传统的石墨负极已经不能满足锂离子电池对高能量密度的需求。采用电化学插层-剥离法得到的石墨烯对铁氧化物负极进行包覆改性，石墨烯表面被部分氧化，拥有类似于氧化石墨烯的功能性，可以和Fe³⁺通过静电吸附完成表面自组装；而且其表面缺陷少、导电性良好，是制备这类复合材料极佳的备选材料；同时，探讨了不同制备条件对石墨烯堆叠效应的影响。结果表明，冷冻干燥可以一定程度上抑制石墨烯堆叠现象的发生，从而增强复合材料的电化学性能。该负极材料在1 A/g的大电流密度下经过350次长循环后仍能保持603 mAh/g的比容量，远高于现在的石墨负极（372 mAh/g），具有优异的循环稳定性。

To explore new anode materials for lithium ion battery,graphene prepared by an electrochemical exfoliation method is used to modify and coat iron oxide anode.The surface of graphene is partly oxidized,which contains some oxygen-containing functional groups that can combine with Fe³⁺ in the solution through an electrostatic self-assembling way.Meanwhile,the stacking phenomenon between graphene sheets in different conditions is studied,and it is found that freeze drying can prevent graphene sheets from stacking,leading to a better electrochemical performance of the composite.The final product remains an excellent reversible capacity of 603 mAh·g^-1 after 350 cycles at a current density as high as 1 A·g^-1,which is superior to the 372 mAh·g^-1 of graphite anode.The excellent performance,eco-friendliness and low cost of this composite indicate its great potential as anode material for lithium ion batteries.