快淬对低钴贮氢合金的电化学性能影响

Effects of Melt-Spun on the Electrochemical Properties of Low-Co Hydrogen Storage Alloy

为改善低钴贮氢合金的综合电化学性能,对其进行不同速度的快淬处理。结果表明:合适的快淬速度不仅可以大幅度的提高放电容量,而且明显的改善合金的循环稳定性和放电电压特性。18m/s快淬低钴合金具有较好的综合电化学性能。但快淬使得合金的活化性能有所降低。利用X射线衍射、扫描电镜对铸态及快淬合金进行微观分析,讨论了快淬对低钴贮氢合金电化学性能的影响机理。

Different-rate rapid quenching was used in the preparation of low-Co AB5 hydrogen storage alloys in order to improve its electrochemical properties. The results show that proper quenching not only increased discharge capacity greatly but also can improved cycle stability and discharge voltage property. Adopting 18 m/s rapid quenching, the alloy can get better electrochemical properties. Mierostructure and phase structure of as-cast and quenched alloys were observed by XRD and SEM. The rapid quenching effects on the electrochemical properties of low-Co hydrogen storage alloy are discussed.