Electrochemical properties of AB5-type hydride-forming compounds prepared by mechanical alloying

摘要: Abstract Two types of intermetallic compounds, LaNi 4 M with M=Mn, Co, Cu and Al polysubstituted alloys Mm(NiAlMnCo) 5 Mm=Mischmetal were synthesized by mechanical alloying. In most cases, 10 h grinding was sufficient to obtain single phase crystallites about 6 nm particles ranging between 80 mm in diameter. The MmNi 3.6 0.35 Mn 0.25 Co 0.8 alloys, once removed from the container, found present an electrochemical capacity 159 mA h/g. Such a increased 216.3, 241.7 273.5 h/g post-anneal step under vacuum temperatures 673, 873 1073 K, respectively. various depends on both surface states internal strains sample so that heat treatments release these enhance capacity.