Communication⇔identifying and managing reversible capacity losses that falsify cycle ageing tests of lithium-ion cells

Burrell, Robert and Zulke, Alana and Keil, Peter and Hoster, Harry (2020) Communication⇔identifying and managing reversible capacity losses that falsify cycle ageing tests of lithium-ion cells. Journal of The Electrochemical Society, 167 (13). ISSN 0013-4651

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Abstract

We report on a cycle ageing study of commercial NCA/Gr+Si cells, in which reversible capacity fluctuations turn a central experimental finding upside down: an upper voltage limit of 4.1 V seems to cause faster degradation than going all the way to 4.2 V. The underlying effect is the reversible loss of lithium inventory into passive anode overhang areas. We demonstrate how the resulting artefact arises from a combination of slow transport processes and the related time periods spent in specific state-of-charge regions. We propose an alternative visualisation tool to identify and manage such artefacts, often neglected in typical ageing studies.

Item Type:
Journal Article
Journal or Publication Title:
Journal of The Electrochemical Society
Additional Information:
This is an author-created, un-copyedited version of an article accepted for publication/published in Journal of The Electrochemical Society. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi: 10.1149/1945-7111/abbce1
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
153172
Deposited By:
Deposited On:
25 Mar 2021 10:45
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Jun 2021 04:21