The preparation and lithium battery performance of core-shell SiO2@Fe3O4@C composite.

Uniform core-shell SiO 2 @Fe 3 O 4 @C composite was prepared by a one-step hydrothermal method by using SiO 2 nanosphere as template. The structure and electrochemical performance of sample were characterized by means of modern analytical techniques. Electrochemical cyclic voltammetry showed that SiO 2 @Fe 3 O 4 @C composite had good electrochemical reversibility and stability. Under the constant current density of 100 mA g −1 , the capacitance of sample still reaches to 140 mA h g −1 after 100 cycles. The superior electrochemical performance of as-prepared SiO 2 @Fe 3 O 4 @C was attributed to the mesoporous carbon layer and Fe 3 O 4 nanoparticles, indicating that SiO 2 @Fe 3 O 4 @C was a kind of superior anode material for lithium-ion battery. Therefore, the SiO 2 @Fe 3 O 4 @C has a promising application in the filed of lithium-ion battery. [ABSTRACT FROM AUTHOR]