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 {minus}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 chemical homogeneity as a result of rapid solidification 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.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 20075861
- Resource Relation:
- Other Information: PBD: 13 Jun 2000
- Country of Publication:
- United States
- Language:
- English
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Benefits of rapid solidification processing of modified LaNi{sub 5} alloys by high pressure gas atomization for battery applications
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