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Ni/metal hydride secondary element

United States Patent

April 19, 2005
View the Complete Patent at the US Patent & Trademark Office
A Ni/metal hydride secondary element having a positive nickel hydroxide electrode, a negative electrode having a hydrogen storage alloy, and an alkaline electrolyte, the positive electrode, provided with a three-dimensional metallic conductive structure, also contains an aluminum compound which is soluble in the electrolyte, in addition to nickel hydroxide and cobalt oxide. The aluminum compound is aluminum hydroxide and/or aluminum oxide, and the mass of the aluminum compound which is present in the positive bulk material mixture is 0.1 to 2% by weight relative to the mass of the nickel hydroxide which is present. In combination with aluminum hydroxide or aluminum oxide, the positive electrode further contains lanthanoid oxidic compounds Y.sub.2 O.sub.3, La.sub.2 O.sub.3 and Ca(OH).sub.2, as well as mixtures of these compounds.
Bauerlein; Peter (Lindwedel, DE)
Varta Automotive Systems GmbH (DE)
09/ 909,497
July 20, 2001
The Government of the United States of America has rights in this invention pursuant to cooperative Agreement No. DE-F CO2-95EE 50425 awarded by the U.S. Department of Energy.