Nickel electrode active material; a nickel electrode and a nicke

Details Nickel electrode active material; a nickel electrode and a nicke Nickel electrode active material; a nickel electrode and a nicke

1995-09-19

1997-05-13

Gorgos, Kathryn L.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

204291, 204292, H01M 432, H01M 452, H01M 458

Patent

active

056291116

ABSTRACT:
Fine-grained nickel electrode active material, each of which contributing to electrode reaction; production method of the fine-grained nickel electrode active material; and a nickel alkali storage cell of high capacity which is excellent in over discharge characteristics. In order to produce the fine-grained nickel electrode active material, fine-grained nickel hydroxide is precipitated by adding a given amount of alkali to solution in which at least a nickel compound is dissolved while the solution is stirred. Each of the fine-grained nickel hydroxide has pores with 20 vol % or more of a combined volume of the pores being composed of pores of diameter 60 .ANG. or greater. Next, a given amount of alkali is gradually added to suspension including the fine-grained nickel hydroxide and dissolved cobalt compound so that cobalt hydroxide is precipitated on the external surface of the fine-grained nickel hydroxide. The fine-grained nickel electrode active material is produced in the above mentioned way. Each of the fine-grained nickel electrode active material comprises a nickel hydroxide and cobalt oxide having distorted crystal structure and oxidation number higher than +2. The nickel hydroxide has pores whose diameters are 60 .ANG. or greater. And the volume of such pores amounts to 20 vol % or more of the combined volume of all of the pores.

REFERENCES:
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Derwent abstract for and figure from WO91/20101--Blanchard et al. Dec. 26, 1991.
CAS abstract for JP 04109557 --Tamagawa et al. Apr. 10, 1992.
CAS abstract for DE 3806943 Sep. 15, 1988.
Ezhov et al., Structure Modification and Change of Electrochemical Activity of Nickel Hydroxides, J. Electrochem. Soc., 138(4), Apr. 1991.

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