硼对Mm(Ni,Co,Mn,Al)_5贮氢合金性能的影响

Effect of boron on the performance of Mm(Ni,Co,Mn,Al)_5 hydrogen storage alloys

在低钴AB5型贮氢合金MmNi3 8Co0 4Mn0 6Al0 2 中加入微量硼 ,用铸造和快淬工艺制备了MmNi3 8Co0 4Mn0 6Al0 2 Bx(x =0 ,0 1,0 2 ,0 3 ,0 4)贮氢合金 ;测试了合金的电化学性能 ;研究了硼含量对合金初始活化及高倍率放电性能的影响。结果表明 :微量硼使合金性能大幅度提高。当x从 0增加到 0 4时 ,合金经过 1～ 5次循环就可完全活化 ,铸态合金的1C倍率放电能力从 89 0 2 %增加到 93 61% ,3 8m/s快淬态合金的 1C倍率放电能力从 79 62 %提高到 89 82 %。

Hydrogen storage (alloys Mm)Ni_(3.8)Co_(0.4)Mn_(0.6)Al_(0.2)B_ x ( x =0, 0.1,0.2,0.3, 0.4) were prepared by addition of boron in low-Co AB_5 type MmNi_(3.8)Co_(0.4)Mn_(0.6)Al_(0.2) hydrogen storage alloy and cast and rapid quenching. The electrochemical performance of the alloys was measured.The effects of boron on the activation performance andhigh rate discharge capability of the alloys were investigated.The results showed that the performance of the alloys could be enhanced significantly by the addition of a trace of boron.When x was increased from 0 to 0.4, the alloys could be fully activated through 1～5 charge-discharge cycles and the 1 C rate discharge capability of as-cast alloys was increased from 89.02% to 93.61% and from 79.62% to 89.82% for as-quenched alloys obtained with a quenching rate of 38m/s.