Nano MgFe2O4 synthesized by sol-gel auto-combustion method as anode materials for lithium ion batteries

作者：Yin, Yanhong; Zhang, Bing; Zhang, Xiaoting; Xu, Jingjing; Yang, Shuting^*

来源：Journal of Sol-Gel Science and Technology, 2013, 66(3): 540-543.

DOI：10.1007/s10971-013-2967-z

• Sol-gel auto-combustion
• Lithium-ioninsertion properties
• Ratio
• MgFe2O4

In this work, spinel structure MgFe2O4 nano-crystals were synthesized by sol-gel auto-combustion method. Morphology and structure of the synthesized MgFe2O4 material is characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). And its electrochemical properties were investigated at different active material ratio. Galvanostatic charge/discharge and cyclic voltammograms (CVs) measurements show that the electrode with a ratio of 40:40:20, which is the ratio of active material: super-P carbon (SP): polyvinylidene fluoride (PVDF), presents relatively superior performance with the initial discharge capacity of 1,123 mAh g(-1) and charge/discharge efficiency of 96.7 %. And after 50 cycles, it still maintains at 635 mAh g(-1), which is nearly double that of the other two electrodes with active material ratio of 60:25:15 and 80:15:5. Electrochemical impedance spectra testing shows that the charge transfer resistance (Rct) decreases along with the increasing amount of SP, which is benefit for reducing the polarization and improving the cycling stability of the electrode to a certain extent.

• 出版日期2013-6
• 单位河南师范大学