The effect of charging rate on the graphite electrode of commercial lithium-ion cells [electronic resource] : A post-mortem study

Published: Argonne, Ill. : Argonne National Laboratory, 2016.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description: pages 189-196 : digital, PDF file
Additional Creators: Argonne National Laboratory, Engineering and Physical Sciences Research Council, United States. Office of the Assistant Secretary of Energy Efficiency and Renewable Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary

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 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. As a result, 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.

Report Numbers

E 1.99:1339417

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Published through SciTech Connect.
10/22/2016.
"129181"
Journal of Power Sources 335 C ISSN 0378-7753 AM
L. Somerville; J. Bareno; S. Trask; P. Jennings; A. McGordon; C. Lyness; Ira Bloom.
WMG centre HVM Catapult
Jaguar Land Rover;

Funding Information

AC02-06CH11357

View MARC record | catkey: 23760118