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

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...

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Veröffentlicht in:Journal of the Electrochemical Society 2020-10, Vol.167 (13), p.130544
Hauptverfasser: Burrell, Robert, Zulke, Alana, Keil, Peter, Hoster, Harry
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creator Burrell, Robert
Zulke, Alana
Keil, Peter
Hoster, Harry
description 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.
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subjects Anode Overhang
Batteries Li-ion
Charging Voltage
Cycle Ageing
Passive Electrode Effect
Reversible Capacity Fade
title Communication—Identifying and Managing Reversible Capacity Losses that Falsify Cycle Ageing Tests of Lithium-Ion Cells
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