Journal
CHEMICAL ENGINEERING JOURNAL
Volume 404, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126462
Keywords
Iron sulfide; Eco-friendly; Cathode host; Lithium-sulfur batteries
Categories
Funding
- National Thousand Youth Talents program of China
- Ningbo 3315 program
- Zhejiang National Science Foundation for Distinguished Young Scholars
- China Postdoctoral Science Foundation [2019M652155]
- HEC Pakistan [2017/HEC/NRPU-10482]
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In this study, an economical, efficient, and green FeS/N-C sulfur host material has been successfully synthesized. It avoids the use of hazardous heavy metals, reduces costs, and achieves extraordinary electrochemical performance with high sulfiphility.
As the vital component affecting the performance of lithium-sulfur (Li-S) battery, the cathode host materials are of great importance. In order to pursue the high sulfiphility to obtain good performance, vast environmentally hazardous heavy metals were introduced, increasing the production costs and hindering Li-S battery real application to a certain extent. Along with performance, cost and environmental safety are keys but neglected point, for scalable fabrication of Li-S batteries host material. Here, an economical, efficient yet green adsorbent N-doped carbon-coated iron sulfide (abbreviated as FeS/N-C) has been synthesized via a simple pyrolysis approach. The achieved FeS/N-C exhibits rich element doping of nitrogen and uniform nanosheet morphology, self assembling into stable nanoflower structures. As a sulfur host, the FeS/N-C not only avoids the introduction of the precarious heavy metals, reduces costs but also presents high sulfiphility to achieve extraordinary electrochemical performance. With a sulfur content of 70.8 wt%, the FeS/N-C based sulfur electrodes deliver a high reversible capacity of about 729 mA h/g at 0.5 C after 500 cycles, with the degradation of 0.013% per cycle. Even at a higher rate of 2.0 C, a reversible capacity of 438 mA h/g still remains after 1000cycles. This green and highly efficient host material provides cost-effective solution to large-scale commercial applications of Li-S battery.
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