Ni对复合储氢合金电化学性能的影响

Study on Influence of Ni Addition on Electrochemical Performance of Composite Hydroge Storage Alloy

采用二步重熔法制备了Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/5%Mg2Ni复合材料。通过电池程控测试仪测定了Ni添加对复合储氢合金Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/5%Mg2Ni电化学性能的影响。结果表明,添加Ni粉的合金电极经两个循环就可达到最大的放电容量,而未添加Ni的储氢合金电极需要13个循环才能够活化;当羟基镍粉由100%增加到200%时,合金的最大放电容量增幅分别达到7%、11.8%;在大电流放电试验中,添加Ni粉的合金电极呈良好的高倍率放电性能。

Mmo3 Ml0.7Ni3.55Co0.75Mn0.4dM0.5%Mg2Ni composite was prepared by secondary remelting. The influence of Ni addition on the electrochemical performance of the composite was determined by battery instrument. The results show that the alloy electrode with Ni can reach the maximum discharge capacity after two loops, but the alloy electrode without Ni can activate after 13 loops. The maximum capacity is improved by 7% and 11.8%, respectively, with Ni content increasing from 100% to 200%. The alloy electrode with Ni shows a better high rate discharge ability in the discharging test under high current.