球磨对Mg_(22)Y_(2)Ni_(10)Cu_(2)+50%Ni复合材料电化学性能的影响  

Effect of ball milling on structure and electrochemical properties of Mg_(22)Y_(2)Ni_(10)Cu_(2)+50%Ni composite

作　　者：赵凤光[1] 贾凯波 孙昊[1] ZHAO Fengguang;JIA Kaibo;SUN Hao(Materials and Metallurgy School, Inner Mongolia University of Science and Technology, Baotou 014010, China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《内蒙古科技大学学报》2021年第3期240-245,共6页Journal of Inner Mongolia University of Science and Technology

基　　金：内蒙古自治区自然科学基金资助项目(2018LH05003);内蒙古高校研究基金资助项目(NJ2218142).

摘　　要：将通过真空冶炼获得的Mg_(22)Y_(2)Ni_(10)Cu_(2)合金与其自身质量分数50%的Ni粉混合后,分别进行了10,20,30和40 h的球磨.之后,研究了球磨时间对复合材料的结构和电化学储氢性能的影响.结果表明:经过10 h球磨后,材料Mg_(2)Ni,Mg,YMgNi_(4)相,以及添加的单质Ni构成;随着球磨时间的延长,XRD的衍射峰明显减弱,复合材料的晶粒明显细化,甚至形成了纳米晶以及非晶组织.电化学性能测试结果表明:随着球磨时间的延长,材料的放电比容量逐渐增加,球磨40 h时材料最大放电比容量达到了423.2 mAh/g,同时球磨能够明显改善合金的动力学性能,球磨40 h的合金具有较好的高倍率放电性能、较小的电极电荷转移阻力和较大的极限电流密度.但球磨过程弱化了合金的循环稳定性.Mg_(22)Y_(2)Ni_(10)Cu_(2) alloy obtained by vacuum smelting was mixed with Ni powder by 50%mass fraction of the alloy,and the composite was milled for 10,20,30 and 40 h.The effect of milling time on the electrochemical properties of the composites was studied.The results showed that after 10 h ball milling,Mg_(2)Ni,Mg,YMgNi_(4) phases and the added Ni were mainly included in the material.With the extension of milling time,the diffraction peak of XRD was obviously weakened.At this time,SEM and TEM results showed that the grain size of the material was refined obviously,even with the nanocrystalline and amorphous structure formed.The electrochemical performance test showed that the discharge specific capacity of the material increased with the milling time,and the maximum discharge specific capacity reached 423.2 mAh/g at the milling time of 40 h.Meanwhile,ball milling can significantly improve the dynamic properties of the alloy.It is concluded that the alloy milled for 40 h has better discharge performance,lower electrode charge transfer resistance and larger limiting current density.However,the cycle stability of the alloy is weakened by ball milling.

关 键 词：Mg_(22)Y_(2)Ni_(10)Cu_(2) 球磨 电化学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]