Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/103333
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dc.contributor.authorMaher, Kenzaen
dc.contributor.authorYazami, Rachiden
dc.date.accessioned2014-12-15T06:47:38Zen
dc.date.accessioned2019-12-06T21:10:17Z-
dc.date.available2014-12-15T06:47:38Zen
dc.date.available2019-12-06T21:10:17Z-
dc.date.copyright2013en
dc.date.issued2013en
dc.identifier.citationMaher, K., & Yazami, R. (2014). A study of lithium ion batteries cycle aging by thermodynamics techniques. Journal of power sources, 247, 527-533.en
dc.identifier.issn0378-7753en
dc.identifier.urihttps://hdl.handle.net/10356/103333-
dc.identifier.urihttp://hdl.handle.net/10220/24463en
dc.description.abstractLithium ion batteries (LiB) are cycled under a galvanostatic regime (∼C/2-rate) between 2.75 V and 4.2 V for up to 1000 cycles. After each completed 100 cycles, the discharge capacity, capacity loss, average discharge potential were determined under the same C/2 rate. Then cells undergo an additional charge and discharge cycle at C/6 rate followed by a thermodynamics measurements test. This enables open-circuit potential (OCP), entropy (ΔS) and enthalpy (ΔH) data to be assessed. It is found that with increasing cycle number, the entropy and enthalpy profiles show more significant changes than those observed in the discharge and the OCP curves especially at particular SOC and OCP values. These differences are attributed to the higher sensitivity of entropy and enthalpy state functions to changes in the crystal structure of the graphite anode and the lithiated cobalt oxide (LCO) induced by cycle aging compared to the free energy ΔG (OCP) alone. The thermodynamics data are supported by post-mortem X-ray diffractometry (XRD) and Raman scattering (RS) analyses on the electrode materials. The results show important LCO crystal structure degradation, whereas, surprisingly, the graphite anode remains almost unaffected by heavy cycling, if not improved.en
dc.language.isoenen
dc.relation.ispartofseriesJournal of power sourcesen
dc.rights© 2013 Elsevier B.V.en
dc.subjectDRNTU::Engineering::Materials::Energy materialsen
dc.titleA study of lithium ion batteries cycle aging by thermodynamics techniquesen
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen
dc.contributor.researchEnergy Research Institute @NTUen
dc.identifier.doi10.1016/j.jpowsour.2013.08.053en
item.fulltextNo Fulltext-
item.grantfulltextnone-
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