MgFe_2O_4 nanoparticles as anode materials for lithium-ion batteries

摘要

Magnesium ferrite nanoparticles are prepared by a sol-gel method and characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The electrochemical behavior as anode materials of lithium-ion rechargeable batteries is investigated by galvanostatic discharge/charge measurements and cyclic voltammetry. The average diameter of the MgFe_2O_4 particles is around 11 nm. MgFe_2O_4 shows better performance than the traditional carbon material. The initial discharge specific capacity under the current density of 180 mA g~(-1) reaches 1404 mAh g~(-1), which is higher than that reported in literatures. After 50 cycles, the discharge and charge capacity of the MgFe_2O_4 under 90 mA g~(-1) is 493 and 473.6 mAh g~(-1), and the irreversible capacity loss is less than 5.2%.