Nanoporous carbon microspheres as matrix of sulfur to prepare sulfur/carbon cathode material for lithium-sulfur battery

作者：Xu, Shuntao; Zhang, Zhengfu^*; Li, Junpeng^*; Wu, Tianya; Xue, Yuan

来源：Ionics, 2018, 24(9): 2509-2521.

DOI：10.1007/s11581-017-2383-4

• Lithium-sulfur battery
• Carbon microsphere
• Sulfur/carbon cathode material
• CO2 activation

A high specific surface area (2798.8 m(2) g(-1)) of nanoporous carbon microsphere (NPCM) is prepared by activated carbon microsphere in hot CO2 atmosphere, which is used as matrix material of sulfur to prepare NPCM/sulfur composite cathode material by a melt-diffusion method. The NPCM/sulfur composite cathode material with the sulfur content of 53.5% shows high discharge capacity; the initial discharge capacity is 1274 mAh g(-1) which maintains as high as 776.4 mAh g(-1) after 50 cycles at 0.1 C current. At high current density of 1 C, the NPCM/sulfur cathode material still shows initial discharge capacity of 830.3 mAh g(-1), and the reversible capacity retention is 78% after 50 cycles. To study the influence of different sulfur content of NPCM/sulfur cathode material to the performance of Li-S battery, the different sulfur content of NPCM/sulfur composite cathode materials is prepared by changing the thermal diffusion time and the ratio of sulfur powder to NPCM. The performance of NPCM/sulfur cathode material with different sulfur content is studied at a current of 0.1 C, which will be very important to the preparation of high-performance sulfur/carbon cathode material with appropriate sulfur content.

• 出版日期2018-9
• 单位昆明贵金属研究所; 昆明理工大学