Chemistry: electrical current producing apparatus – product – and – Current producing cell – elements – subcombinations and... – Electrode
Reexamination Certificate
2006-04-18
2006-04-18
Crepeau, Jonathan (Department: 1746)
Chemistry: electrical current producing apparatus, product, and
Current producing cell, elements, subcombinations and...
Electrode
C423S594190
Reexamination Certificate
active
07029791
ABSTRACT:
A high capacity alkaline storage battery which exhibits a maintained dischargeability and a reduced excess negative electrode capacity by decreasing the content of γ-NiOOH left in higher order positive active material. To an aqueous solution of a mixture of nickel sulfate, zinc sulfate and cobalt sulfate was gradually added an aqueous solution of sodium hydroxide with stirring to cause the crystallization of nickel hydroxide. Nickel hydroxide thus crystallized was washed, dehydrated, and then dried. To nickel hydroxide was then added dropwise a predetermined amount of an oxidizing agent (NaClO) while being stirred in an aqueous solution of sodium hydroxide which had been kept to a predetermined temperature so that nickel hydroxide as a main component was put in higher order (e.g., average valence is raised to 2.8) Subsequently, to the material was added dropwise a predetermined amount of a reducing agent (H2O2) so that the higher order nickel hydroxide as a main component was reduced (e.g., average valence is lowered to 2.2). Nickel hydroxide was washed, dehydrated, and then dried to obtain a higher order nickel hydroxide active material (positive active material).
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patent: 6333126 (2001-12-01), Maruta
patent: 6576368 (2003-06-01), Ogasawara et al.
patent: 2765008 (1998-04-01), None
patent: 11-144723 (1999-05-01), None
Baba Yoshitaka
Kihara Masaru
Crepeau Jonathan
Sanyo Electric Co,. Ltd.
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