PASTED NICKEL HYDROXIDE ELECTRODE FOR RECHARGEABLE NICKEL-ZINC BATTERIES
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United States of America Patent
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Issued Date -
Jan 26, 2012
app pub date -
Sep 30, 2011
filing date -
Feb 7, 2008
priority date (Note) -
Abandoned
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Abstract
Active material for a positive electrode of a rechargeable alkaline electrochemical cell is made with nickel hydroxide particles or cobalt-coated nickel hydroxide particles treated with strongly oxidizing reagents such as alkali metal persulfate in alkaline solution. The active material also may be made with cobalt-coated nickel hydroxide particles having a high percentage of cobalt(III) on a surface or an average cobalt oxidation state of about 3 measured across the particles. The treated nickel hydroxide or cobalt-coated nickel hydroxide decreases the cobalt solubility in the alkaline electrolyte and increases the high-rate charge and discharge capability. The lower cobalt solubility decreases cobalt migration that can increase self discharge and lead to premature failure.
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