(3) Electrochemical data illuminated that the first discharge specific capacity is 991。4 mA h g-1 a current density of 0。5 A g-1 as lithium-ion battery electrode materials。 The reversible capacity still retains 577。2 mA h g-1 after 50 cycles, and the sample capacity retention rate maintain in 58。2%。 As supercapacitor electrode materials, the specific capacitance of Fe3O4@C core-shell structures is about 50。0 F g-1 for the first cycle at a current density of 0。5 A g-1, and still retains 49。5 F g-1 after 500 cycles。 It exhibits better cycling stability。
Keywords: Fe3O4@C composite,electrochemical properties, Lithium ion battery