An Attempt to Utilize Hard Magnetic BaFe12O19 Phase as a Cathode for Magnesium Batteries
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The sluggish Mg2+ kinetics in host materials is a big challenge that hinders realizing practical magnesium batteries. To overcome this problem, designing and testing a new system as a fast Mg2+ insertion cathode is a promising solution. Herein, hexagonal barium ferrite BaFe12O19 as cathode for magnesium ion batteries is presented for the first time. The M ferrite phase BaFe12O19 is synthesized via the co-precipitation method. X-ray diffraction confirms single hexagonal ferrite phase with lattice constants a = b = 5.49 Å and c = 23.8 Å. Transmission electron microscopy images reflect high porosity with rough surfaces for the ferrite particles. The magnetic study shows that present hexaferrite has a high value of coercivity (5.1 KOe) and saturation magnetization (54 emu/gm). The electrical conductivities are studied as a function of temperature and frequencies. The multi-conduction mechanisms and multilyers structures present in these types of ferrite, make it acceptable for Mg2+ intercalation. The as-prepared BaFe12O19 electrode delivers high initial discharge capacity of 170 mAh g−1. The BaFe12O19 is a promising cathode material for magnesium-ion battery applications.
KeywordsHard magnetic barium ferrite cathode magnesium battery
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This work is partially financially supported by the Support Development of Scientific Research Centre of Benha University (SDSRC) (Grant No. 1076) and Science Technology Development Fund (Grant No. 12564).