期刊
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
卷 14, 期 6, 页码 976-987出版社
SPRINGER
DOI: 10.1007/s11705-019-1897-x
关键词
sulfur cathode; kombucha SCOBY; graphene oxide; polyacrylonitrile; lithium-sulfur battery
资金
- DST-SERB, New Delhi under the Physical sciences [EMR/2016/006302]
- Department of Science and Technology (DST), BSR of University Grants Commission (UGC), New Delhi, Government of India
- Ministry of Human Resource Development RUSA-Phase 2.0 grant, Department of Education, Government of India [F-24-51/2014 U Policy]
Hierarchically-porous carbon nano sheets were prepared as a conductive additive for sulfur/polyacrylonitrile (S/PAN) composite cathodes using a simple heat treatment. In this study, kombucha (that was derived from symbiotic culture of bacteria and yeast) carbon (KC) and graphene oxide (GO) were used as a carbon host matrix. These rational-designed S/PAN/KC/GO hybrid composites greatly suppress the diffusion of polysulfides by providing strong physical and chemical adsorption. The cathode delivered an initial discharge capacity of 1652 mAh center dot g-1 at a 0.1 C rate and a 100(th) cycle capacity of 1193 mAh center dot g-1. The nano sheets with embedded hierarchical pores create a conductive network that provide effective electron transfer and fast electrochemical kinetics. Further, the nitrogen component of PAN can raise the affinity/interaction of the carbon host with lithium polysulfides, supporting the cyclic performance. The results exploit the cumulative contribution of both the conductive carbon matrix and PAN in the enhanced performance of the positive electrode.
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