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A model for predicting capacity fade due to SEI formation in a commercial graphite/LiFePO4 cell
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0001-9203-9313
2015 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 162, no 6, A1003-A1007 p.Article in journal (Refereed) Published
Abstract [en]

An aging model for a negative graphite electrode in a lithium-ion battery, for moderate currents up to 1C, is derived and fitted to capacity fade experimental data. The predictive capabilities of the model, using only four fitted parameters, are demonstrated at both 25°C and 45°C. The model is based on a linear combination of two current contributions: one stemming from parts of the graphite particles covered by an intact microporous solid-electrolyte-interface (SEI) layer, and one contribution from parts of the particles were the SEI layer has cracked due to graphite expansion. Mixed kinetic and transport control is used to describe the electrode kinetics.

Place, publisher, year, edition, pages
2015. Vol. 162, no 6, A1003-A1007 p.
Keyword [en]
Electrodes, Graphite, Graphite electrodes, Lithium alloys, Seebeck effect, Solid electrolytes, Electrode kinetics, Graphite particles, Linear combinations, Microporous solids, Mixed kinetics, Predictive capabilities, SEI formations, Transport control
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-167007DOI: 10.1149/2.0641506jesISI: 000353009300030ScopusID: 2-s2.0-84928318589OAI: diva2:813662

QC 20150525

Available from: 2015-05-25 Created: 2015-05-21 Last updated: 2015-08-05Bibliographically approved

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Ekström, HenrikLindbergh, Göran
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