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Laurita, A., Zhu, L., Cabelguen, P.-E., Auvergniot, J., Hamon, J., Guyomard, D., Dupre, N. & Moreau, P. (2022) Pristine Surface of Ni-Rich Layered Transition Metal Oxides as a Premise of Surface Reactivity. Acs Applied Materials & Interfaces, 14 41945–41956.
Added by: Richard Baschera (2022-10-06 09:50:57) Last edited by: Richard Baschera (2022-10-06 09:51:52) |
| Type de référence: Article DOI: 10.1021/acsami.2c09358 Numéro d'identification (ISBN etc.): 1944-8244 Clé BibTeX: Laurita2022 Voir tous les détails bibliographiques  |
Catégories: IMN, INTERNATIONAL, ST2E Créateurs: Auvergniot, Cabelguen, Dupre, Guyomard, Hamon, Laurita, Moreau, Zhu Collection: Acs Applied Materials & Interfaces |
Consultations : 1/241
Indice de consultation : 9% Indice de popularité : 2.25% |
| Résumé |
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The surface reactivity of Ni-rich layered transition metal oxides is instrumental to the performance of batteries based on these positive electrode materials. Most often, strong surface modifications are detailed with respect to a supposed ideal initial state. Here, we study the LiNi0.8Mn0.1Co0.1O2 (NMC811) cathode material in its pristine state, hence before any contact with electrolyte or cycling, thanks to advanced microscopy and spectroscopy techniques to fully characterize its surface down to the nanometer scale. Scanning transmission electron microscopy- electron energy loss spectroscopy (STEM-EELS), solid-state nuclear magnetic resonance (SS-NMR), and X-ray photoelectron spectroscopy (XPS) are combined and correlated in an innovative manner. The results demonstrate that in usual storage conditions after synthesis, the extreme surface is already chemically different from the nominal values. In particular, nickel is found in a reduced state compared to the bulk value, and a Mn enrichment is determined in the first few nanometers of primary particles. Further exposition to humid air allows for quantifying the formed lithiated species per gram of active material, identifying their repartition and proposing a reaction path in relation with the instability of the surface.
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