Vis enkel innførsel

dc.contributor.authorGunnarshaug, Astrid Fagertun
dc.contributor.authorKjelstrup, Signe
dc.contributor.authorBedeaux, Dick
dc.contributor.authorRichter, Frank
dc.contributor.authorBurheim, Odne Stokke
dc.date.accessioned2020-01-15T07:54:33Z
dc.date.available2020-01-15T07:54:33Z
dc.date.created2020-01-06T16:00:23Z
dc.date.issued2019
dc.identifier.issn0013-4686
dc.identifier.urihttp://hdl.handle.net/11250/2636310
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.language.isoengnb_NO
dc.publisherElseviernb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleThe reversible heat effects at lithium iron phosphate- and graphite electrodesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.journalElectrochimica Actanb_NO
dc.identifier.doi10.1016/j.electacta.2019.135567
dc.identifier.cristin1767166
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 http://creativecommons.org/licenses/by-nc-nd/4.0/nb_NO
cristin.unitcode194,66,25,0
cristin.unitcode194,64,25,0
cristin.unitnameInstitutt for kjemi
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.ispublishedfalse
cristin.fulltextpostprint
cristin.qualitycode2


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel

Navngivelse 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Navngivelse 4.0 Internasjonal