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Magnetic and structural approach for understanding the electrochemical behavior of LiNi0.33Co0.33Mn0.33O2 positive electrode material

Labrini, Mohamed and Saadoune, Ismael and Scheiba, Frieder and Almaggoussi, Abdelmajid and Elhaskouri, Jamal and Amoros, Pedro and Ehrenberg, Helmut and Brötz, Joachim (2013):
Magnetic and structural approach for understanding the electrochemical behavior of LiNi0.33Co0.33Mn0.33O2 positive electrode material.
111, In: Electrochimica Acta, pp. 567-574. Elsevier Science Publishing, ISSN 00134686,
[Article]

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.

Item Type: Article
Erschienen: 2013
Creators: Labrini, Mohamed and Saadoune, Ismael and Scheiba, Frieder and Almaggoussi, Abdelmajid and Elhaskouri, Jamal and Amoros, Pedro and Ehrenberg, Helmut and Brötz, Joachim
Title: Magnetic and structural approach for understanding the electrochemical behavior of LiNi0.33Co0.33Mn0.33O2 positive electrode material
Language: English
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.

Journal or Publication Title: Electrochimica Acta
Volume: 111
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Layered compound, Chemical synthesis, X-ray diffraction, Electrochemical measurements, Magnetic structure
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 14 Mar 2014 12:37
Official URL: http://dx.doi.org/10.1016/j.electacta.2013.08.051
Identification Number: doi:10.1016/j.electacta.2013.08.051
Funders: 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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