Riekehr, Lars ; Liu, Jinlong ; Schwarz, Björn ; Sigel, Florian ; Kerkamm, Ingo ; Xia, Yongyao ; Ehrenberg, Helmut (2016)
Fatigue in 0.5Li2MnO3:0.5Li(Ni1/3Co1/3Mn1/3)O2 positive electrodes for lithium ion batteries.
In: Journal of Power Sources, 325
doi: 10.1016/j.jpowsour.2016.06.014
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Two different Li-rich nickelecobaltemanganese-oxide (Li-rich NCM) active materials with the same nominal composition 0.5Li2MnO3:0.5Li(Ni1/3Co1/3Mn1/3)O2 but different pristine nano structure have been analyzed structurally and electrochemically in different cycling states. For structural characterization, transmission electron microscopy (TEM) and high resolution synchrotron powder diffraction (SXRD) experiments were conducted. The changes in structure with increasing cycle number are correlated with characteristic features in the corresponding electrochemical dQ/dV-profiles that were obtained by galvanostatically cycling the two different active materials. The presented data demonstrates that structural changes upon cycling, e.g. LiMnO2 and spinel formation, strongly depend on the degree oxygen is involved in the reversible charge compensation for delithiation/lithiation. According to our data, firstly a twin-like environment with nanometer dimensions is formed within the R-3m matrix during the initial cycle, which then gradually transforms into a spinel-like structure with increasing cycle number. As another result, we can show that Li2MnO3 to LiMnO2 transformation is not directly dependent in the irreversible oxygen loss in the first cycle but more importantly on transition metal migration. A model is presented explaining the dependency of LiMnO2 and spinel formation on the ability of Li-rich active materials to include oxygen in the charge compensation process. © 2016 Elsevier B.V. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Riekehr, Lars ; Liu, Jinlong ; Schwarz, Björn ; Sigel, Florian ; Kerkamm, Ingo ; Xia, Yongyao ; Ehrenberg, Helmut |
| Art des Eintrags: | Bibliographie |
| Titel: | Fatigue in 0.5Li2MnO3:0.5Li(Ni1/3Co1/3Mn1/3)O2 positive electrodes for lithium ion batteries |
| Sprache: | Englisch |
| Publikationsjahr: | 2016 |
| Verlag: | Elsevier B.V. |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Power Sources |
| Jahrgang/Volume einer Zeitschrift: | 325 |
| DOI: | 10.1016/j.jpowsour.2016.06.014 |
| Kurzbeschreibung (Abstract): | Two different Li-rich nickelecobaltemanganese-oxide (Li-rich NCM) active materials with the same nominal composition 0.5Li2MnO3:0.5Li(Ni1/3Co1/3Mn1/3)O2 but different pristine nano structure have been analyzed structurally and electrochemically in different cycling states. For structural characterization, transmission electron microscopy (TEM) and high resolution synchrotron powder diffraction (SXRD) experiments were conducted. The changes in structure with increasing cycle number are correlated with characteristic features in the corresponding electrochemical dQ/dV-profiles that were obtained by galvanostatically cycling the two different active materials. The presented data demonstrates that structural changes upon cycling, e.g. LiMnO2 and spinel formation, strongly depend on the degree oxygen is involved in the reversible charge compensation for delithiation/lithiation. According to our data, firstly a twin-like environment with nanometer dimensions is formed within the R-3m matrix during the initial cycle, which then gradually transforms into a spinel-like structure with increasing cycle number. As another result, we can show that Li2MnO3 to LiMnO2 transformation is not directly dependent in the irreversible oxygen loss in the first cycle but more importantly on transition metal migration. A model is presented explaining the dependency of LiMnO2 and spinel formation on the ability of Li-rich active materials to include oxygen in the charge compensation process. © 2016 Elsevier B.V. All rights reserved. |
| Freie Schlagworte: | TEM, Synchrotron XRD, Li-rich composites, Irreversible oxygen loss, Anionic charge compensation |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Erneuerbare Energien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 20 Jun 2016 10:54 |
| Letzte Änderung: | 20 Jun 2016 10:54 |
| PPN: | |
| Sponsoren: | Financial support from the Deutsche Forschungsgemeinschaft DFG within the Research Collaborative Centre 595 “Electrical Fatigue in Functional Materials” (Project T3) is gratefully acknowledged. |
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