快淬纳米晶/非晶Mg2Ni1-xMnx(x=0～0.4)合金电极的电化学性能

功能材料, 2011, 42(4): 593-597.

快淬纳米晶/非晶Mg2Ni1-xMnx(x=0～0.4)合金电极的电化学性能

张羊换 ^1, , 祁焱 ^2, , 侯忠辉 ^3, , 李霞 ^4, , 张国芳 ^5, , 郭世海 ^6,

1.钢铁研究总院,功能材料研究所,北京,100081;内蒙古科技大学材料学院,内蒙古,包头,014010

2.钢铁研究总院,功能材料研究所,北京,100081;内蒙古科技大学材料学院,内蒙古,包头,014010

3.内蒙古科技大学材料学院,内蒙古,包头,014010

4.钢铁研究总院,功能材料研究所,北京,100081;内蒙古科技大学材料学院,内蒙古,包头,014010

5.钢铁研究总院,功能材料研究所,北京,100081;内蒙古科技大学材料学院,内蒙古,包头,014010

6.钢铁研究总院,功能材料研究所,北京,100081

基金项目: 内蒙古高等教育科学研究资助项目(NJzy08071) 内蒙古自然科学基金重点资助项目(200711020703) 国家自然科学基金资助项目(50871050;50701011)

关键词： Mg2Ni型合金 , 快淬 , Mn替代Ni , 电化学贮氢

Electrochemical characteristics of nanocrystalline and amorphous Mg2Ni1-xMnx (x=0-0.4) alloy electrodes prepared by melt-spinning

用快淬工艺制备了纳米晶和非晶Mg2Ni型Mg2Ni1-xMnx(x=0、0.1、0.2、0.3、0.4)合金,获得长度连续,厚度约为30μm,宽度约为25mm的薄带.用XRD、HRTEM分析了快淬合金薄带的微观结构,测试了合金薄带的电化学性能及电化学交流阻抗谱(EIS),测试了电位阶跃后的阳极电流-时间相应曲线,并计算了氢在合金中的扩散系数(D).结果表明,快淬无Mn合金均具有典型的纳米晶结构,而快淬含Mn(x=0.4)合金显示了纳米晶和非晶结构,这证实Mn替代Ni有利于Mg2Ni型合金形成非晶相.Mn替代Ni及快淬处理显著地改善了合金的电化学贮氢性能,包括放电容量和电化学循环稳定性.合金的高倍率放电能力(HRD)随淬速的增加而单调上升,但随Mn替代量的变化HRD具有极大值.

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