Effect of Acetylene Black Coating on Properties of Lithium-Sulfur Batteries

作者：Yang Xue-Bing^*; Hu Xiao-Na; Sun Xu

来源：CHINESE JOURNAL OF INORGANIC CHEMISTRY, 2021, 37(12): 2203-2208.

DOI：10.11862/CJIC.2021.248

• lithium-sulfur batteries
• sulfur electrode
• acetylene black
• cycle properties

Cyclic discharge stability of lithium-sulfur batteries is relatively low. Herein, a method of low cost has been adopted to improve properties of lithium-sulfur batteries. A coating of acetylene black has been prepared on the surface of sulfur electrodes. The morphology of materials and properties for batteries have been tested. The results indicate that the sulfur adheres to the surface of acetylene black particles in sulfur-acetylene black composite with sulfur content (mass fraction) of 70%. The acetylene black coating with thickness of about 15 mu m has been prepared on the surface of lithium electrodes. The voltage for oxidation reaction of sulfur electrodes with acetylene black coating was lower than that of sulfur electrodes. Acetylene black coating is helpful in oxidation reaction of sulfur electrodes. The aggregation degree of active materials for sulfur electrodes with acetylene black coating was lower than that for sulfur electrodes. The discharge specific capacity and cyclic discharge stability of sulfur electrodes with acetylene black coating were higher than those of sulfur electrodes. After 150 cycles of charge and discharge, the discharge specific capacity of sulfur electrodes with acetylene black coating was 894 mAh.g(-1).