxide to a reaction system containing nickel ions and cobalt (II) ions. The method comprises at least one step of removing any oxidant which oxidizes the cobalt (II) ions into cobalt (III) ions, during or before the formation process. An expedient for the removal of the oxidant is, for example, to reduce and remove the oxidant by adding a reductant, such as L-ascorbic acid, to the reaction system. The reductant should preferably have an oxidation potential which is lower than the reduction potential of oxygen. Besides, the method should preferably comprise the step of removing the cobalt (III) ions, during or before the formation process.

REFERENCES:
patent: 4208380 (1980-06-01), Hamalainen et al.
patent: 5569444 (1996-10-01), Blanchard et al.

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