Recycling method of nickel-hydrogen secondary battery

Details Recycling method of nickel-hydrogen secondary battery Recycling method of nickel-hydrogen secondary battery

1998-09-23

2000-06-20

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Having means for draining or removing electrolyte from a...

429 52, 429 49, H01M 236

Patent

active

060776226

ABSTRACT:
A method of recycling a deteriorated nickel-hydrogen battery. Concentrated sulfuric acid containing at least one of Ni ions, Co ions and La ions is poured into the deteriorated nickel-hydrogen battery and the interior thereof is cleaned with the concentrated sulfuric acid. The state of the interior of the battery is maintained at a temperature of 60.+-.10.degree. C., and an electric current is supplied in such a direction as to charge the nickel-hydrogen battery. Then, the interior of the nickel-hydrogen battery is cleaned and filled with an alkali electrolyte containing a reducing agent. Consequently, .gamma.-NiOOH changes to .beta.-NiOOH to restore the capacity of a positive electrode, and Mm(OH).sub.3, Al(OH).sub.3, Mn(OH).sub.2 and CO(OH).sub.2 dissolve in concentrated sulfuric acid to activate the surface of a negative electrode. In addition, the hydrophilic property of the separator is restored.

REFERENCES:
patent: 312340 (1885-02-01), Dun
patent: 1488480 (1924-04-01), Edison

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