期刊
SOLID STATE IONICS
卷 341, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ssi.2019.115042
关键词
Magnesium ferrite; Anode materials; Li-ion battery
Non-stoichiometric magnesium ferrites (MgxFe2O4) with different deficiency values (x = 0.5, 0.95 and 1) have been prepared applying the sol gel method. The resulting samples have been investigated using X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and X-ray photo-electron spectroscopy (XPS). The influence of Mg-deficiency on the electrochemical properties of magnesium ferrites has been explored. Rietveld analysis of XRD indicated that Mg deficiency causes a redistribution of cations among the tetrahedral and octahedral sites associated with the existence of vacancies and a reduction in both lattice parameter and grain size. XPS analysis has revealed the existence of iron ions (Fe3+) only and confirmed the existence of deficiency of both magnesium Mg2+ and oxygen O2- ions. The electrochemical measurements indicated improved performance; Mg-deficiency yields better cyclic performance during the first 50 cycles, however, the specific discharge capacity of Mg0.5Fe2O4 cell is dramatically decreased during the subsequent 50 cycles.
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