▎ 摘　　要

Silicon-carbon composites, which exhibit the advantages of both carbon and silicon materials, are regarded as the most promising anode for lithium ion battery. In this work, a composite of 3D graphene-like nanosheets/silicon wrapped by catalytic graphite (G-3DGNs-Si) was prepared via a chemical oxidation-thermal expansion strategy and high-temperature sintering method. The obvious interlinked 3D-layered spaces in 3DGNs arranged orderly can uniformly accommodate silicon nanoparticles (SiNPs). 3DGNs can relieve the volume expansion and improve the electrical conductivity of SiNPs. In addition, the catalytic graphite evenly coated on the 3DGNs-Si can further improve electrochemical performance. The G-3DGNs-Si composite anode can achieve 90% reversible capacity retention (957.2 mAli g(-1)) at 0.2 A g(-1) after 100 cycles (78.9% after 300 cycles). The method is effective and easy to operate. This work provides a novel idea for designing silicon-carbon composites.