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dc.contributor.authorGracia, Mercedes-
dc.contributor.authorGancedo, J. R.-
dc.contributor.authorde la Figuera, Juan-
dc.contributor.authorMarco, José F.-
dc.identifier.citation5th Mediterranean Conference on the Applications of the Mössbauer Effect / 41st Workshop of the French speaking Group of Mössbauer Spectroscopy (2019)-
dc.descriptionMECAME - GFSM: In honour of Dr Jean-Claude Jumas (Institut Charles Gerhardt, CNRS, University of Montpellier, France), Montpellier, France, 9 to 23 May 2019. -- https://mecame-gfsm2019.irb.hr/ . -- Conferencia invitada-
dc.description.abstractLithium manganese ferrites crystallizing in the spinel structure are good candidates for stable host framework for electrodes in lithium-ion rechargeable batteries because of the abundance and low toxicity of iron and the favorable electrochemical properties of the resulting materials. The spinel structure is very versatile and can acommodate different cations having different oxidation states within its octahedral and tetrahedral sites. Depending on the stoichiometry and/or the preparation method very different cation distributions can be obtained. The performance of the final frameworks in these electrochemical applications is very dependant both on such distributions and the oxidation states of the various cations (as, for example, the presence of different Mnn+/Mn(n+1)+ redox couples) since they can affect strongly the insertion/extraction mechanism of Li ions. In this presentation we will comment on our results on the Li-Fe-Mn-O spinel system cobtained along various years. In particular, through the use of transmission Mössbauer spectroscopy in the 10-298 K temperature range, in-field transmission Mössbauer spectroscopy at 4.2K, X-ray absorption spectroscopy (XANES and EXAFS), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and electrochemical measurements, we will show how different stoichiometries and preparation methods can affect the cation distribution, give place to the formation (or not) of superparamagnetic-like clusters within the spinel structure, give rise to the existence of spin canting or show different electrochemical behaviour against the oxygen reduction reaction. The characterization and determination of all these chemical and structural properties is fundamental to understand the behaviour of such materials in the lithium-ion rechargable batteries field.-
dc.titleMossbauer investigations on lithium manganese ferrites with spinel-related structure-
dc.typecomunicación de congreso-
Appears in Collections:(IQFR) Comunicaciones congresos
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