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用机械球磨法分别以Ti、B、复合物TiB对非晶态Mg45Ti3V2Ni50储氢合金进行了表面修饰.实验结果表明,恰当比例的TiB球磨修饰对镁基储氢合金循环稳定性远好于Ti、B同比例单独修饰合金电极的效果.Mg45Ti3V2Ni50与TiB质量比为2∶1的Mg45Ti3V2Ni50-TiB(2∶1)复合合金电极的初始放电容量为529.4mAh·g-1,第50次循环放电容量仍为277.1mAh·g-1.复合物TiB中Ti、B元素之间和复合合金中合金元素与TiB之间产生了金属与非金属的协同作用,导致复合合金新的立体褶皱结构的生成,增强了修饰层与合金间的作用,Mg45Ti3V2Ni50-TiB(2∶1)合金电极表面活性增强,循环稳定性显著提高.
The surface modification of amorphous Mg45Ti3V2Ni50 hydrogen storage alloy with Ti, B and TiB was carried out by mechanical ball milling.The experimental results show that the cycling stability of Mg-based hydrogen storage alloy with TiB ball milling modification is much better than Ti, B alloy modified with the same proportion of the effect.Mg45Ti3V2Ni50 and TiB mass ratio of 2: 1 Mg45Ti3V2Ni50-TiB (2: 1) composite electrode initial discharge capacity of 529.4mAh · g-1, the 50th cycle discharge capacity is still Was 277.1mAh · g-1. The synergistic effect of metal and non-metal between Ti and B elements and TiB in the TiB composites resulted in the formation and enhancement of a new three-dimensional folded structure of the composite alloy The interaction between the modified layer and the alloy increases the surface activity of the Mg45Ti3V2Ni50-TiB (2: 1) alloy electrode and significantly improves the cycle stability.