Abstract
AbstractThe application of Fe3O4as anode material for lithium‐ion batteries is hindered by the capacity fade owing to its enormous volume expansion and the inherent low conductivity. Herein, carbon‐encapsulated Fe3O4nanospheres anchored on carbon nanotubes (Fe3O4/CNTs@C) have been successfully fabricated. The obtained Fe3O4/CNTs@C composites show that numerous Fe3O4nanospheres are held and connected by the CNT network, forming a composite of porous three‐dimensional structure. The unique structure improves the conductivity and structural stability of the Fe3O4/CNTs@C composite. The encapsulation with carbon enhances the contact between Fe3O4nanospheres and carbon nanotubes and shortens the ion‐transport path. As a result, the Fe3O4/CNTs@C delivers a high capacity of 612 mA h g−1at 1 A g−1, even after 200 cycles, and shows a superior rate performance of 523 mA h g−1at 5 A g−1. This work provides a preparation strategy that could be easily applied to other functional materials for energy storage and/or catalysis.
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