Journal
COMPOSITES COMMUNICATIONS
Volume 19, Issue -, Pages 239-245Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2020.04.015
Keywords
Lithium-sulfur battery; Polymer gel electrolyte; Coating composite cathode; Energy storage system
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Funding
- National Natural Science Foundation of China [21774053, 21975111, 51903123]
- Major Special Projects of Jiangxi Provincial Department of Science and Technology [20114ABF05100]
- Technology Plan Landing Project of Jiangxi Provincial Department of Education [GCJ2011-24]
- Natural Science Foundation of Jiangsu Province [BK20190760]
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Lithium-sulfur battery (LSB) has been considered as a promising energy storage technology owing to low production cost and high theoretical capacity. Unfortunately, the notorious shuttle effect phenomenon of polysulfides has greatly hindered its commercial applications. Herein, a coating composite cathode is fabricated via a facile phase separation approach, in which commercially available gel PVDF-HFP (poly(vinylidene fluoride-co-hexafluoropropylene)) electrolyte could be formed a thin and dense coating on sulfur cathode. Moreover, carbon nanotubes (CNTs) are employed as conducting skeleton to provide effective electron transfer pathway, which could ensure a long-term cycling life. By elaborately adjusting the concentration and thickness of gel electrolyte, coating composite cathodes with various surface morphologies are obtained. The optimized coating composite cathode with PVDF-HFP gel layer (5 wt%) exhibits a small capacity decay (0.179% per cycle) after 105 cycles at 0.5C, and an outstanding rate performance (408 mAh g(-1) at 2C), which holds a great potential for large-scale applications.
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