▎ 摘　　要

The electrospun Co3O4 nanotubes encapsulated by graphene membrane are successfully synthesized via a novel and efficient method. The Co3O4 nanotubes with the diameter of 200 nm are prepared by electrospinning combined with sintering process. Graphene is wrapped on the charge-modified surface of Co3O4 nanotubes by the mutual electrostatic interactions. The as-prepared graphene/Co3O4 nanotubes are applied as anode materials for lithium-ion batteries and show the improved rate capacities (up to 430.9 mAh g(-1) at the current density of 1600 mA g(-1)) and excellent rechargeable stability (961.4 mAh g(-1) at the current density of 100 mA g(-1) after 80 cycles). The existence of graphene membrane not only decreases the lithium ion transport path due to serving as the additional transport channel, but also provides the elastic buffer to avoid the agglomeration of the Co3O4 nanotubes. The nanotubes located in the graphene could effectively prevent the agglomeration of graphene membranes, and consequently keep their high active surface area. The complementary and synergistic effect of Co3O4 nanotubes and graphene makes a great contribution to the outstanding electrochemical properties. The graphene/Co3O4 nanotubes composites were applied as anode materials and shown excellent electrochemical performance.