The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2011
Filed:
Feb. 04, 2009
Mingming Geng, San Diego, CA (US);
Samaresh Mohanta, San Diego, CA (US);
Jeffrey Phillips, La Jolla, CA (US);
Zeiad M. Muntasser, San Diego, CA (US);
Jeff Barton, San Diego, CA (US);
Mingming Geng, San Diego, CA (US);
Samaresh Mohanta, San Diego, CA (US);
Jeffrey Phillips, La Jolla, CA (US);
Zeiad M. Muntasser, San Diego, CA (US);
Jeff Barton, San Diego, CA (US);
PowerGenix Systems, Inc., San Diego, CA (US);
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.