A mesoporous carbon-sulfur composite as cathode material for high rate lithium sulfur batteries

作者：Choi Hyunji; Zhao Xiaohui; Kim Dul Sun; Ahn Hyo Jun; Kim Ki Won; Cho Kwon Koo^*; Ahn Jou Hyeon

来源：Materials Research Bulletin, 2014, 58: 199-203.

DOI：10.1016/j.materresbull.2014.03.023

• Composite
• Chemical synthesis
• Electrochemical measurements
• Electrochemical properties
• Energy storage

Sulfur composite was prepared by encapsulating sulfur into CMK-3 mesoporous carbon with different heating times and then used as the cathode material for lithium sulfur batteries. Thermal treatment at 300 degrees C plays an important role in the sulfur encapsulation process. With 20 h of heating time, a portion of sulfur remained on the surface of carbon, whereas with 60 h of heating time, sulfur is confined deeply in the small pores of carbon that cannot be fully exploited in the redox reaction, thus causing low capacity. The S/CMK-3 composite with thermal treatment for 40 h at 300 degrees C contained 51.3 wt.% sulfur and delivered a high initial capacity of 1375 mA h g(-1) at 0.1 C. Moreover, it showed good capacity retention of 704 mA h g(-1) at 0.1 C and 578 mA h g(-1) at 2 C even after 100 cycles, which proves its potential as a cathode material for high capability lithium sulfur batteries.

• 出版日期2014-10