Partially substituted lithium manganese oxides as 3 V cathode materials for secondary lithium batteries |
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| Authors: | S Franger S Bach J P Pereira-Ramos N Baffier |
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| Institution: | (1) Laboratoire d’Electrochimie, Catalyse et Synthèse Organique, UMR CNRS 7582, ISCSA, 2 rue Henri-Dunant, 94320 Thiais, France;(2) Laboratoire de Chimie Appliquée de l’Etat Solide, UMR CNRS 7574, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France;(3) Present address: LPCES, UMR CNRS 8648, ICMMO, Université Paris XI, 91405 Orsay Cedex, France |
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| Abstract: | Low temperature synthesis and electrochemical properties of partially substituted lithium manganese oxides are reported. We
demonstrate various metallic cations (Cu2+, Ni2+, Fe3+, Co3+) can be incorporated in the 3 V layered cathodic material Li0.45MnO2.1. New compounds Li0.45Mn0.88Fe0.12O2.1, Li0.45Mn0.84Ni0.16O2.05, Li0.45Mn0.79Cu0.21O2.3, Li0.45Mn0.85Co0.15O2.3 are prepared. These 3 V cathode materials are characterized by the same shape of discharge-charge profiles but different
values of the specific capacity, between 90 mAh g−1 and 180 mAh g−1. The best results in terms of capacity and cycle life are obtained with the selected content of 0.15 Co per mole of oxide,
as the optimum composition. The high kinetics of Li+ transport in Li0.45Mn0.85Co0.15O2.3 compared to that in the Co-free material is consistent with a substitution of Mn(III) by Co(III) in MnO2 sheets. |
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| Keywords: | Lithium batteries Soft chemistry Manganese oxides Partial substitution |
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