Abstract
Fine particles of hydrogen storage alloys such as LaNi 5 and MmNi 4.5-Mn 0.5 (Mm misch metal) were encapsulated in a thin layer of copper 1–2 μm thick by means of a special chemical plating method. This treatment prevented further disintegration of the metal and improved the thermal conductivity. The alloy-copper microcapsules, which had dimensions of less than 30 μm, were able to absorb hydrogen easily without special activation and exhibited no decrease in hydrogen storage capacity. Pellets obtained by compressing the microencapsulated powder under a pressure of 5–10 tf cm −2 did not show any visible cracks after 1000 hydrogen sorption cycles.
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