Authors: Shaofeng Jiang Zhian Zhang Yaohui Qu Xiwen Wang Qiang Li Yanqing Lai Jie Li
Publish Date: 2013/10/23
Volume: 18, Issue: 2, Pages: 545-551
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 networklike matrix after a chemical deposition process The Li/S–ACAs with 691 wt active material composite cathode exhibits discharge capacities of 1493 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 matrixThe authors thank the financial support of the Strategic Emerging Industries Program of Shenzhen China JCYJ20120618164543322 We also thank the support of the Engineering Research Center of Advanced Battery Materials the Ministry of Education China
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