Effects of carbon crystallinity on hydriding-dehydriding and charge-discharge characteristics of MgNi alloy-carbon material composites

被引：3

作者：

Iwakura, C ^{[1
]}

Inoue, H ^{[1
]}

Furukawa, N ^{[1
]}

Nohara, S ^{[1
]}

机构：

[1] Univ Osaka Prefecture, Grad Sch Engn, Dept Appl Chem, Sakai, Osaka 5998531, Japan

来源：

MATERIALS TRANSACTIONS | 2002年 / 43卷 / 11期

关键词：

MgNi alloy; amorphous; nickel-metal hydride battery; surface modification; carbon material;

D O I：

10.2320/matertrans.43.2706

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hydriding-dehydriding and charge-discharge characteristics of amorphous MgNi alloys modified by ball-milling with different carbon materials were investigated with the intention of using them in nickel-metal hydride batteries. It was found that the ball-milling with carbon materials markedly improved hydriding-dehydriding and charge-discharge characteristics of the MgNi alloy, and an optimum ball-milling time was shortened by utilization of carbon material with lower crystallinity. However, ball-milling for longer than the optimum time led to a decrease in the amount of absorbed hydrogen and the discharge capacity, which was ascribed to the formation of MgNi3C. These results indicate that the characteristics of MgNi alloy-carbon material composites greatly depend on both crystallinity of carbon material used and ball-milling time.

引用

页码：2706 / 2710

页数：5

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