▎ 摘　　要

Novel sandwich-structured silicon-based anodes have been prepared to inhibit the fragmentation of silicon electrodes typically caused by the large volume changes that occur during charge/discharge processes. An electrostatic self-assembly method and hydrothermal dehydration are used to introduce a reduced graphene oxide layer (rGO) on the surface of silicon/carbon nanofibers (Si/CNFs), which prevent the exfoliation of nano-Si from the electrode bulk to the liquid electrolyte, reduce the electric contact loss, stabilize the electrode's structural integrity, and improve electrochemical conductivity. The Si/CNFs@rGO exhibit superior electrochemical performance as an anode, retaining a high specific capacity of 1055.1 mAh g (1) up to 130 cycles at 0.1 Ag (1), with slight capacity loss. The Si/CNFs@rGO electrode also demonstrates outstanding rate behavior with a reversible capacity of 358.2 mAh g (1) at 5 Ag (1) Results indicate that the graphene layer significantly improves the electrochemical performance of the silicon/carbon nanofiber electrode. (C) 2016 Elsevier Ltd. All rights reserved.