Mellin, Maximilian ; Cherkashinin, Gennady ; Mohseni, Elham ; Phillips, Robert ; Jaegermann, Wolfram ; Hofmann, Jan P. (2024)
Voltage-dependent charge compensation mechanism and cathode electrolyte interface stability of the lithium-ion battery cathode materials LiCoO2 and LiNi1/3Mn1/3Co1/3O2 studied by photoelectron spectroscopy.
In: Journal of Materials Chemistry A, 12 (6)
doi: 10.1039/D3TA05981B
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Enhancing the high voltage limit of layered LiTMO 2 (TM = 3d transition metal) cathode materials has motivated intensive research on their properties at high states of charge. This led to controversies regarding the origin of anionic and cationic redox reaction, the reversibility of oxygen redox reaction, the degree of covalency, and the intrinsic voltage limits of cathode materials. In this study, the commercially used cathode materials LiCoO 2 (LCO) and LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC333) were investigated by core level photoelectron spectroscopy (XPS) after charging to different voltages. A large fraction of the cathode electrolyte interface (CEI) was removed after in vacuo scratching of the surface, enabling insights into the fundamental charge compensation mechanism in the bulk obtained by XPS. To gain insights into the oxidation state using XPS, the origin of the 2p satellite structure seen in the XPS spectra of transition metal oxides is reconsidered in comparison to reference materials. Additionally, both the CEI stability and the electrochemical behaviour are discussed and correlated to the charge compensation mechanism. For LCO, the XPS results confirm the intrinsic voltage limit of 4.2 V vs. Li + /Li with the Co 3+ /Co 4+ -redox couple at 4.0 V and subsequent oxygen-redox and CEI instability. For NMC333, the Ni 3+ /Ni 4+ redox couple at 3.7 V, the Co 3+ /Co 4+ -redox couple at 4.0 V, and manganese in a stable formal oxidation state of 3.7+ were identified. The intrinsic voltage limit in NMC333 is enhanced to 4.5 V vs. Li + /Li.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Mellin, Maximilian ; Cherkashinin, Gennady ; Mohseni, Elham ; Phillips, Robert ; Jaegermann, Wolfram ; Hofmann, Jan P. |
| Art des Eintrags: | Bibliographie |
| Titel: | Voltage-dependent charge compensation mechanism and cathode electrolyte interface stability of the lithium-ion battery cathode materials LiCoO2 and LiNi1/3Mn1/3Co1/3O2 studied by photoelectron spectroscopy |
| Sprache: | Englisch |
| Publikationsjahr: | 2024 |
| Verlag: | Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Chemistry A |
| Jahrgang/Volume einer Zeitschrift: | 12 |
| (Heft-)Nummer: | 6 |
| DOI: | 10.1039/D3TA05981B |
| Kurzbeschreibung (Abstract): | Enhancing the high voltage limit of layered LiTMO 2 (TM = 3d transition metal) cathode materials has motivated intensive research on their properties at high states of charge. This led to controversies regarding the origin of anionic and cationic redox reaction, the reversibility of oxygen redox reaction, the degree of covalency, and the intrinsic voltage limits of cathode materials. In this study, the commercially used cathode materials LiCoO 2 (LCO) and LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC333) were investigated by core level photoelectron spectroscopy (XPS) after charging to different voltages. A large fraction of the cathode electrolyte interface (CEI) was removed after in vacuo scratching of the surface, enabling insights into the fundamental charge compensation mechanism in the bulk obtained by XPS. To gain insights into the oxidation state using XPS, the origin of the 2p satellite structure seen in the XPS spectra of transition metal oxides is reconsidered in comparison to reference materials. Additionally, both the CEI stability and the electrochemical behaviour are discussed and correlated to the charge compensation mechanism. For LCO, the XPS results confirm the intrinsic voltage limit of 4.2 V vs. Li + /Li with the Co 3+ /Co 4+ -redox couple at 4.0 V and subsequent oxygen-redox and CEI instability. For NMC333, the Ni 3+ /Ni 4+ redox couple at 3.7 V, the Co 3+ /Co 4+ -redox couple at 4.0 V, and manganese in a stable formal oxidation state of 3.7+ were identified. The intrinsic voltage limit in NMC333 is enhanced to 4.5 V vs. Li + /Li. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung |
| Hinterlegungsdatum: | 11 Dez 2024 06:33 |
| Letzte Änderung: | 11 Dez 2024 11:56 |
| PPN: | 524519919 |
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