▎ 摘　　要

High crystalline 3D cross-linked graphene nanofibers (3DCGNs) were self-assembled from graphene oxide at high temperature. SEM and TEM tests show that the 3DCGNs have solid-core structure with a diameter less than 100 nm. The layers of graphene are arranged in order, with higher crystallinity. The material served as a negative electrode for lithium ion battery and exhibited excellent electrochemical properties, such as high first Coulombic efficiency (72. 4%) and storage lithium capacity (692. 7 mA . h/g at 0. 1C), good rating performance (373. 3 mA . h/g at 20C) and outstanding cycling stability (capacity retention of 84. 1% after 1000 cycles) and so on. This research also adds new ideas for the preparation of graphene-based electrode materials.