Phase Structure and Electrochemical Properties of Melt-Spun La4MgNi17.5Mn1.5 Hydrogen Storage Alloys

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2017,（11）
• 页码范围: 1033-1039
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s40195-017-0577-4

摘要

The (La4MgNi17.5Mn1.5) alloys at different melt-spun speeds were prepared by using a vacuum melt-spun furnace,and the phase structure and electrochemical properties of alloys were studied.X-ray diffraction analysis results show that melt-spun La4MgNi17.5Mn1.5 alloys are composed of CeCus-type,Pr5Co19-type and CeNi2-type phase.As the melt-spun speed increased,the phase abundance of CeCu5-type increased,but that of Pr5Co19-type decreased.Scanning electron microscopy-energy-dispersive spectroscopy analysis results show that melt-spun treatment can refine grain and make the alloys homogenization.Electrochemical tests show that all alloys have good activation performance within four cycles.With the increase in melt-spun speed,the cycle stability (S) of the alloys was improved obviously.After 100 cycles,the retention rate (S100) of the alloy increased from 54.82％ (as-cast) to 82.29％ (25 m/s).Nevertheless,the maximum discharge capacity (Cmax) and high-rate dischargeability gradually decreased.