Sandwich-like mesoporous graphene@magnetite@carbon nanosheets for high-rate lithium ion batteries

• Sandwich-like GS@Fe3O4@C nanosheets with 2D nanostructure have been synthesized by one-step solvothermal treatment.
• The GS@Fe3O4@C nanosheets present minor aggregation, uniform mesoporous configuration and enhanced conductivity.
• The GS@Fe3O4@C nanosheets is a proper material for lithium storage with high rate capacity and excellent cycle durability.

Sandwich-like mesoporous GS@Fe3O4@C nanosheets with a 2D nanoarchitecture have been successfully synthesized by one-step solvothermal treatment. Such type of 2D nanoarchitecture is made up of a number of Fe3O4 nanoparticles uniformly grown on a graphene sheet and an even amorphous carbon layer covering on their surface. The Li-cycling properties of GS@Fe3O4@C nanosheets have been evaluated by galvanostatic discharge-charge cycling and impedance spectroscopy. Results indicate that the GS@Fe3O4@C nanosheets with about 5 wt % of graphene content provides a very high discharge capacity of 913.2 mAh g−1 at a current densities of 200 mA g−1 after 100 cycles and reveals a stable discharge capacity of 483.2 mAh g−1 at a rate of 1600 mA g−1.

A new type of 2D nanoarchitecture, Sandwich-like mesoporous GS@Fe3O4@C nanosheets, have been successfully prepared by a facile approach. It can be used as anode for high-rate lithiumion batteries.Figure optionsDownload as PowerPoint slide