Effect of surface modification by heating in argon on charge/discharge characteristics of Mg2Ni electrode

被引：2

作者：

Hatano, Y ^{[1
]}

Tachikawa, T ^{[1
]}

Kobayashi, K ^{[1
]}

Mori, K ^{[1
]}

Watanabe, K ^{[1
]}

Morozumi, S ^{[1
]}

机构：

[1] Toyama Univ, Hydrogen Isotope Res Ctr, Toyama 9308555, Japan

来源：

MATERIALS TRANSACTIONS JIM | 1999年 / 40卷 / 09期

关键词：

Mg2Ni; magnesium; surface property; initial activation; evaporation; oxidation; porous metal; electrode; nickel/metal hydride battery;

D O I：

10.2320/matertrans1989.40.919

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Charge/discharge characteristics of Mg,Ni electrodes were examined by focussing attention on the influence of surface modification by heating in argon. The initial activation was significantly easier for the electrodes heated at 550 degrees C than un-heated ones. The surfaces of electrodes became porous by the heating because of the evaporation of magnesium. A MgO layer was formed during the heating. The improvement of charge/discharge characteristics by the heating was ascribed to the increase in the specific surface area and the porosity of the oxide film, and to the formation of MgNi2 and nickel phases which should act as the local reaction sites for hydrogen during the charge and discharge processes.

引用

页码：919 / 922

页数：4

共 12 条

[1]

GREGG SJ, 1958, J I MET, V87, P187

[2]

HATANO Y, 1998, ANN REPT HYDROGEN IS, V18, P105

[3] Surface modification of MgNi alloy with graphite by ball-milling for use in nickel-metal hydride batteries [J].