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:
Jul. 01, 2008
Filed:
Apr. 02, 2004
Michael A. Fetcenko, Rochester, MI (US);
Kwo Young, Troy, MI (US);
Stanford R. Ovshinsky, Bloomfield Hills, MI (US);
Taihei Ouchi, Rochester, MI (US);
Michael A. Fetcenko, Rochester, MI (US);
Kwo Young, Troy, MI (US);
Stanford R. Ovshinsky, Bloomfield Hills, MI (US);
Taihei Ouchi, Rochester, MI (US);
Ovonic Battery Company, Inc., Rochester Hills, MI (US);
Abstract
Electrochemical and gas phase hydrogen storage alloy compositions that provide superior performance, especially at low temperature, and excellent cycle life characteristics. The alloys of this invention are ABtype alloys that include a cycle life enhancement element and a low Co concentration. The preferred cycle life enhancement elements include Zr and Si. The cycle life enhancement elements increase the cycle life of the instant alloys by reducing the pulverization of alloy particles upon repeated cycles of charging-discharging or hydriding-dehydriding. The alloys are characterized by low hysteresis on cycling, where hysteresis is measured in terms of mass concentration difference, a parameter related to the activation energy associated with the incorporation of hydrogen into the alloy. The instant alloys are designed to have a low activation energy for hydrogen incorporation and as a result, provide low hysteresis and a more uniform concentration of absorbed hydrogen within the material. As a result, differential lattice expansion effects associated with the absorption of hydrogen are minimized and the tendency for particle pulverization on cycling is minimized. Alloys having a low Co concentration and long cycle life are thus provided for.