Nickel, Manganese, and Cobalt Dissolution from Ni-Rich NMC and Their Effects on NMC622-Graphite Cells
| Autor: | Roland Jung, Moniek Tromp, Christoph Stinner, Fabian Linsenmann, Johannes Wandt, Sophie Solchenbach, Filippo Maglia, Rowena Thomas, Hubert A. Gasteiger |
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| Přispěvatelé: | Catalyst Characterisation (HIMS, FNWI) |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment 020209 energy Inorganic chemistry chemistry.chemical_element 02 engineering and technology Manganese Electrolyte Condensed Matter Physics ddc Surfaces Coatings and Films Electronic Optical and Magnetic Materials Anode Nickel chemistry Transition metal 0202 electrical engineering electronic engineering information engineering Materials Chemistry Electrochemistry Cobalt Cell aging Dissolution |
| Zdroj: | 'Journal of the Electrochemical Society ', vol: 166, pages: A378-A389 (2019) Journal of the Electrochemical Society, 166(2), A378-A389. Electrochemical Society, Inc. |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/2.1151902jes |
| Popis: | Transition metal dissolution from the cathode active material and its deposition on the anode causes significant cell aging, studied most intensively for manganese. Owing to their higher specific energy, the current focus is shifting towards nickel-rich layered LiNixMnyCozO2 (NMC, x + y + z = 1) with x > 0.5, so that the effect of Ni dissolution on cell degradation needs to be understood. This study investigates the dissolution of transition metals from a NMC622 cathode and their subsequent deposition on a graphite anode using operando X-ray absorption spectroscopy. We show that in NMC622-graphite cells transition metals dissolve nearly stoichiometrically at potentials > 4.6 V, highlighting the significance of investigating Ni dissolution/deposition. Using NMC622-graphite full-cells with electrolyte containing the bis(trifluoromethane) sulfonimide (TFSI) salts of either Ni, Mn, or Co, we compare the detrimental impact of these metals on cell performance. Using in-situ and ex-situ XRD, we show that the aging mechanism induced by all three metals is the loss of cycleable lithium in the solid electrolyte interface (SEI) of the graphite. This loss is larger in magnitude when Mn is present in the electrolyte compared to Ni and Co, which we ascribe to a higher activity of deposited Mn towards SEI decomposition in comparison to Ni and Co. (C) The Author(s) 2019. Published by ECS. |
| Databáze: | OpenAIRE |
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