Preparation and electrochemical performance of carbon nanotubes/graphene oxide/sulfur complex cathode material

Abstract

Three-dimensional (3D) hierarchical CNTs/GO/S ternary composites were prepared by solution-based reaction-deposition, using graphene oxide (GO) and carbon nanotubes (CNTs) as precursors. Scanning electron microscopy (SEM) and transmission electron microscope (TEM) indicated a uniform S coating on CNTs/GO which arose because of the large GO specific surface area. CNTs interspersed between the GO layers to form a 3D porous structure. Constant current charge-discharge tests showed that CNTs/GO/S composites had a high discharge capacity and excellent cycling stability, and delivered a high initial discharge capacity of 904 mAh·g-1 at 1C rate. After 50 cycles at the same rate, the reversible capacity remained at 578 mAh·g-1. © Editorial office of Acta Physico-Chimica Sinica.