Ghosh, Sourav and de Donder, Timothy and Gunnarsson, Klas and Kumar, V. Kiran and Martha, Surendra K. and Svedlindh, Peter and Kessler, Vadim G. and Seisenbaeva, Gulaim A. and Pol, Vilas G.
(2021)
Investigating the stable operating voltage for the MnFe2O4 Li-ion battery anode.
Sustainable Energy & Fuels, 5 (6).
pp. 1904-1913.
ISSN 2398-4902
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Abstract
Template-free synthesis of MnFe2O4nanopowder is carried out by co-precipitation in a basic medium, evaluating the effects of cation ratio and reaction temperature on the phase composition crystallinity of the resulting powder. Single-phase samples of the target spinel are obtained at the stoichiometric Mn : Fe = 1 : 2 ratio under reflux conditions (100 °C), as confirmed by X-ray diffraction (XRD) and Fourier Transformed Infrared (FTIR) spectroscopy. Transmission electron microscopy (TEM) images confirmed that nanostructured MnFe2O4particles are obtained, which is further supported by Debye-Scherrer calculations from XRD data and by AFM measurements. The produced oxide demonstrated considerable thermal stability according to TGA data. Magnetic characteristics are strongly dependent on the content of magnetic phase and phase composition, achieving a maximum of 54 emu g−1for single-phase stoichiometric MnFe2O4. Further, the electrochemical stability of this material as the anode is investigated in Li-ion batteries (LIBs). When the MnFe2O4electrode is operated in the potential window of 0.01-3.0 V, the reversible capacity is enhanced by almost 45% (802 mA h g−1) after the 100thcycle with reference to the 2ndcycle reversible capacity (548 mA h g−1). Methodically dQ/dVplots are analyzed and compared to understand processes behind the evolution of extra capacity beyond its theoretical limit. Further, the upper cut-off potential is tuned to identify a stable operating potential window for the MnFe2O4anode in LIBs. ©
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