Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990191 | Journal of Alloys and Compounds | 2018 | 8 Pages |
Abstract
Lithium sulfur (Li-S) battery is considered as one of promising energy-storage devices owing to its high energy density and low cost. However, it is still a great challenge to explore stable sulfur cathode with high sulfur loading and good cycling performance. Herein, we report a facile method to prepare N,S co-doped hierarchical pore structured carbon foam @porous carbon (CF@N-SPC) through a carbonation process from resin aerogel coated melamine foam with thiourea as the source for N and S codoping. The close combination of a carbon interconnected skeleton and the resin aerogel derived carbon forms the hierarchical pore structure that improves the electron and ion transport. The prepared CF@N-SPC can be used as a freestanding cathode without a conductive additive and a binder. Due to the synergistic effect of the hierarchical pore structure and N, S codoping, the sulfur loading in the carbon foam-based cathode can reach up to 10.6â¯mgâ¯cmâ2. Owing to these unique merits, the CF@N-SPC/S cathode exhibits high capacity and good cycling performance: it yields a discharge capacity of 1212â¯mAâ¯hâ¯gâ1 at 0.1â¯C with 4.0â¯mgâ¯cmâ2 sulfur loading; it also exhibits a good discharge capacity of 668â¯mAâ¯hâ¯gâ1 at 0.5â¯C when the sulfur loading increases to 10.6â¯mgâ¯cmâ2, capacity retained by 72% in 200 cycles; it experiences a very small capacity decay rate of 0.05% per cycle in 700 cycles at 1â¯C. Our rational design and facile synthesis of the carbon foam-based freestanding cathode is promising and applicable for development of high performance Li-S batteries.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
He Yang, Xu Zhang, Junling Guo, Weili Zhu, Shupeng Zhao, Fang Wang, Qiuyu Fan, Hongyan Xiao, Fengxiang Zhang,