Fabrication of Hollow MgFe₂O₄ Microspheres for High Performance Anode of Lithium Ion Battery

摘要

In this work, spinel MgFe2O4 hollow structural microspheres were fabricated through anenvironmental friendly hydrothermal carbon templating approach with subsequently annealing processin air, where carbon spheres plays as template to create void space, and that promote metal sourceloading into colloidal carbon sphere. The resultant hollow MgFe2O4 sphere possess excellent texturalproperties of a large void space size (50-80nm) and tailored shell thickness(25-35nm). The spinelMgFe2O4 hollow structural microspheres used as an anode material for rechargeable lithium-ionbattery possesses a high initial discharge specific capacity of 616.3 mAh g-1 at a stable current densityof 500 mAh g-1 and the capacity retention of 559.9 mAh g-1 by 18 cycles. The excellentelectrochemical performances of the spinel MgFe2O4 hollow structural microspheres may beassociated with the special porous hollow structures, which deliver an easy Li+ diffusion pathway andfacilitate charge transfer and alleviate the volume variation and diminishes polarization in cycling.