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In situ investigation of commercial Ni(OH)(2) and LaNi5-based electrodes by neutron powder diffraction
The ISIS Facility, STFC Rutherford Appleton Laboratory, Oxfordshire 11 0QX, United Kingdom; and Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 106 91, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 106 91, Sweden.
Nilar Svenska AB, Gavle 800 08, Sweden.
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2015 (English)In: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 30, no 3, 407-416 p.Article in journal (Refereed) Published
Abstract [en]

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 beta-Ni(OH)(2) and LaNi5-based powders were used in this experiment as positive and negative electrodes, respectively. Exchange of hydrogen by deuterium for the beta-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 similar 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 = Mischmetal, exhibits a phase transformation to an intermediate hydride gamma phase first and then to the beta phase on charge. Unit cell dimensions and phase fractions have been investigated by Rietveld refinement of the crystal structure.

Place, publisher, year, edition, pages
2015. Vol. 30, no 3, 407-416 p.
National Category
Materials Chemistry
URN: urn:nbn:se:uu:diva-248459DOI: 10.1557/jmr.2014.317ISI: 000349976100009OAI: oai:DiVA.org:uu-248459DiVA: diva2:799740
Available from: 2015-03-31 Created: 2015-03-30 Last updated: 2016-02-24Bibliographically approved

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