Activated carbon aerogels with high bimodal porosity for lithium/sulfur batteries |
| |
Authors: | Shaofeng Jiang Zhian Zhang Yaohui Qu Xiwen Wang Qiang Li Yanqing Lai Jie Li |
| |
Institution: | 1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China 2. Engineering Research Center of High Performance Battery Materials and Devices, Research Institute of Central South University in Shenzhen, Shenzhen, 518057, China
|
| |
Abstract: | 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 N2 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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|