Abstract
In order to further reduce the cost of AB 5 type rare-earth-based hydrogen storage alloy, a low-Co AB 5 type hydrogen storage alloy was prepared by substituting Cr, Si, Cu for Co and adjusting of the composition. The result showed that the effect of the three kinds of substituting elements on cycle life increased in the sequence Si>Cr>Cu; and on the discharge capacity in the sequence Cu>Cr>Si. An overall favorable effect becomes possible by adding small quantities of Cr, Cu, Si. The discharge capacity and activation property as well as rate discharge capability of low-Co mischmetal based hydrogen storage electrode alloy reached the requirements of practical use when applying nonstoichiometric compositions.
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