The deterioration behavior of a metal hydride electrode based on the V0.66Ti0.22Ni0.12 alloy

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The deterioration behavior of a V0.66Ti0.22Ni0.12 alloy electrode during charge-discharge cycling in KOH electrolyte and its degradation mechanism were investigated. The alloy electrode was completely deteriorated within 10 cycles. Coating the alloy particles with Ni or Cu improved to some extent the cycle life but the capacity for decay with cycling was still significant. The capacity for loss of the V0.66Ti0.22Ni0.12 alloy electrode with cycling was ascribed to the dissolution of V and Ti (mainly V) from the near-surface region into the electrolyte and the formation of TiO2 layer on the alloy particle surface which resulted in increases of the contact resistance between particles and the reaction resistance on the alloy surface.
Publisher
ELSEVIER SCIENCE SA LAUSANNE
Issue Date
1997-06
Language
English
Article Type
Article
Keywords

HYDROGEN; ABSORPTION; NI; TI

Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.255, no.1-2, pp.248 - 252

ISSN
0925-8388
DOI
10.1016/S0925-8388(96)02813-7
URI
http://hdl.handle.net/10203/67883
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