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Ultrafine hydrogen storage powders

United States Patent

6,074,453
June 13, 2000
View the Complete Patent at the US Patent & Trademark Office
Ames Laboratory - Visit the Iowa State University Research Foundation - Office of Intellectual Property & Technology Transfer Website
Ultrafine Hydrogen Storage Powders
A method of making hydrogen storage powder resistant to fracture in service involves forming a melt having the appropriate composition for the hydrogen storage material, such, for example, LaNi.sub.5 and other AB.sub.5 type materials and AB.sub.5+x materials, where x is from about -2.5 to about +2.5, including x=0, and the melt is gas atomized under conditions of melt temperature and atomizing gas pressure to form generally spherical powder particles. The hydrogen storage powder exhibits improved chemcial homogeneity as a result of rapid solidfication from the melt and small particle size that is more resistant to microcracking during hydrogen absorption/desorption cycling. A hydrogen storage component, such as an electrode for a battery or electrochemical fuel cell, made from the gas atomized hydrogen storage material is resistant to hydrogen degradation upon hydrogen absorption/desorption that occurs for example, during charging/discharging of a battery. Such hydrogen storage components can be made by consolidating and optionally sintering the gas atomized hydrogen storage powder or alternately by shaping the gas atomized powder and a suitable binder to a desired configuration in a mold or die.
Anderson; Iver E. (Ames, IA), Ellis; Timothy W. (Doylestown, PA), Pecharsky; Vitalij K. (Ames, IA), Ting; Jason (Ames, IA), Terpstra; Robert (Ames, IA), Bowman; Robert C. (La Mesa, CA), Witham; Charles K. (Pasadena, CA), Fultz; Brent T. (Pasadena, CA), Bugga; Ratnakumar V. (Arcadia, CA)
Iowa State University Research Foundation, Inc. (Ames, IA), California Institute of Technology (Pasadena, CA)
08/ 959,167
October 28, 1997
CONTRACTURAL ORIGIN OF THE INVENTION The United States Government has rights in this invention pursuant to Contract No. W-7405-Eng-82 between the Department of Energy and Iowa State University.