Physical properties of LiMn2O4 spinel prepared at moderate temperature |
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| Authors: | S. Chitra P. Kalyani T. Mohan M. Massot S. Ziolkiewicz R. Gangandharan M. Eddrief C. Julien |
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| Affiliation: | (1) Lithium Batteries Division, Central Electrochemical Research Institute, 630006 Karaikudi, India;(2) Laboratoire des Milieux Désordonnés et Hétérogènes, UMR-CNRS 7603, Université Pierre et Marie Curie, 4 place Jussieu, F-75252 Paris cedex 05, France;(3) Laboratoire de Minéralogie et Cristallographie, Université Pierre et Marie Curie, 4 place Jussieu, F-75252 Paris cedex 05, France |
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| Abstract: | A moderate-temperature method of preparation of the spinel LiMn2O4 was developed around 500 °C. Physical features of the products were identified by X-ray photoelectron spectroscopy, X-ray diffractometry, Raman scattering and FTIR spectroscopy. The electronic conductivity of LiMn2O4 has been studied as a function of annealing temperature. The product LiMn2O4 is identified as a micron-sized powder and analysis of the local environment is in good accordance with the classical structural model of Fd3m space group. LiMn2O4 exhibits an electrical conductivity of 1.9×10−5 S/cm at room temperature with an activation energy of 0.16 eV which corresponds to an electron hopping mechanism between the two charge states of Mn3+ and Mn4+ ions. A first-order phase transition is observed at 292 K. |
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