A Study on the Electrochemical Properties of PEO-Carbon Composite Polymer Electrolytes for Lithium/Sulfur Battery

摘要

In this study, we investigated ionic conductivities of the electrolytes and cycle performances of Li/S cells using the electrolyte. (PEO)_(10)LiCF_3SO_3 composite polymer electrolyte(CPE) containing carbon powders and Brij dispersant was prepared by ball milling for 12hr. The 5wt% carbon powders having high surface area (～ 80~2 m /g) was added into the (PEO)_(10)LiCF_3SO_3 electrolyte. To get a well-dispersed structure, Brij dispersant was also added into the (PEO)_(10)LiCF_3SO_3-5wt%Carbon electrolyte. Li/CPEs/50wt%S cells showed initial discharge capacities of between 1,250 and 1,413 mAh/g-sulfur with current density of 100 mA/g-sulfur at 80 ℃. These results led us to conclude that the dispersants added into the CPE improved the initial discharge capacities and cycle performances.