(浙江大学 材料科学与工程系， 杭州 310027)
摘 要: 表面包覆是一种表面改性方法，对于提高贮氢合金表面活性，防止氧化和抑制容量衰退都有较积极的作用。探索了以球磨方法对二元非晶合金Mg50Ni50和三元非晶合金Mg(50-x ) Tix Ni50(x＝5，10，15)进行表面包覆的工艺及其对合金电极充放电循环稳定性的影响。结果表明：Y，Al，Ni 等包覆元素皆可在一定程度上延缓非晶合金Mg50Ni50较快的循环容量衰退，而且Ni对Mg(50-x )Tix Ni50(x＝5，10，15)合金的包覆可有效地提高其循环稳定性。
关键字: 表面包覆； 镁基贮氢电极； 循环稳定性
of Mg-based hydrogen storage electrodes
（Department of Materials Science and Engineering，
Zhejiang University， Hangzhou 310027， P.R.China）
Abstract: Surface coating is a kind of surface modification， which plays positive roles in improving the surface activation of hydrogen storage alloys， protecting alloys from oxidation and depressing the capacity degradation. The technology of coating on binary Mg50Ni50 and ternary Mg(50-x )Tix Ni50 (x＝5，10，15)， and its effect on alloys cycle stability were also reported. The research indicated that the coating of elemental Y，Al and Ni all retard the rapid capacity degradation of amorphous Mg50Ni50 to some degree，and the coating with Ni can effectively improve the cycle stability of Mg(50-x)Tix Ni50 (x ＝ 5，10，15) electrodes. The mechanical alloying (MA) technology and the phase structure transformation during the process of MA were discussed.
Key words: surface coating； Mg-based hydrogen storage electrodes； cycle stability
