合金的电化学贮氢动力学性能是其应用于动力电池的重要因素.为了提高RE-Mg-Ni系A2B7型贮氢合金的动力学性能,用M (M=Pr,Zr)部分替代La,并采用快淬处理制备了La0.65M0.1Mg0.25Ni3.2Co0.2Al0.1 (M=Pr,Zr)电极合金.研究了元素替代和快淬处理对合金结构及电化学贮氢动力学性能的影响.XRD及TEM结果显示,铸态及快淬态合金均为多相结构,包含(La,Mg)2Ni7和LaNi5主相以及少量的残余相LaNi2.Pr替代快淬态合金为纳米晶结构,而Zr替代快淬态合金为类非晶结构,说明Zr部分替代La促进了非晶的形成.电化学测试表明合金的高倍率放电性能(HRD)随着快淬速度的增加先增大后减小.此外,电化学阻抗谱(EIS),塔菲尔极化曲线以及电势阶跃测试均表明合金的电化学动力学性能随着快淬速度的增加先增大后减小.
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