Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10150403 | Electrochimica Acta | 2018 | 34 Pages |
Abstract
Lithium-sulfur (Li-S) battery is recognized as one of the most promising high-energy-density storage system. However, the poor cycle life and low sulfur utilization originating from the shuttling process involving lithium polysulfide (LiPSs) significantly hinder the practical application of Li-S battery. Various approaches have been introduced to retard the shuttle of LiPSs. Herein, a polar cobalt disulfide embedded in porous nitrogen doped carbon frameworks (CoS2-N-C) is synthesized from a single metal-organic framework ZIF-67. When used as a sulfur host for Li-S battery cathode, the CoS2-N-C frameworks can not only limit the dissolution of LiPSs by chemisorption, but also buffer the volume expansion during cycling. More importantly, the electrochemical reaction kinetics is greatly improved. As a result, the Li-S battery based on the S/CoS2-N-C electrode exhibits a high initial discharge capacity of 1288â¯mAh gâ1 at 0.2â¯C and a superior long cycle life for 500 cycles with a degradation rate as low as 0.064% per cycle at 1â¯C rate. Even with a high sulfur loading of 5.25â¯mgâ¯cmâ2, the battery still delivers a better cycle performance.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Shiqiang Luo, Chunman Zheng, Weiwei Sun, Yiqi Wang, Jianhuang Ke, QingPeng Guo, Shuangke Liu, Xiaobin Hong, Yujie Li, Wei Xie,