(浙江大學(xué) 材料科學(xué)與工程系， 杭州 310027)
摘 要: 表面包覆是一種表面改性方法，對于提高貯氫合金表面活性，防止氧化和抑制容量衰退都有較積極的作用。探索了以球磨方法對二元非晶合金Mg50Ni50和三元非晶合金Mg(50-x ) Tix Ni50(x＝5，10，15)進(jìn)行表面包覆的工藝及其對合金電極充放電循環(huán)穩(wěn)定性的影響。結(jié)果表明：Y，Al，Ni 等包覆元素皆可在一定程度上延緩非晶合金Mg50Ni50較快的循環(huán)容量衰退，而且Ni對Mg(50-x )Tix Ni50(x＝5，10，15)合金的包覆可有效地提高其循環(huán)穩(wěn)定性。
關(guān)鍵字: 表面包覆； 鎂基貯氫電極； 循環(huán)穩(wěn)定性
of Mg-based hydrogen storage electrodes
LEI Yong-quan， WANG Qi-Dong
（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
