Abstract
Firstly, ε-MnO2 films with good adhesion and high surface area were electrolytically deposited on platinum plates. After being soaked for 48 h in a 0.1 mol L−1 LiOH aqueous solution, these oxide films were directly converted to the LiMn2O4 spinel by microwave calcination using very short irradiation times (t ir) of 3, 4, or 5 min. As inferred from XRD data, clearly the crystalline LiMn2O4 spinel in a single phase can be obtained even at t ir = 3 min. The voltammetric profiles for all obtained Pt/LiMn2O4 electrodes presented the characteristic peaks for the lithium-ion insertion-extraction processes in the spinel structure. For the LiMn2O4 spinel obtained using t ir = 3 min, the diffusion coefficient associated to those processes was estimated as equal to 1.1 × 10−11 cm s−1. From the charge-discharge tests, the specific capacity for this material was about 80 mA h g−1 at C/10. Therefore, the proposed methodology made possible to directly produce Pt/LiMn2O4 electrodes, without the need of using conductivity enhancers or binders for the attachment of the oxide film to the current collector.
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Financial support and scholarships from the Brazilian funding agencies CNPq and CAPES are gratefully acknowledged.
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Davoglio, R.A., Irikura, K., Biaggio, S.R. et al. Direct conversion of electrodeposited nanocrystalline ε-MnO2 into LiMn2O4 by microwave calcination. J Solid State Electrochem 20, 2019–2027 (2016). https://doi.org/10.1007/s10008-016-3212-9
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DOI: https://doi.org/10.1007/s10008-016-3212-9