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dc.contributor.authorGunnarshaug, Astrid Fagertun
dc.contributor.authorKjelstrup, Signe
dc.contributor.authorBedeaux, Dick
dc.contributor.authorRichter, Frank
dc.contributor.authorBurheim, Odne Stokke
dc.description.abstractLithium ion batteries are used to store and produce electric energy. During the charging- and discharging processes, net heat is released or adsorbed in the battery. Temperature is one of the most important factors for battery ageing. In this study we are seeking a fundamental understanding of one of the heat effects, the reversible heat source. The role played by local reversible heat changes is mostly overlooked. We show that, despite a small full cell battery entropy change, there are large reversible half cell heat effects of opposite signs in the lithium iron phosphate oxide and lithium graphite electrode compartments. We present for the first time the Peltier heat of the LiFePO4 electrode near 0% state of charge. The results are documented by thermoelectric potentials which are measured over days to achieve a stationary state. Experiments, supported by theory, enable us to decompose two processes with different characteristic times. We report effective diffusion coefficients for LiPF6, and diethyl carbonate.nb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleThe reversible heat effects at lithium iron phosphate- and graphite electrodesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalElectrochimica Actanb_NO
dc.relation.projectNorges forskningsråd: Project no 262644nb_NO
dc.description.localcode© 2019. This is the authors’ accepted and refereed manuscript to the article. Locked until 31.12.2021due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
cristin.unitnameInstitutt for kjemi
cristin.unitnameInstitutt for energi- og prosessteknikk

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal