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dc.contributor.authorEl-Kharbachi, Abdelouahab
dc.contributor.authorHu, Yang
dc.contributor.authorSørby, Magnus Helgerud
dc.contributor.authorVullum, Per Erik
dc.contributor.authorMæhlen, Jan Petter
dc.contributor.authorFjellvåg, Helmer
dc.contributor.authorHauback, Bjørn
dc.date.accessioned2019-01-08T15:53:43Z
dc.date.available2019-01-08T15:53:43Z
dc.date.created2018-05-03T16:30:19Z
dc.date.issued2018
dc.identifier.citationJournal of Physical Chemistry C. 2018, 122 (16), 8750-8759.nb_NO
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11250/2579792
dc.description.abstractPrevious studies have demonstrated that MgH2 is a promising conversion-type anode toward Li with high capacity (2037 mAh/g) and low discharge/charge overpotential hysteresis. A major challenge is the capacity loss after a few cycles. To improve the understanding of the complex conversion mechanism at the electrode/electrolyte interface and of its possible evolution, a systematic investigation of the morphology–property relation is undertaken. A multitude of MgH2 materials are obtained by mechanical milling using different devices, milling conditions, and time intervals. Upon cycling, the performance of the assembled batteries is strongly dependent on the quality of the prepared MgH2 powders. Electrochemical discharge/charge profiles (MgH2 ⇆ 2LiH + Mg) are discussed according to the changes in microstructure and morphology revealed by powder X-ray diffraction and transmission electron microscopy. For all electrode composites, the loss of the capacity occurs typically during delithiation in agreement with a kinetically limited process, namely, of LiH “detachment”. Electrochemical impedance spectroscopy is meaningfully carried out using the representative tape-casted electrodes in Li/MgH2 cells to monitor the evolution of resistance components, in particular the formation of a solid electrolyte interphase (SEI)-like layer as a function of particle size, state of charge, and cycle number.nb_NO
dc.language.isoengnb_NO
dc.publisherAmerican Chemical Societynb_NO
dc.titleUnderstanding Capacity Fading of MgH2 Conversion-Type Anodes via Structural Morphology Changes and Electrochemical Impedancenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber8750-8759nb_NO
dc.source.volume122nb_NO
dc.source.journalJournal of Physical Chemistry Cnb_NO
dc.source.issue16nb_NO
dc.identifier.doi10.1021/acs.jpcc.7b12656
dc.identifier.cristin1583290
dc.relation.projectNorges forskningsråd: 244054nb_NO
dc.description.localcode© American Chemical Society 2018. This is the authors accepted and refereed manuscript to the article. Locked until 4 April 2019 due to copyright restrictions.nb_NO
cristin.unitcode194,66,20,0
cristin.unitnameInstitutt for fysikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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