Effect of partial substitution of La with Ce, Pr and Nd on the properties of LaNi5-based alloy electrodes

被引：28

作者：

Chen, J

Dou, SX

Liu, HK

机构：

[1] Inst. for Mat. Technol. and Mfg., University of Wollongong, Wollongong, NSW 2522, Northfields Avenue

来源：

JOURNAL OF POWER SOURCES | 1996年 / 63卷 / 02期

关键词：

lanthanum-nickel-based alloy; substitution; hydride electrodes;

D O I：

10.1016/S0378-7753(96)02461-5

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：

A comparison is made of the properties of LaB5 (B = Ni3.55Co0.75Mn0.4Al0.3), La0.7R0.3B5 (R = Ce, Pr, Nd) and MmB(5) (Mm is mischmetal in an atomic ratio of La:Ce:Pr:Nd = 0.7:0.2:0.05:0.05) alloy electrodes. X-ray diffraction results reveal that Ce, Pr, Nd substitute for La and decrease the unit cell volume. Pressure-composition isotherms of the electrode alloys are determined by an electrochemical method. The characteristics of the alloy electrodes, including initial activation, high-rate discharge, cycle life and self-discharge, are examined. It is found that partial replacement of La with Ce, Pr, Nd in the LaNi5-based alloy improves greatly the activation, high-rate discharge and cycle life of the electrode, but increases the self-discharge due to a higher dissociation pressure of the metal hydride.

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页码：267 / 270

页数：4

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