Design a Comprehensive Experiment of Physical Chemistry for Preparation and Properties of FeSe/C Nanofibers as Anode Materials for Lithium Ion Batteries
This paper designs a comprehensive physical chemistry experiment on the preparation and performance of FeSe/C nanofibers as anode electrode materials for lithium-ion batteries.FeSe as anode materials has the advantages of high theoretical specific capacity,abundant resources and environmental friendliness.However,its poor conductivity and large volume changes during charge-discharge processes limit its development and practical application.In this paper,FeSe/C nanofibers have been prepared by electrospinning followed by annealing.The structure and morphology of the materials are characterized by X-ray diffraction(XRD),Raman spectroscopy(Raman),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The lithium/potassium storage properties of the materials are studied by constant current charge discharge test,and cyclic voltammetry(CV).The results show that FeSe/C nanofibers have a single crystal phase and a unique one-dimensional nanofiber structure,and the FeSe nanoparticles are uniformly distributed in the carbon nanofibers with a diameter of about 200nm.The FeSe/C nanofibers annealed at 650℃show excellent electrochemical properties.In the lithium-ion half cell,the specific capacity of FeSe/C nanofibers electrode is 661 mAh/g after 300 cycles at 1000 mA/g,and it still shows a capacity of 335 mAh/g at 5000 mA/g.
physical chemistry experimentlithium ion batteriesanode materialsFeSe
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