Electrochemical properties of the ball-milled La1.8Ca0.2Mg14Ni3+xwt%Ni composites (x=0, 50, 100 and 200)

被引：45

作者：

Chen, Y

Sequeirab, C

Chen, CP ^{[1
]}

Wang, QD

机构：

[1] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Peoples R China

[2] Inst Super Tecn, Dept Chem Engn, P-1049001 Lisbon, Portugal

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2003年 / 354卷 / 1-2期

关键词：

hydrogen absorbing materials; electrode materials; composite materials; mechanical alloying; electrochemical reactions;

D O I：

10.1016/S0925-8388(02)01343-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The electrochemical characteristics of the as-cast and ball-milled La2Mg17 type alloy La1.8Ca0.2Mg14Ni3 + xwt%Ni (x=0, 50, 100 and 200) were investigated. After 50 h ball-milling the amorphous La1.8Ca0.2Mg14Ni3 + 100wt%Ni composite exhibited a large discharge capacity of 1004 mAh g (La1.8Ca0.2Mg14Ni3)(-1) at 298 K. Compared with the as-cast La1.8Ca0.2Mg14Ni3 alloy, the remarkable improvement in electrochemical capacity of the ball-milled composite is due to the formation of an amorphous composite. The addition of Ni is an important factor for the earlier formation of an amorphous alloy. The cycling degradation of the composite is influenced by the degree of amorphorization and the amount of Ni added. (C) 2002 Elsevier Science B.V. All rights reserved.

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页码：120 / 123

页数：4

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