Activated carbon aerogels with high bimodal porosity for lithium/sulfur batteries

作者：Jiang, Shaofeng; Zhang, Zhian^*; Qu, Yaohui; Wang, Xiwen; Li, Qiang; Lai, Yanqing; Li, Jie

来源：Journal of Solid State Electrochemistry, 2014, 18(2): 545-551.

DOI：10.1007/s10008-013-2290-1

• Lithium-sulfur batteries
• KOH activation
• Sulfur-activated carbon aerogels composites
• Chemical deposition

Activated carbon aerogels (ACAs) with high bimodal porosity were obtained for lithium/sulfur batteries by potassium hydroxide (KOH) activation. Then sulfur-activated carbon aerogels (S-ACAs) composites were synthesized by chemical deposition strategy. The S-ACAs composites were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy, and N-2 adsorption/desorption measurements. It is found that the activated carbon aerogels treated by KOH activation presents a porous structure, and sulfur is embedded into the pores of the ACAs network-like matrix after a chemical deposition process. The Li/S-ACAs (with 69.1 wt% active material) composite cathode exhibits discharge capacities of 1,493 mAh g(-1) in the first cycle and 528 mAh g(-1) after 100 cycles at a higher rate of C/5 (335 mA g(-1)). The S-ACAs composite cathode exhibits better electrochemical reversibility, higher active material utilization, and less severe polysulfide shuttle than S-CAs composite cathode because of high bimodal porosity structure of the ACAs matrix.

• 出版日期2014-2
• 单位中南大学