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为获得高性价比的商业化AB5型贮氢合金,研究了以Cu代替部分Co对Mm(NiMnAl-SiFe)4.2-4.7Co0.65-xCux(x≤0.38mol)合金的电化学性能的影响.实验结果表明,Cu添加量为0～0.38mol时,其最大放电比容量Cmax由352.7mA.h/g降至310.9mA.h/g,高倍率放电性能HRD2520由65.82%降至34.13%;合金充放电循环300次,容量保持率S300由81.89%降至62.58%;合金的初始活化次数为2～3次,氢平台区则变窄,吸氢平台压先上升而后下降.Cu添加量为0.10mol时,合金具有较好的性价比:Cmax=333.2mA.h/g,HRD2520=60.27%;容量保持率为80%时,循环寿命为346次;吸氢平台压为0.082MPa,最大吸氢量可达1.00%.
In order to obtain cost-effective AB5-type hydrogen storage alloy, the effect of Cu on the electrochemical performance of Mm (NiMnAl-SiFe) 4.2-4.7Co0.65-xCux (x≤0.38mol) The results showed that the maximum discharge capacity (Cmax) decreased from 352.7mA.h / g to 310.9mA.h / g and the high rate discharge HRD2520 decreased from 65.82% to 34.13% when the amount of Cu was 0 ~ 0.38mol. Discharge cycle 300 times, the capacity retention rate S300 decreased from 81.89% to 62.58%; the initial activation number of the alloy was 2 to 3 times, the hydrogen platform area was narrowed, the hydrogen absorption platform pressure first increased and then decreased .Cu addition amount of 0.10mol , The alloy has good cost performance: Cmax = 333.2mA.h / g, HRD2520 = 60.27%; the cycle life is 346 times when the capacity retention is 80%; the hydrogen absorption platform pressure is 0.082MPa, the maximum hydrogen absorption capacity can be Up to 1.00%.