Double-shelled hybrid MgFe2O4/Fe2O3 hollow microspheres as a high-capacity anode for lithium-ion batteries

다국어 초록 (Multilingual Abstract)

Ternary metal oxides Fe2O3 and MgFe2O4 have attracted considerable attention as lithium anode materialsowing to their high theoretical capacities, environmental friendliness, and low cost; however, theirrapid capacity decay and large volume expansion inhibit their lithium storage performance. Herein, wesynthesize hybrid MgFe2O4/Fe2O3 hollow microspheres (MFO/FO-HS) hydrothermally, via the polyolreaction of ethylene glycol, followed by calcination at different temperatures. The surface morphologywas tuned by adjusting the calcination temperature, assisted by inward and outward Ostwald ripening.
X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and thermogravimetricanalysis were performed to investigate the physio-chemical properties of the prepared samples. Thesample calcined at 450 C exhibited an excellent electrochemical performance and retained a reversiblecapacity of 1390 mAh g1 after 160 cycles, indicating the significant role of calcination temperature intuning the structural and electrochemical properties of anode materials. The double-shelled hollowmicrospheres inhibit rapid capacity decay and prevent severe volume expansion during the electrochemicalprocess. This work opens new paths toward constructing an electrode material with a high electrochemicalperformance.

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