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Simulating Li-ion battery ageing through solid electrolyte interphase growth in graphite/NMC cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ageing mechanisms of graphite/NMC Li-ion batteries have been studied using computational methods. The purpose of the project was to investigate solid electrolyte interphase (SEI) formation and growth during cycling of the battery. The SEI layer formation was considered to be a reason for capacity fade of the battery. Irreversible consumption of cyclable Li-ions and increased resistance in the layer was considered to be the result of solid electrolyte layer formation and these two effects were studied more closely using cell modelling. The battery cycled with three cases of fast charge rates (2C, 4C and 6C) and the same discharge rate (1C) showed a thick film formation on the anode side and a higher film resistance when compared to the battery cycled with the same charge/discharge rate (1C). All investigated batteries were affected by the studied ageing mechanism, and in the case of batteries cycled with fast charge rates, the ageing was even more pronounced. The report includes a general description of Li-ion battery functionality, a summary of ageing mechanisms and a mathematical description of the electrochemistry governing the battery and implemented in the software.

Place, publisher, year, edition, pages
2017. , p. 34
Series
UPTEC K, ISSN 1650-8297 ; 17032
Keywords [en]
Li-ion battery, graphite, ageing, SEI layer, asymmetric cycling
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-334651OAI: oai:DiVA.org:uu-334651DiVA, id: diva2:1160250
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2018-01-30 Created: 2017-11-25 Last updated: 2018-01-30Bibliographically approved

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CiteExportLink to record
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