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New in-situ neutron diffraction cell for electrode materials
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
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2014 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 248, 900-904 p.Article in journal (Refereed) Published
Abstract [en]

A novel neutron diffraction cell has been constructed to allow in-situ studies of the structural changes in materials of relevance to battery applications during charge/discharge cycling. The new design is based on the coin cell geometry, but has larger dimensions compared to typical commercial batteries in order to maximize the amount of electrode material and thus, collect diffraction data of good statistical quality within the shortest possible time. An important aspect of the design is its modular nature, allowing flexibility in both the materials studied and the battery configuration. This paper reports electrochemical tests using a Nickel-metal-hydride battery (Ni-MH), which show that the cell is able to deliver 90% of its theoretical capacity when using deuterated components. Neutron diffraction studies performed on the Polaris diffractometer using nickel metal and a hydrogen-absorbing alloy (MH) clearly show observable changes in the neutron diffraction patterns as a function of the discharge state. Due to the high quality of the diffraction patterns collected in-situ (i.e. good peak-to-background ratio), phase analysis and peak indexing can be performed successfully using data collected in around 30 min. In addition to this, structural parameters for the beta-phase (charged) MH electrode obtained by Rietveld refinement are presented.

Place, publisher, year, edition, pages
2014. Vol. 248, 900-904 p.
Keyword [en]
Neutron diffraction, In-situ electrochemical cell, Electrode materials, Ni-MH battery, Secondary batteries
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-220280DOI: 10.1016/j.jpowsour.2013.09.141ISI: 000330551000112OAI: oai:DiVA.org:uu-220280DiVA: diva2:706323
Available from: 2014-03-19 Created: 2014-03-12 Last updated: 2014-03-19Bibliographically approved

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Edstrom, Kristina
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