Fe oxides as negative electrodes for rechargeable batteries: long vs short range structure
Fe2O3 is evaluated as conversion anode material for Na ion batteries but presents some drawbacks: poor electronic transport properties and large volume changes during charge/discharge processes. The strategy adopted here is the production of Fe2O3 nanofibers doped with Mg, Mg/Ti, Ge. The modification of the morphology can improve the cyclability; the doping with aliovalent cations can modify the crystal and electronic structure. Our preliminary electrochemical tests are promising for the Ge composition; XAS data have already been acquired on the Fe-,Ti-, and Ge- edge and evidence significant differences in the samples’ structure. At the same time, the long-range order on these materials is unclear as the investigation and resolution of different Fe-O polymorphs with the use of XRD techniques is hardly feasible. The collected XRD patterns shows significant differences but they are compatible with different structural models. For this reason, we apply for the EASY Access program to collect room temperature data of the three samples (0.5g each) on the D20 beamline ensuring suitable condition to investigate the crystal structure, substitution, occupancies of these oxides.
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FERRARA Chiara and RITTER Clemens. (2020). Fe oxides as negative electrodes for rechargeable batteries: long vs short range structure. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-641
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