Journal
ELECTROCHIMICA ACTA
Volume 289, Issue -, Pages 94-103Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.09.048
Keywords
Lithium-sulfur battery; Porous carbon; Electrochemical polarization; Redox kinetics; Metal-organic framework
Categories
Funding
- National Natural Science Foundation of China [51702362]
- National Postdoctoral Program for Innovative Talents [BX201700103]
- China Postdoctoral Science Foundation [2018M633664]
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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 1288 mAh g(-1) at 0.2 C and a superior long cycle life for 500 cycles with a degradation rate as low as 0.064% per cycle at 1 C rate. Even with a high sulfur loading of 5.25 mg cm(-2), the battery still delivers a better cycle performance. (C) 2018 Elsevier Ltd. All rights reserved.
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