Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7738063 | Journal of Power Sources | 2014 | 8 Pages |
Abstract
Failure modes of a V-containing and a V-free AB2 Laves phase-based metal hydride alloy were studied by the combination of X-ray diffractometer, scanning electron microscope, X-ray energy dispersive spectroscopy, inductively coupled plasma, Soxhlet extraction, and magnetic susceptibility measurement. Cells with the V-containing alloy exhibited less capacity degradation up until venting occurred in the cells, after which the capacity rapidly degraded. Cells with the V-free alloy remained linear in capacity degradation throughout the cycle life test. The failure mechanism for the V-containing alloy is related to the formation of an oxide layer that penetrates deeper into the alloy particles due to high V leaching and impedes gas recombination, while the failure mechanism for the V-free alloy is related to the continuous pulverization of the main AB2 phase.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
K. Young, D.F. Wong, S. Yasuoka, J. Ishida, J. Nei, J. Koch,