Isolated Fe-Co heteronuclear diatomic sites as efficient bifunctional catalysts for high-performance lithium-sulfur batteries

Xun Sun, Yue Qiu, Bo Jiang, Zhaoyu Chen, Chenghao Zhao, Hao Zhou, Li Yang, Lishuang Fan, Yu Zhang () and Naiqing Zhang ()
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Xun Sun: Harbin Institute of Technology
Yue Qiu: Harbin Institute of Technology
Bo Jiang: Harbin Institute of Technology
Zhaoyu Chen: Harbin Institute of Technology
Chenghao Zhao: Harbin Institute of Technology
Hao Zhou: Harbin Institute of Technology
Li Yang: Harbin Institute of Technology
Lishuang Fan: Harbin Institute of Technology
Yu Zhang: Harbin Institute of Technology
Naiqing Zhang: Harbin Institute of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The slow redox kinetics of polysulfides and the difficulties in decomposition of Li2S during the charge and discharge processes are two serious obstacles to the practical application of lithium-sulfur batteries. Herein, we construct the Fe-Co diatomic catalytic materials supported by hollow carbon spheres to achieve high-efficiency catalysis for the conversion of polysulfides and the decomposition of Li2S simultaneously. The Fe atom center is beneficial to accelerate the discharge reaction process, and the Co atom center is favorable for charging process. Theoretical calculations combined with experiments reveal that this excellent bifunctional catalytic activity originates from the diatomic synergy between Fe and Co atom. As a result, the assembled cells exhibit the high rate performance (the discharge specific capacity achieves 688 mAh g−1 at 5 C) and the excellent cycle stability (the capacity decay rate is 0.018% for 1000 cycles at 1 C).

Date: 2023
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DOI: 10.1038/s41467-022-35736-x

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