Effects of cycling conditions of active material from discharged Ni positive plates studied by inelastic neutron scattering spectroscopy

Juergen Eckert, Ravi Varma, Lisa Diebolt, Margaret Reid

Research output: Contribution to journalArticle

Abstract

A series of cycled Ni battery plate materials has been examined by means of inelastic neutron scattering spectroscopy in order to determine the nature of the protons in the discharged and cycled material. Our results clearly demonstrate that some amount of the NiOOH phases which form on oxidation does not convert back to β-Ni(OH)2 upon discharging the battery and that this amount increases with the number of cycles the battery undergoes. Moreover, we have identified vibrational signatures of lattice water and found that its amount increases with KOH concentration used in the cell. Since cells operated at higher KOH concentrations are known to fail after fewre cycles, our inelastic neutron scattering studies clearly implicate the irreversible formation of lattice water as one of the main reasons for this failure.

Original languageEnglish
Pages (from-to)1895-1899
Number of pages5
JournalJournal of the Electrochemical Society
Volume144
Issue number6
DOIs
StatePublished - Jun 1997

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