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Inhomogeneous active layer contact loss in a cycled prismatic lithium-ion cell caused by the jelly-roll curvature
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.ORCID iD: 0000-0003-3436-6134
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.ORCID iD: 0000-0001-9203-9313
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry. Scania CV AB, SE-151 87 Södertälje, Sweden.ORCID iD: 0000-0003-4901-5820
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0002-0307-8917
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2018 (English)In: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 20, p. 213-217Article in journal (Refereed) Published
Abstract [en]

Internal resistance is a key parameter that affects the power, energy, efficiency, lifetime, and safety of a lithium-ion battery. It grows due to chemical and mechanical battery wear during ageing. In this work, the effect of the jelly-roll winding curvature on impedance rise is investigated. NMC electrode samples, harvested from the curved as well as the flat regions of the jelly-roll from cycle-aged and calendar-aged prismatic cells (25 Ah, hard casing) are investigated by electrochemical impedance spectroscopy. After cycling, larger impedance rise is observed at the outer radius (concave) of the curved region compared to the inner radius (convex) or the flat region of the jelly-roll, and the difference increases with a decrease in the jelly-roll radius of curvature, from the cell skin towards the core. To identify the causes behind the observed difference in the impedance rise, investigations at different external compression (0 and 2.5 MPa) and temperature (5 and 25 °C) are performed. The results show that contact loss between the current collector and the active layer is the main source of the difference in impedance rise. Mechanical mechanisms that may cause the contact loss are discussed and design recommendations to mitigate the rise in impedance are given. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 20, p. 213-217
Keywords [en]
Bending stress, Contact loss, Curvature, Diffusion induced stress (DIS), Lithium-ion battery, Mechanical ageing, Electrochemical impedance spectroscopy, Ions, Stresses, Diffusion induced stresses (DIS), Lithium-ion batteries
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-236555DOI: 10.1016/j.est.2018.09.012ISI: 000451147100021Scopus ID: 2-s2.0-85054131101OAI: oai:DiVA.org:kth-236555DiVA, id: diva2:1266137
Funder
Swedish Energy Agency, 30770-3
Note

Funding text: This work was supported by the Swedish Energy Agency ( 30770-3 ) under the program Energy Efficient Vehicles, the StandUp for Energy, the Battery Fund Program, and Swedish Electromobility Centre. Dr. Fernanda Marzano (Scania CV AB) is acknowledged for helping with the cell opening. Appendix A. QC 20181127

Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2018-12-11Bibliographically approved

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Mussa, AbdilbariLindbergh, GöranKlett, MatildaGudmundson, PeterLindström, Rakel

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