球磨MgNi非晶储氢合金电化学性能的研究

Effect of the Milling Parameters on the Electrochemical Properties of Milled Amorphous MgNi Hydrogen Storage Alloy

采用机械合金化法,制备了MgNi非晶储氢合金。探讨了球磨生成非晶的机制。用SEM和XRD分析了合金的表面形貌和相组成。研究不同的球磨工艺如球料比、球径配比、转速以及球磨时间对合金电极电化学性能的影响。所制备的MgNi非晶合金电极的放电容量最高为450mAh/g,但是容量衰减较快。

Amorphous MgNi hydrogen storage alloy was synthesized by mechanically alloying （MA） with the proper milling parameters. The mechanism of amorphous formation by milling was discussed. The surface morphology and phases were analyzed by SEM and XRD. The effect of different parameters such as the mass ratio of ball to powder, the number and size of the balls, and the milling rate and time on electrochemical properties was tested. The maximum discharge capacity of the prepared amorphous MgNi alloy electrode was 450 mAh/g, but the capacity deteriorated fast.