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Electrochemical properties of LiMn2O4 films produced by combustion reaction

Lithium manganese oxide powders were prepared via combustion reaction. Structural characterization of the powder using X-ray diffraction and scanning electron microscopy confirmed the formation of a LiMn2O4 nanosized powder. LiMn2O4 films were prepared by spin coating using 80 wt% of oxide, 15 wt% o...

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Published in:Solid state sciences 2004-12, Vol.6 (12), p.1353-1358
Main Authors: FONSECA, Carla Polo, PALLONE, Eliria M. J. A, NEVES, Silmara
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description Lithium manganese oxide powders were prepared via combustion reaction. Structural characterization of the powder using X-ray diffraction and scanning electron microscopy confirmed the formation of a LiMn2O4 nanosized powder. LiMn2O4 films were prepared by spin coating using 80 wt% of oxide, 15 wt% of polyaniline (PAni) as an electronic conductor and 5 wt% of polyvinylidene (PVDF) as a binder in N.N.-dimethyl acetamide. A Coulombic efficiency of 96% confirmed the electrochemical stability of the composite. The variation in impedance as a function of the lithium intercalation/deintercalation process reflected the interaction between the oxide and/or polyaniline particles at a high frequency range, and a diffusion tendency was observed at medium and low frequency ranges. The capacity values of the composite electrodes relative to the LiMn2O4 mass were 178.6/177.5 and 145/140 mAh g-1 for the first and 25th charge/discharge cycles, respectively.
doi_str_mv 10.1016/j.solidstatesciences.2004.07.014
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subjects Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Exact sciences and technology
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Theory of crystal structure, crystal symmetry
calculations and modeling
Transport properties of condensed matter (nonelectronic)
title Electrochemical properties of LiMn2O4 films produced by combustion reaction
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