The LiyNi0.2Mn0.2Co0.6O2 electrode materials: A structural and magnetic study |
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| Authors: | Mohamed Labrini Ismael Saadoune Abdelmajid Almaggoussi Jamal Elhaskouri Pedro Amoros |
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| Affiliation: | 1. LCME, FST Marrakech, University Cadi Ayyad, BP549, Av. A. Khattabi, Marrakech, Morocco;2. EEMO, FST Marrakech, University Cadi Ayyad, BP549, Av. A. Khattabi, Marrakech, Morocco;3. Instituto Universitario de Ciencia de los Materiales, ICMUV Valencia, Spain;4. Institut de Ciència dels Materials and Fundació General, Universitat de València, Amadeu de Savoia – C.P. 46010 Valencia, Spain;1. LPMMAT,Université Hassan II-Casablanca, Faculté des Sciences Ain Chock, BP 5366 Mâarif–Casablanca, Morocco;2. Institue Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France;1. ICMMO/LEMHE, Université Paris-Sud 11, 91405 Orsay Cedex, France;2. State Key Laboratory for Mechanical Behavior of Materials, Xian Jiaotong University, Xian 710049, Shaanxi, PR China;1. College of Physics and Electronics, Shandong Normal University, Jinan 250014, PR China;2. Shandong Cadre School of Quality and Technical Supervision, Jinan 250014, PR China;3. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China;1. Laboratoire de Physico-Chimie des Matériaux Inorganiques, Faculté des Sciences Aïn-Chock, Université Hassan II Casablanca, B.P. 5366 Mâarif, Morocco;2. Laboratoire de Physique des Matériaux, Micro-électronique, Automatique et Thermique, Faculté des Sciences Aïn-Chock, Université Hassan II Casablanca, B.P. 5366 Mâarif, Morocco;3. Univ. Hassan 1er, Laboratoire des Sciences des Matériaux, des Milieux et de la Modélisation (LS3M), 25000 Khouribga, Morocco;4. Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France;1. A.Chelkowski Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland;2. Institute for Molecules and Materials Le Mans, University of Maine, av. O. Messiaen, 72085 Le Mans, France;3. Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, ul. Bobrzynskiego 14, 30-348 Cracow, Poland;4. Faculty of Earth Sciences, University of Silesia, ul. Bedzinska 60, 41-200 Sosnowiec, Poland |
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| Abstract: | Layered LiNi0.2Mn0.2Co0.6O2 phase, belonging to a solid solution between LiNi1/2Mn1/2O2 and LiCoO2 most commercialized cathodes, was prepared via the combustion method at 900 °C for a short time (1 h). Structural and magnetic properties of this material during chemical extraction were investigated. The powders adopted the α-NaFeO2 structure with almost none of the well-known Li/Ni cation disorder. The analysis of the magnetic properties in the paramagnetic domain agrees with the combination of Ni2+ (S = 1), Co3+ (S = 0) and Mn4+ (S = 3/2) spin-only values. X-ray analysis of the chemically delithiated LiyNi0.2Mn0.2Co0.6O2 reveals no structural transition. The process of lithium extraction from and insertion into LiNi0.2Mn0.2Co0.6O2 was discussed on the basis of ex situ EPR experiments and magnetic susceptibility. Oxidation of Ni2+ (S = 1) to Ni3+ (S = 1/2) and to Ni4+ (S = 0) was observed upon lithium removal. |
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