▎ 摘　　要

A two-step hydrothermal method is reported here for the synthesis of a sulfur-graphene hybrid material. The scanning electron microscopy, X-ray diffraction and Raman spectroscopy characterizations have confirmed that this method can produce a homogeneous sulfur coating on the graphene surface and prevent the graphene sheets from aggregation simultaneously to form a three dimensional carbon network. When tested as a cathode in lithium sulfur batteries, the hybrid material exhibits a high discharge capacity and good cycling stability at a current density of 1A/g, even as the sulfur content reaches an extremely high level (75.2% wt). Its excellent electrochemical performance can be attributed to the stable carbon skeleton formed by the monolayer graphene sheets and the good contact between sulfur and graphene. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.048208jes] All rights reserved.