Nickel active material for use in alkali storage cells and its m

Details Nickel active material for use in alkali storage cells and its m Nickel active material for use in alkali storage cells and its m

1996-02-12

1997-11-25

Nuzzolillo, M.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429224, 429229, H01M 402

Patent

active

056910860

ABSTRACT:
A nickel active material for an alkali storage cell whose surface is covered with a cobalt compound, wherein the diffusion and permeation into the nickel hydroxide mother particles of cobalt compound during excessive discharging, which act to reduce the active material efficiency and the excessive discharging characteristics, are prevented. This is achieved by having a covering layer, including one or more of the following metal compounds; an aluminum compound, a magnesium compound, an indium compound and a zinc compound, in addition to a cobalt compound, formed on the surface of a mother particle of nickel hydroxide, and by heat treating the covered mother particles in the presence of alkali and oxygen so as to convert the cobalt compound into a compound of cobalt where an oxidization number of cobalt is greater than 2.

REFERENCES:
patent: 5498403 (1996-03-01), Shin
patent: 5506076 (1996-04-01), Miyamoto et al.
patent: 5523182 (1996-06-01), Ovshinsky et al.
Patent Abstracts of Japan, vol.13, No. 496 (E-843), Nov. 9, 1989 & JP-A-01 200555.

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