Communication⇔identifying and managing reversible capacity losses that falsify cycle ageing tests of lithium-ion cells
| Autor: | Robert Burrell, Harry E. Hoster, Alana Aragon Zulke, Peter Keil |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment 020209 energy Voltage limit chemistry.chemical_element 02 engineering and technology Condensed Matter Physics Slow transport Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Anode chemistry Ageing Chemical physics 0202 electrical engineering electronic engineering information engineering Materials Chemistry Electrochemistry Degradation (geology) Lithium Elektrotechnik |
| Popis: | 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. © 2020 The Electrochemical Society (“ECS”). |
| Databáze: | OpenAIRE |
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