For the commercial AB5-type electrode alloys, cobalt is a key element in improving the cyclic stability of electrodes, however the cobalt is very expensive and shares the 40~50% of the total cost of alloys, so the research and development of low-Co or Co-free alloy has been the focus of the study on AB5-type alloys and the focus of industrialization. It is regretful that the electrochemical properties of low-Co or Co-free AB5-type alloys, especial for the cyclic stability, haven't been improved satisfactorily unit now.
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