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Structural, magnetic and electrochemical properties of LiNi0.5Mn0.5O2 as positive electrode for Li-ion batteries |
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| Authors: | A Abdel-Ghany F Gendron CM Julien |
| Affiliation: | a Institut des Nano-Sciences de Paris, CNRS UMR7588, Université Pierre et Marie Curie, 140 rue de Lourmel, 75015 Paris, France b Institut de Recherche d’Hydro-Québec, 1800 boul. Lionel-Boulet, Varennes, Que., Canada J3X 1S1 c Département MIPPU, CNRS, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France |
| Abstract: | The layered LiNi0.5Mn0.5O2 was synthesized by wet-chemical method and characterized by X-ray diffraction and SQUID magnetometry. The powders adopted the α-NaFeO2 structure. The ferromagnetism observed below Tc = 140 K is attributed to the linear Ni2+(3a)-O-Mn4+(3b)-O-Ni2+(3a) magnetic paths, from which we derive that 7% of the nickel occupies the (3a) Wyckoff position in place of Li, constituting a Ni2+(3a) defect. The analysis of the magnetic properties in the paramagnetic phase in the framework of the Curie-Weiss law agrees well with the combination of Ni2+ (S = 1) and Mn4+ (S = 3/2) spin-only values. Results of structural and magnetic properties of chemically delithiated sample are consistent with the electronic state Mn4+/Ni4+ and the high-spin configuration for Ni4+ ions. The LiNi0.5Mn0.5O2 electrode sintered at 900 °C delivers a capacity 166 mAh/g at 0.1C rate which is capacity retention of 95%. |
| Keywords: | Lithium-ion batteries Layered compounds Magnetic properties Chemical delithiation |
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