Preparation Of Fe₃O₄@C Nano-composites For High Performances Lithium Ion Batteries Anode Materials

ferroferric oxide?Fe₃O₄?as a lithium ion battery anode material,due to its poor conductivity,the volume of the expansion process during the expansion of the stress caused by the activation material cracking powder,as well as its separation from the collector,seriously affected the iron oxide anode material of the electrochemical performance of the stability.Therefore,in order to solve the existing problems,this paper has successfully constructed different composite nanostructures of ferric oxide and carbon materials,and improves the electrochemical performance of ferric oxide by using the excellent conductivity and electrochemical stability of carbonaceous materials Stability,mainly reflected in two aspects.Firstly,the surface of the nano-gold oxide nanoparticles was chemically modified and positively charged,and the negatively charged multi-walled carbon nanotubes were combined to obtain iron oxide and multi-walled carbon nanotubes?MWCNTs?by electrostatic self-Mix the solution evenly.The sandwich lamellar structure of ferroferric oxide / multiwalled carbon nanotubes / reduction graphene oxide?r-GO?was prepared by vacuum suction filtration.The carbon tetrachloride nanospheres are confined in a three-dimensional conductive structure composed of multi-walled carbon nanotubes and reduced graphene,while carbon materials with pliable properties are well absorbed in the process of electrochemical cycling The stability of the overall electrode is ensured by the stress generated by the volume change.Charge capacity of 200 mAg-1,100 cycles,its capacity can be maintained at720 m Ahg-1.Even after the current increases to 3200 mAg-1,the capacity can be maintained at 420 m Ahg-1 after 300 cycles.It is shown that the Fe₃O₄@MWCNTs/r-GO sandwich laminated structure has stable electrochemical performance.In addition,due to the expansion of the volume of iron oxide in the charge and discharge process will destroy the carbon structure on the surface,resulting in the gradual decline in electrochemical performance.?Fe₃O₄@C?structure with hollow structure of ferric oxide and carbon was prepared by electrospinning.Among them,the excess space in the nanotubes can be provided to the volume expansion of the iron oxide to eliminate the destruction of the surface-coated carbon layer due to the volume expansion.The composite electrode material is stable at 600 mAhg-1 after 100 cycles of 0.15 C charge and discharge current density.Through the composite of carbon tetrachloride nanomaterials and carbon materials,it is possible to construct an anode material of lithium ion battery with stable electrochemical performance,which effectively solves the defects of the existence of iron oxide,which is beneficial to the active material the use of.