Electrochemical reduction of La(Ni3.6Co0.7Al0.4Mn0.3) (LaMM) deuterides investigated by in situ neutron powder diffraction: Following the metal-hydride phase transition under technical operating conditions in a KOD electrolyte

Schefer, J.; Keller, L.; Zannatul, Y.; Paofai, Serge; Schmalz, Michael J.; Krebs, Martin; Ceretti, Monica; Paulus, Werner

doi:10.1016/j.ijhydene.2013.01.186

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“…The use of in situ diffraction techniques to study phase transitions in intermetallic compounds during charge/discharge has been extensively investigated by Latroche and co-workers [27][28][29][30][31][32] and others. 33,34 The reaction mechanism may vary greatly depending on the alloy composition and electrode cycling conditions. For instance, in MmNi 4.3-x Mn 0.3 Al 0.4 Co x (x 5 0.36 and 0.69) 30 where Mm refers to mischmetal, the appearance of an intermediate c phase was observed for the alloy x 5 0.69 in addition to the fully charged b phase.…”

Section: 12mentioning

confidence: 99%

In situ investigation of commercial Ni(OH)₂and LaNi₅-based electrodes by neutron powder diffraction

et al. 2014

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Electrochemical reactions at both positive and negative electrodes in a nickel metal hydride (Ni-MH) battery during charge have been investigated by in situ neutron powder diffraction. Commercially available b-Ni(OH) 2 and LaNi 5 -based powders were used in this experiment as positive and negative electrodes, respectively. Exchange of hydrogen by deuterium for the b-Ni(OH) 2 electrode was achieved by ex situ cycling of the cell prior to in situ measurements. Neutron diffraction data collected in situ show that the largest amount of deuterium contained at the positive electrode is de-intercalated from the electrode with no phase transformation involved up to ;100 mA h/g and, in addition, the 110 peak width for the positive electrode increases on charge. The negative electrode of composition MmNi 3.6 Al 0.4 Mn 0.3 Co 0.7 , where Mm 5 Mischmetal, exhibits a phase transformation to an intermediate hydride c phase first and then to the b phase on charge. Unit cell dimensions and phase fractions have been investigated by Rietveld refinement of the crystal structure.

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Section: 12mentioning

confidence: 99%

In situ investigation of commercial Ni(OH)₂and LaNi₅-based electrodes by neutron powder diffraction

et al. 2014

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Electrochemical reduction of La(Ni3.6Co0.7Al0.4Mn0.3) (LaMM) deuterides investigated by in situ neutron powder diffraction: Following the metal-hydride phase transition under technical operating conditions in a KOD electrolyte

Cited by 1 publication

References 39 publications

In situ investigation of commercial Ni(OH)₂and LaNi₅-based electrodes by neutron powder diffraction

In situ investigation of commercial Ni(OH)₂and LaNi₅-based electrodes by neutron powder diffraction

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Electrochemical reduction of La(Ni3.6Co0.7Al0.4Mn0.3) (LaMM) deuterides investigated by in situ neutron powder diffraction: Following the metal-hydride phase transition under technical operating conditions in a KOD electrolyte

Cited by 1 publication

References 39 publications

In situ investigation of commercial Ni(OH)2and LaNi5-based electrodes by neutron powder diffraction

In situ investigation of commercial Ni(OH)2and LaNi5-based electrodes by neutron powder diffraction

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In situ investigation of commercial Ni(OH)₂and LaNi₅-based electrodes by neutron powder diffraction

In situ investigation of commercial Ni(OH)₂and LaNi₅-based electrodes by neutron powder diffraction