Electrospinning Synthesis And Lithium Storage Properties Of Fe₃O₄ And ZnMn₂O₄ Nano-material

Lithium-ion batteries as an electrochemical power source, has been widely used in various fields of life. However, it restricted by the capacity of graphite(372 mA h g-1), can not meet the growing consumer demand. Researchers committed to finding new electrode materials to replace graphite in improving the capacity and cycling life of the electrode. With its unique electrochemical performance, transition metal oxide was treated as promising electrode material. However, the poor conductivity, large volume expansion and other issues restricted its commercial application. Currently, researchers solve the above problems by using nano-materials, structural design, doping and other ways.This paper mainly discusses the use of electro spinning technique for preparing nanoscale transition metal oxides and their composites, which eventually be used as anode for Lithium-ion battery. The main contents are as follows:(1) The Fe3O4/C nanowires was synthesized by electrospinning. The morphology and structure of the material was characterized by SEM, TEM, XRD, TGA, BET, etc. According to the experimental data, it is found that the morphology of the Fe3O4/C nanowires is uniform and continuous, with the length of several micrometer, with the diameter of about 120 nm. The Fe3O4 nanoparticles with the diameter of 5-10 nm were embedded in the amorphous carbon. The initial discharge capacity of the electrode is 876.6 mA h g-1. Even after 100 cycles, the reversible capacity can retain at 508.2 mA h g-1. In addition, it shows excellent rate performance and capacity-recover property. The superior lithium storage capability mainly ascribed to the effective protection structure.(2) Crumpled ZnMn2O4 nanosheets was first fabricated by electrospinning. In this paper, we controlled the morphology by adjust the heating rate during the calcination, and finally synthesized the novel crumpled nanosheets. Based on the experimental data, the probably formation mechanism was proposed. The correctness was finally be testified by thermal gravimetric analysis. According to the electrochemical data, the crumpled ZnMn2O4 nanosheets deliver high capacity, and also show superior cycling stability compared with other ZnMn2O4 reported before. The reversible capability could retain at 461 mA h g-1 even after 500 cycles. The electrode performs good electrochemical property mainly ascribe to its novel structure.