Stabilization of Li-Rich Disordered Rocksalt Oxyfluoride Cathodes by Particle Surface Modification
| Autor: | Jean-Frédéric Martin, Ida Källquist, Adrien Boulineau, Andrew J. Naylor, Johann Chable, Christian Baur, Daniel Brandell, David Peralta, Maximilian Fichtner, Maria Hahlin, Kristina Edström, Jean-François Colin |
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| Rok vydání: | 2020 |
| Předmět: |
Technology
disordered rocksalt Solid-state chemistry Materials science lithium-ion batteries photoelectron spectroscopy Li-rich cathodes Materialkemi Energy Engineering and Power Technology Article particle coatings Cathode law.invention surface modifications X-ray photoelectron spectroscopy Chemical engineering law Materials Chemistry Electrochemistry Chemical Engineering (miscellaneous) Particle Surface modification Electrical and Electronic Engineering ddc:600 surface passivation |
| Zdroj: | ACS Applied Energy Materials ACS applied energy materials, 3 (6), 5937–5948 |
| ISSN: | 2574-0962 |
| Popis: | Promising theoretical capacities and high voltages are offered by Li-rich disordered rocksalt oxyfluoride materials as cathodes in lithium-ion batteries. However, as has been discovered for many other Li-rich materials, the oxyfluorides suffer from extensive surface degradation, leading to severe capacity fading. In the case of Li$_{2}$VO$_{2}$F, we have previously determined this to be a result of detrimental reactions between an unstable surface layer and the organic electrolyte. Herein, we present the protection of Li$_{2}$VO$_{2}$F particles with AlF$_{3}$ surface modification, resulting in a much-enhanced capacity retention over 50 cycles. While the specific capacity for the untreated material drops below 100 mA h g$^{-1}$ after only 50 cycles, the treated materials retain almost 200 mA h g$^{-1}$. Photoelectron spectroscopy depth profiling confirms the stabilization of the active material surface by the surface modification and reveals its suppression of electrolyte decomposition. |
| Databáze: | OpenAIRE |
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