Effects of annealing and NaOH pretreatment on an LmNi3.65Al 0.34Mn0.27Co0.74 hydrogen storage alloy
Journal
Journal of Alloys and Compounds
Journal Volume
358
Journal Issue
1-2
Pages
281-287
Date Issued
2003
Author(s)
Abstract
Hydrogen storage alloys based on mischmetal (Lm = La-rich) are commercially used as negative electrode materials for Ni-MH batteries. In this paper, the effects of annealing and NaOH treatment on the LmNi 3.65Al0.34Mn0.27Co0.74 alloys are investigated. Experimental results reveal that the annealing of the LmNi 3.65Al0.34Mn0.27Co0.74 alloy will reduce the pulverization and raise the resistance of volume expansion during hydrogen absorption, and hence improve the alloy's cycle stability and electrochemical properties. The NaOH treatment of the LmNi3.65Al 0.34Mn0.27Co0.74 alloy produces a porous surface with enriched Ni, Co and Na atoms, which will enhance the electrocatalytic activity and inhibit the oxidation and pulverization of the alloy electrode. Hence, the NaOH treated electrode can exhibit an improved charge/discharge efficiency in Ni-MH batteries. © 2003 Elsevier B.V. All rights reserved.
SDGs
Type
journal article