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Communication—Identifying and Managing Reversible Capacity Losses that Falsify Cycle Ageing Tests of Lithium-Ion Cells.

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Bibliographic Details
Title: Communication—Identifying and Managing Reversible Capacity Losses that Falsify Cycle Ageing Tests of Lithium-Ion Cells.
Authors: Burrell, Robert1, Zulke, Alana1 a.zulke@lancaster.ac.uk, Keil, Peter2, Hoster, Harry1
Source: Journal of The Electrochemical Society. Oct2020, Vol. 167 Issue 13, p138-143. 6p.
Subjects: Anodes, Time measurements, Cells, Lithium ions
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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
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. [ABSTRACT FROM AUTHOR]
ISSN:00134651
DOI:10.1149/1945-7111/abbce1