Somerville, Limhi, Barenoa, J., Trask, S., Jennings, P. A. (Paul A.), McGordon, Andrew, Lyness, C. and Bloom, I. (2016) The effect of charging rate on the graphite electrode of commercial lithium-ion cells : a post-mortem study. Journal of Power Sources, 335 . pp. 189-196.

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Abstract

Increased charging rates negatively affect the lifetime of lithium-ion cells by increasing cell resistance and reducing capacity. This work is a post-mortem study of 18650-type cells subjected to charge rates of 0.7-, 2-, 4-, and 6-C. For cells charged at 0.7-C to 4-C, this performance degradation is primarily related to surface film thickness with no observable change in surface film chemical composition. However, at charge rates of 6-C, the chemical composition of the surface film changes significantly, suggesting that this change is the reason for the sharper increase in cell resistance compared to the lower charge rates. In addition, we found that surface film formation was not uniform across the electrode. Surface film was thicker and chemically different along the central band of the electrode “jelly roll”. This result is most likely attributable to an increase in temperature that results from non-uniform electrode wetting during manufacture. This non-uniform change further resulted in active material delamination from the current collector owing to chemical changes to the binder for the cell charged at 6-C.

Item Type:	Journal Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH):	Lithium ion batteries, Electric vehicles -- Batteries
Journal or Publication Title:	Journal of Power Sources
Publisher:	Elsevier S.A.
ISSN:	0378-7753
Official Date:	15 December 2016
Dates:	Date Event 15 December 2016 Published 22 October 2016 Available 3 October 2016 Accepted 29 July 2016 Submitted
Date of first compliant deposit:	13 February 2017
Volume:	335
Page Range:	pp. 189-196
Status:	Peer Reviewed
Publication Status:	Published
Funder:	Engineering and Physical Sciences Research Council (EPSRC), High Value Manufacturing Catapult, Jaguar Land Rover (Firm), United States. Department of Energy. Office of Vehicle Technologies (OTV), University of Chicago
Grant number:	EP/I01585X/1 (EPSRC), Contract No. DE-AC02-06CH11357 (OTV), Contract No. W-31-109-Eng-38 (University of Chicago)

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