▎ 摘 要
Si/carbon composites are attractive anode materials for rechargeable Li-ion batteries (RLIBs), which combine the advantages of Si and graphene. Designing special Si/carbon structure with intimate contact interface and abundant void space for fast ion transmission is an effective strategy for enhancing cyclability and rate perfor-mance of the electrode materials. Inspired by the structure of fishnet, here we fabricate a binder-free and self -standing Si@porous-graphene (Si@PGN(60)) composite with nano silicon particles encapsulated in porous graphene sheets. The obtained Si@PGN(60) sample exhibits many favourable features for high performance Si/carbon anodes, including improved Si/graphene contact interface, and abundant void space for fast ion transmission. Tanks to the unique structure, the resultant Si@PGN60 anode presents remarkably improved capacity reaching 1839.9 mA h g(-1) at 300 mA g(-1), and excellent cycling performance (734 mA h g(-1) at a high current density of 3000 mA g(-1)).