▎ 摘　　要

The way to solve the sulfur conductive problem is the key to improve the performance of lithium sulfur battery. Nano oxides can not only improve sulfur electrode porosity, but also adsorb more sulphur, in addition play a catalytic role to oxidation reduction reaction of cells, the graphene has a unique two-dimensional structure and excellent physical and chemical properties, very suitable for coating composite containing sulfur materials. This paper was studied on electrical properties of sulfur cathode materials on lithium sulfur batteries, and the influence on sulfur electrochemical performance of C/S composite material, C-S-TiO2 composite material, C-S-TiO2 composite material coated by grapheme. Three composite materials were characterized by used XRD, SEM. The results showed that the specific capacity of C-S-TiO2 composite material coated by grapheme reach to 1366 mAh/g, C/S composite material was 400 mAh/g, while the C-S-TiO2 composite material, the specific capacity up to 966mAh/g. After 20 cycles of charge and discharge, C-S-TiO2 composite material coated by graphene retention rate was 78.9%, while C/S composite material was lower to 62.6%.