The self-discharge mechanism of AB5-type hydride electrodes in Ni/MH batteries

被引：29
作者：
Wang, CS [1 ]
Marrero-Rivera, M
Serafini, DA
Baricuatro, JH
Soriaga, MR
Srinivasan, S
机构：
[1] Tennessee Technol Univ, Ctr Mfg Res, Cookeville, TN 38505 USA
[2] Tennessee Technol Univ, Dept Chem Engn, Cookeville, TN 38505 USA
[3] Texas A&M Univ, Dept Chem, College Stn, TX 77843 USA
[4] Princeton Univ, Ctr Energy & Environm Studies, Princeton, NJ 08544 USA
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2006年 / 31卷 / 05期
关键词：
Ni-metal-hydride batteries; metal-hydride electrodes; hydrogen storage; phase transformation; self-discharge;
D O I：
10.1016/j.ijhydene.2005.06.001
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 new strategy in the study of the self-discharge mechanism of metal-hydride electrodes has been developed. The self-discharge behavior of a LaNi3.55Co0.75Mn0.4Al0.3 electrode in alkaline solution, with and without ZnO additive, was investigated. Experimental results showed that the self-discharge rate (hydrogen desorption) within the single-phase region is controlled by the difference between the equilibrium hydrogen partial pressure at the electrode and the actual hydrogen partial pressure in the cell. Dissolved oxygen was also found to exert a strong influence on the self-discharge rate in the single-phase region. In the two-phase region, the self-discharge is limited by the rate of phase transformation. A four-step mechanism for the self-discharge process is proposed. (c) 2005 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：603 / 611
页数：9
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