Ether-compatible sulfurized polyacrylonitrile cathode with excellent performance enabled by fast kinetics via selenium doping

Xin Chen, Linfeng Peng, Lihui Wang, Jiaqiang Yang, Zhangxiang Hao, Jingwei Xiang, Kai Yuan, Yunhui Huang, Bin Shan, Lixia Yuan () and Jia Xie ()
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Xin Chen: Huazhong University of Science and Technology
Linfeng Peng: Huazhong University of Science and Technology
Lihui Wang: Huazhong University of Science and Technology
Jiaqiang Yang: Huazhong University of Science and Technology
Zhangxiang Hao: Huazhong University of Science and Technology
Jingwei Xiang: Huazhong University of Science and Technology
Kai Yuan: Huazhong University of Science and Technology
Yunhui Huang: Huazhong University of Science and Technology
Bin Shan: Huazhong University of Science and Technology
Lixia Yuan: Huazhong University of Science and Technology
Jia Xie: Huazhong University of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Sulfurized polyacrylonitrile is suggested to contain Sn (n ≤ 4) and shows good electrochemical performance in carbonate electrolytes for lithium sulfur batteries. However inferior results in ether electrolytes suggest that high solubility of Li2Sn (n ≤ 4) trumps the limited redox conversion, leading to dissolution and shuttling. Here, we introduce a small amount of selenium in sulfurized polyacrylonitrile to accelerate the redox conversion, delivering excellent performance in both carbonate and ether electrolytes, including high reversible capacity (1300 mA h g−1 at 0.2 A g−1), 84% active material utilization and high rate (capacity up to 900 mA h g−1 at 10 A g−1). These cathodes can undergo 800 cycles with nearly 100% Coulombic efficiency and ultralow 0.029% capacity decay per cycle. Polysulfide dissolution is successfully suppressed by enhanced reaction kinetics. This work demonstrates an ether compatible sulfur cathode involving intermediate Li2Sn (n ≤ 4), attractive rate and cycling performance, and a promising solution towards applicable lithium-sulfur batteries.

Date: 2019
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DOI: 10.1038/s41467-019-08818-6

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