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将Mm(NiCoMnAl)5合金与CNTs均匀混合后机械球磨制备Mm(NiCoMnAl)5/10wt.%CNTs复合储氢合金.用X射线衍射(XRD)、扫描电镜(SEM)和电化学测试方法研究复合合金的结构和电化学性能.结果表明:Mm(NiCoMnAl)5/10wt.%CNTs复合合金主要具有CaCu5结构,在其表面键合了众多的CNTs.随球磨时间增大,复合合金中CNTs含量逐渐减少.复合合金的最大放电容量、循环稳定性和高倍率放电性能随球磨时间的增大呈现出先增大后减小的变化规律,其中球磨时间为5h时,最大放电容量达到最大值291.9mAh/g;当球磨时间为3h时,合金电极经60次充放电循环后的容量保持率高达91.2%,且具有最佳的高倍率放电性能.
Mm (NiCoMnAl) 5 / 10wt.% CNTs composite hydrogen storage alloy was prepared by mechanical milling of Mm (NiCoMnAl) 5 alloy and CNTs uniformly. The properties of the composite were studied by XRD, SEM and electrochemical test The results show that the Mm (NiCoMnAl) 5 / 10wt.% CNTs composite alloy mainly has CaCu5 structure and a large number of CNTs are bonded to its surface. With the increase of milling time, the content of CNTs in the alloy gradually increases Decreases.The maximum discharge capacity, cycle stability and high rate discharge performance of composite alloy increase first and then decrease with the increase of ball milling time.The maximum discharge capacity reaches 291.9mAh / g; when the ball milling time is 3h, the capacity retention rate of the alloy electrode reaches to 91.2% after 60 charge-discharge cycles, and has the best high-rate discharge performance.