期刊
RSC ADVANCES
卷 5, 期 114, 页码 94479-94485出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra19348f
关键词
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资金
- State Key Laboratory of Catalytic Materials and Reaction Engineering (RIPP, SINOPEC)
- National Science Foundation of China [21373028]
- Major achievements Transformation Project for Central University in Beijing
- Ford University Research Program (URP) project
- Beijing Science and Technology Project
Lithium-sulfur (Li-S) batteries with high theoretical capacities and low cost are a strong candidate for future energy storage, but their development is hindered by many shortcomings, such as high-rate capacity decay due to the shuttle effect. Herein, we increase the capacity retention and cycle life of the Li-S battery through the addition of an interlayer made of polypyrrole (PPy)-treated carbon paper (CP) in a Li-S battery. We first quantitatively investigate the effect of the thickness of the carbon paper and then optimize a novel interlayer prepared by using PPy adhered to the carbon paper. The results show that 300 mu m CP is the best choice among the three thicknesses. The CP-300 samples deliver a reversible capacity of 490 mAh g(-1) after 200 cycles with a 0.5 C rate and show the best rate performance. Because of the porous structure and conductivity of the as-prepared PPy interlayer, the battery incorporating the PPy interlayer exhibits more excellent cycle performance and better rate performance than the CP batteries. Surprisingly, the PPy-coated CP-200 battery displays a reversible capacity of 555 mAh g(-1) after 200 cycles with a 0.5 C rate. This feasible way to modify a carbon paper interlayer may have promising prospects in the Li-S battery field.
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