Abstract
In this work, three Mm(Ni-Co-Mn-Al)(5) alloys with the same formula were produced by vacuum induction melting and casted at different cooling rates: normal cooling, fast cooling, rapid quenching. In addition, a portion of the rapidly quenched alloy was annealed. The crystallographic and structural properties and the electrochemical performance of these materials were characterized. For all the as-cast alloys, cooling rate did not significantly affect their activation process and cycle life. In contrast, the alloy, which was rapidly quenched and then annealed, displayed a longer cycle life. However, it required a long activation process to achieve its maximum capacity. The effects of metallurgical processes on the sealed cell. performance such as cycle life, internal gaseous pressure after charging, and storage behavior after formation were also examined. (C) 1999 Elsevier Science S.A. All rights reserved.
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