Metal etching method for preparing porous graphene as high performance anode material for lithium-ion batteries

Porous graphene (PG) has attracted tremendous attention and research interest due to its unique porous structure in combination with inherent properties of graphene. Herein, we report an efficient strategy for bulk preparation of PG by metal etching. The size of the pores and pore density in the basal plane of graphene sheets could be readily controlled by the reaction time and the ratio of the reactants. The PG electrode tested as anode materials exhibited high electrochemical performance with a first charge specific capacity of 933 mAh g−1 at 50 mA g−1, good cycling stability and demonstrated excellent rate performance than those of reduced graphene oxide.