Journal
JOURNAL OF POWER SOURCES
Volume 141, Issue 1, Pages 193-197Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2004.09.010
Keywords
nickel metal-hydride battery; hybrid electric vehicle; deterioration mechanism
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The deterioration mechanism of nickel metal-hybrid batteries for hybrid electric vehicles (HEVs) has been investigated. For HEV use, the deterioration of the batteries is caused by the degradation of the positive electrode which is influenced by the migration of the constituent elements of the negative electrode alloy as well as by the oxidation of the negative electrode. Based on the elucidated deterioration mechanism, the degradation of the positive electrode has been suppressed by employing a hydrogen-absorbing alloy with higher oxidation resistibility for the negative electrode, prolonging the cycle life of nickel metal-hydride batteries for HEVs. (C) 2004 Elsevier B.V. All rights reserved.
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