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The spherical-graphite/Fe 3 O 4 composite has been successfully fabricated by a simple two-step synthesis strategy. The oxygenous functional groups between spherical-graphite and Fe 3 O 4 benefit the loading of hollow Fe 3 O 4 nanospheres. All of the composites as anodes for half cells show higher lithium storage capacities and better rate performances in comparison with spherical-graphite. The composite containing 39 wt% of hollow Fe 3 O 4 nanospheres exhibits a high reversible capacity of 806 mAh g -1 up to 200 cycles at 0.5 A g -1 . When cycled at a higher current density of 2 A g -1 , a high charge capacity of 510 mAh g -1 can be sustained, even after 1000 long cycles. Meanwhile, its electrochemical performance for full cells was investigated. When matching with LiCoO 2 cathode, its specific capacity can remain at 137 mAh g -1 after 100 cycles. The outstanding lithium storage performance of the spherical-graphite/Fe 3 O 4 composite may depend on the surface modification of high capacity hollow Fe 3 O 4 nanospheres. This work indicates that the spherical-graphite/Fe 3 O 4 composite is one kind of prospective anode material in future energy storage fields.

Fe3O4 Hollow Nanosphere-Coated Spherical-Graphite Composites: A High-Rate Capacity and Ultra-Long Cycle Life Anode Material for Lithium Ion Batteries