期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-019-08818-6
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资金
- National Basic Research Program of China (973 Program) [2015CB258400]
- National Science Foundation of China [21773077, 51532005]
- Program for HUST Interdisciplinary Innovation Team [2015ZDTD021]
Sulfurized polyacrylonitrile is suggested to contain S-n (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.
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