Labrini, Mohamed ; Saadoune, Ismael ; Scheiba, Frieder ; Almaggoussi, Abdelmajid ; Elhaskouri, Jamal ; Amoros, Pedro ; Ehrenberg, Helmut ; Brötz, Joachim (2013)
Magnetic and structural approach for understanding the electrochemical behavior of LiNi0.33Co0.33Mn0.33O2 positive electrode material.
In: Electrochimica Acta, 111
doi: 10.1016/j.electacta.2013.08.051
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A systematic study has been performed to investigate the structural and magnetic changes in LiNi0.33Mn0.33Co0.33O2, a member of the LiNiyMnyCo1–2yO2 series, upon chemical lithium deintercalation. Structural characterization of the chemically delithiated LixNi0.33Mn0.33Co0.33O2 samples indicates that the initial rhombohedral symmetry (α-NaFeO2 type structure) is maintained in the whole 0.3 ≤ x ≤ 1.0 composition range. Less than 1% variation in the hexagonal unit cell volume was evidenced showing a good structural stability of this sample. SEM pictures of the delithiated phases confirm this stability. Indeed, the particle size average undergoes a small decrease (from 180 nm at x = 1.0–130 nm for x = 0.3). The magnetic properties (SQUID and EPR) of LixNi0.33Mn0.33Co0.33O2 compounds were also investigated. A simultaneous oxidation of Ni2+to Ni4+ via Ni3+and Co3+ to Co4+ was observed upon lithium removal. EPR signals registered at 100 K, coupled to SQUID measurements, revealed strong antiferromagnetic interactions within the structure of this sample which became more pronounced by the delithiation process.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2013 |
| Autor(en): | Labrini, Mohamed ; Saadoune, Ismael ; Scheiba, Frieder ; Almaggoussi, Abdelmajid ; Elhaskouri, Jamal ; Amoros, Pedro ; Ehrenberg, Helmut ; Brötz, Joachim |
| Art des Eintrags: | Bibliographie |
| Titel: | Magnetic and structural approach for understanding the electrochemical behavior of LiNi0.33Co0.33Mn0.33O2 positive electrode material |
| Sprache: | Englisch |
| Publikationsjahr: | 30 November 2013 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Electrochimica Acta |
| Jahrgang/Volume einer Zeitschrift: | 111 |
| DOI: | 10.1016/j.electacta.2013.08.051 |
| Kurzbeschreibung (Abstract): | A systematic study has been performed to investigate the structural and magnetic changes in LiNi0.33Mn0.33Co0.33O2, a member of the LiNiyMnyCo1–2yO2 series, upon chemical lithium deintercalation. Structural characterization of the chemically delithiated LixNi0.33Mn0.33Co0.33O2 samples indicates that the initial rhombohedral symmetry (α-NaFeO2 type structure) is maintained in the whole 0.3 ≤ x ≤ 1.0 composition range. Less than 1% variation in the hexagonal unit cell volume was evidenced showing a good structural stability of this sample. SEM pictures of the delithiated phases confirm this stability. Indeed, the particle size average undergoes a small decrease (from 180 nm at x = 1.0–130 nm for x = 0.3). The magnetic properties (SQUID and EPR) of LixNi0.33Mn0.33Co0.33O2 compounds were also investigated. A simultaneous oxidation of Ni2+to Ni4+ via Ni3+and Co3+ to Co4+ was observed upon lithium removal. EPR signals registered at 100 K, coupled to SQUID measurements, revealed strong antiferromagnetic interactions within the structure of this sample which became more pronounced by the delithiation process. |
| Freie Schlagworte: | Layered compound, Chemical synthesis, X-ray diffraction, Electrochemical measurements, Magnetic structure |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Strukturforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 14 Mär 2014 12:37 |
| Letzte Änderung: | 14 Mär 2014 12:37 |
| PPN: | |
| Sponsoren: | The authors are grateful to the CNRST (Morocco, RS2011/03); to the DFG (Germany, EH 183/13-1) and to IRESEN (Morocco, P1.P2.2.) for their financial support., This work was also supported by the ERASMUS MUNDUS program (FAME network). |
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