Abstract
A new low cobalt hydrogen storage electrode alloys La 1 − x Ca x Ni 3.2Co 0.3Al 0.3 (0 ≤ x ≤ 0.4) was developed. The microstructure and electrochemical properties were investigated and the results showed that the prepared alloys were basically composed of LaNi 5 as matrix phase and LaNi 3 as second phase ( x ≤ 0.1). The second phase LaNi 3 is substituted by a new phase Al(NiCo) 3 gradually with increasing Ca content, and cycle stability is improved correspondingly. The highest discharge capacity can reach to 295 mAh g −1 ( x = 0.2) and it can remain 82.5% ( x = 0.2) after 300 charge/discharge cycles.
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